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Antibacterial and antioxidant activities of endophytic fungi extracts of medicinal plants from Central Sulawesi

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  • National Innovation and Research Agency
  • National Research and Innovation Agency (BRIN), Indonesia

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Endophytic fungi are a group of fungi which grow inside the plant tissues without causing negative symptoms to the host plant and are able to produce biologically active substances. This research was carried out to evaluate the antibacterial and antioxidant activity of 40 endophytic fungi isolated from 10 species of medicinal plants collected from Palolo, Central Sulawesi. Thin layer chromatography (TLC) bioautography guided screenings were done to evaluate antibacterial and antioxidant activities. The antibacterial activity was done against Staphylococcus aureus InaCC-B5 and Escherichia coli InaCC-B4, while antioxidant activity was assessed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. Minimum inhibitory concentrations (MICs) of active extracts were further evaluated against these bacteria, while half-maximal inhibitory concentration (IC 50) of active extracts was determined by the microdilution broth method. The results of TLC bioautography screening showed 30 extracts inhibited the growth of S. aureus, 29 extracts inhibited the growth of E. coli, 27 extracts inhibited both S. aureus and E. coli, and 23 extracts posessed antioxidant activity. There were six extracts with MIC value of <100 µg/ml against S. aureus and nine extracts with MIC value of <100 µg/ml against E. coli. Six extracts indicated very strong antioxidant activity.
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Journal of Applied Pharmaceutical Science Vol. 8(08), pp 069-074, August, 2018
Available online at http://www.japsonline.com
DOI: 10.7324/JAPS.2018.8811
ISSN 2231-3354
© 2018 Praptiwi et al. This is an open access article distributed under the terms of the Creative Commons Attribution License -NonCommercial-
ShareAlikeUnported License (http://creativecommons.org/licenses/by-nc-sa/3.0/).
*Corresponding Author
Andria Agusta; Natural Product Chemistry Laboratory, Reseach Center
for Biology, Indonesian Institute of Sciences. Jl. Raya Bogor Km. 46,
Cibinong 16911, Indonesia. E-mail: andr002 @ lipi.go.id
Antibacterial and antioxidant activities of endophytic fungi extracts
of medicinal plants from Central Sulawesi
Praptiwi, Marlin Raunsai, Dewi Wulansari, Ahmad Fathoni, Andria Agusta*
Natural Product Chemistry Laboratory, Reseach Center for Biology, Indonesian Institute of Sciences, Jl. Raya Bogor Km. 46, Cibinong 16911, Indonesia.
ARTICLE INFO ABSTRACT
Article history:
Received on: 09/12/2017
Accepted on: 08/02/2018
Available online: 31/08/2018
Endophytic fungi are a group of fungi which grow inside the plant tissues without causing negative symptoms to
the host plant and are able to produce biologically active substances. This research was carried out to evaluate the
antibacterial and antioxidant activity of 40 endophytic fungi isolated from 10 species of medicinal plants collected
from Palolo, Central Sulawesi. Thin layer chromatography (TLC) bioautography guided screenings were done to
evaluate antibacterial and antioxidant activities. The antibacterial activity was done against Staphylococcus aureus
InaCC-B5 and Escherichia coli InaCC-B4, while antioxidant activity was assessed by 2,2-diphenyl-1-picrylhydrazyl
(DPPH) method. Minimum inhibitory concentrations (MICs) of active extracts were further evaluated against these
bacteria, while half-maximal inhibitory concentration (IC50) of active extracts was determined by the microdilution
broth method. The results of TLC bioautography screening showed 30 extracts inhibited the growth of S. aureus,
29 extracts inhibited the growth of E. coli, 27 extracts inhibited both S. aureus and E. coli, and 23 extracts posessed
antioxidant activity. There were six extracts with MIC value of <100 µg/ml against S. aureus and nine extracts with
MIC value of <100 µg/ml against E. coli. Six extracts indicated very strong antioxidant activity.
Key words:
antibacterial, antioxidant,
endophytic fungi,
bioautography.
INTRODUCTION
Endophytic fungi are groups of fungi with very
specic ecosystem inside plant tissues and produces varieties of
secondary metabolites (Agusta, 2009). Secondary metabolites
from endophytic fungi show important biological activities
such as antioxidant, anticancer, immunomodulatory, antivirus,
antituberculosis, anti-parasite and insecticides (Hussain et al.,
2014). Endophytic fungi produce secondary metabolites similar to
the host plant; therefore, endophytic fungi can be used as a source
of producing active metabolites and leads in drug developments
(Strobel, 2003; Owen and Hundley, 2004). The study on the
isolation and evaluation of bioactivities of endophytic fungi from
medicinal plants are increasing lately.
On the other hand, antimicrobial resistance has been
a major concern in the health care system globally (Ferri et
al., 2017). Discovery of novel and active metabolites against
pathogenic microbes as well as to overcome antimicrobial
resistance become very important. In addition to health problems
with increasing resistance, there is also a growing tendency to
search natural antioxidants to overcome degenerative disease
problems. Reactive oxygen species (ROS) are by-products of
biological reactions that cause oxidative damage to biomolecules
and play vital roles in programmed cell death (Cui et al., 2015).
To overcome the negative effect of excessive ROS in human body,
exogenous antioxidant is required. The main characteristic of
antioxidant compounds is the ability to capture and stabilize free
radicals (Prakash et al., 2011), inhibit or delay the occurrence of
free radical reactions due to the presence of relative oxygen; these
properties become important in the prevention of various diseases,
such as cancer and coronary heart disease (Leong and Shui, 2002).
Medicinal plants are reported as host of some endophytic
fungi that are involved in the co-production of active metabolites
(Alvin et al., 2014). The study conducted by Ilyas (2009); Praptiwi
et al. (2010); Praptiwi et al. (2015) showed that endophytic fungi
isolated from medicinal plants such as gambier (Uncaria gambier),
cinnamon (Cinnamomum burmannii) dan Zingiberaceous plants
have antioxidant and/or antibacterial activity.
Praptiwi et al. / Journal of Applied Pharmaceutical Science 8 (08); 2018: 069-074070
Khiralla et al. (2015) has identied and classied 21
endophytic fungi from ve medicinal plants of Sudan origin
and some contain phenol compounds that have the potential as
antioxidant natural sources. The present study aims to isolate and
evaluate the antibacterial and antioxidant activity of endophytic
fungi from ten species of medicinal plants originating from Palolo.
MATERIAL AND METHODS
Material
10 species of plants belonging to seven families which
are Urticaceae (Villebrunea rebescens (Blume), Poikilospermum
suaveolens (Blume) Merr.), Euphorbiaceae (Euphorbia
heterophylla L., Acalypha caturus Blume), Asteraceae (Blumea
balsamifera (L.) DC.), Zingiberaceae, Piperaceae (Piper peltatum
L.), Lamiaceae (Plectranthus scutellarioides (L.) R. Br), and
Verbenaceae (Cleodendron fragrans Wild.) were collected from
Palolo, Central Sulawesi. Identication of the plant specimens
were done at Herbarium Bogoriense, Research Center for Biology-
Indonesian Institute of Sciences.
Isolation of endophytic fungi
Leaves, stems, and rhizomes collected from the eld
were stored at low temperature. After arriving in the laboratory,
these samples were cleaned under tap water and immersed in 70%
ethanol for 1 minutes, then immersed in 5.3% Na-hypochlorite for
5 minutes and nally immersed in 70% ethanol for 30 seconds.
Samples were dried under aseptic conditions. The sterilized
samples were cut aseptically into small pieces (1 × 1 cm2), and
then, placed on top of the Corn Meal Malt Agar (CMMA) growth
medium added with chloramphenicol 0.05 mg/ml, and incubated
at room temperature for 1 week. The emerging colonies were
subcultured several times on Potato dextrose agar (PDA) to obtain
pure isolates.
Secondary metabolites extraction from endophytic fungi
Pure isolate of endophytic fungi was cultured on broth
medium [Potato dextrose broth (PDB)] (200 ml) and incubated in
dark condition, at room temperature for 3 weeks. After incubation
period is completed, growth media and endophytic fungi biomass
were extracted three times with ethyl acetate. The extract was
evaporated by rotary evaporation and the concentrated extract was
stored in the glass vial.
Chemical compounds analysis by Thin Layer
Chromatography (TLC)
The analysis of chemical compounds of endophytic fungi
extracts were performed on silica gel thin layer chromatography
(TLC) plates (silica gel GF254, Merck). The dried extract was
prepared in 10 mg/ml. 10 µl of extract was transferred on TLC
plate and developed in CH2Cl2:MeOH (10:1). Separated chemical
compounds were visualized under 254 nm and 366 nm ultraviolet
(UV) light followed by spraying with spray reagent 1% Ce(SO4)2
and 1% vanillin sulphuric acid.
Detection of antibacterial activity by TLC-bioautography
TLC-bioautography guided screening was performed to
evaluate the antibacterial potency of endophytic fungal extracts.
10 µl of extract was transferred on TLC plate and dried. Plate was
then dipped into bacterial suspension, followed by incubating the
plate under humid condition for 18 hours at 37°C. After incubation
was completed, plates were sprayed with iodonitrotetrazolium
p-violet (INT, Sigma). Growth inhibition of bacteria was observed
by clear zone formation around the extract. The active extracts
were further analyzed by developing the extract with mobile
phase CH2Cl2:MeOH (10:1). The plate was dried and sprayed with
iodonitrotetrazolium p-violet (INT, Sigma).
Detection of antioxidant activity by TLC-bioautography
10 µl of extract was transferred on TLC plate and
catechin used as positive control was also transferred on the
TLC plate. The plate was dried and sprayed with 0.02% DPPH
in methanol. Yellow spot on purple background indicated the
antioxidant activity. The active extract was developed with
CH2Cl2:MeOH (10:1). After drying, plate was sprayed with 0.02%
DPPH in MeOH.
Determination of minimum inhibitory concentration
The minimum inhibitory concentration (MIC) of active
extracts were determined by serial microdilution in 96-well
microplate (Pessini et al., 2003). The wells in column A were
lled with 100 μl of Mueller-Hinton Broth (MHB) medium and
100 µl stock solution of extract (1024 µg/ml) and homogenized.
Columns B through H were lled with 100 µl of MHB. A serial
dilution was carried out with corresponding nal concentration
(256 µg/ml). The test was done in triplicate. After the dilution
process, each well was added with 100 μl of bacterial suspension
(106 cfu/ml). In similar way, it was done with the positive control
of chloramphenicol, growth media as negative control. Microtiter
plate sealed with paralm and incubated at 37°C for 24 hours.
After incubation was completed, each well was added with 10
µl INT 4 mg/ml. The MIC was the lowest concentration showing
clear wells that indicate the absence of bacterial growth.
Determination of IC50 of active extract
The IC50 of the extract was determined by serial
microdilution in 96-well microplate by Takao et al. (2015) with
minor modication. The wells in column A were lled with 195 μl
MeOH and 5 µl extract (10240 µg/ml) and homogenized. Columns
B through H were lled with 100 µl of MeOH. A serial dilution
was carried out with corresponding concentration (256 µg/ml).
After the dilution process completed, each well was added with
100 μl of DPPH (61.50 µg/ml). Methanol was used as negative
control, while catechin was used as positive control. Microplates
were incubated in dark condition at room temperature for 90
minutes. The absorbances of the samples were measured at 517
nm. Antioxidant activity index (AAI) was calculated as follows:
AAI = nal concentration of DPPH in the reaction/IC50
IC50: the concentration of 50% inhibition was calculated by linear
regression equation.
RESULT AND DISCUSSION
A total of 40 isolates of endophytic fungi recovered
from 10 species of medicinal plants collected from Palolo, Central
Sulawesi. The results in Table 1 show that a plant part is colonized
Praptiwi et al. / Journal of Applied Pharmaceutical Science 8 (08); 2018: 069-074 071
by more than one endophytic fungus and different plant parts
might have different composition of endophytic fungi community.
This nding is in accordance with Zabalgogeazcoa (2008) that one
species of plant inhabited by more than one endophytic fungus.
Previous reports by Huang et al. (2008) and Ilyas (2009) showed
similar results that one species of plant inhabited by various
endophytic fungi. The distribution, composition, and population
structure of endophytic fungi rely largely on the taxonomy,
genetic background, age, and tissues of the host plants, and the
types of environments (Sieber, 2007; Jia et al., 2016). Older plant
parts may be colonized by higher number of endophytes than the
younger ones (Zabalgogeazcoa, 2008).
Table 1: MIC of endophytic fungi extracts isolated from plants collected from Palolo, Central Sulawesi.
No Sample
MIC (ug/ml)
No Sample
MIC (ug/ml)
S. aureus E. coli S. aureus E. coli
1 PAL-01B1 64 64 21 PAL-09D2 NT 256
2 PAL-01B2 32 32 22 PAL-10B1 128 256
3 PAL-01D1 NT NT 23 PAL-10B2 256 128
4 PAL-01D2 NT 256 24 PAL-10B3 128 8
5 PAL-02D1 128 256 25 PAL-10D1 256 64
6 PAL-02D2 256 NT 26 PAL-10D3 256 128
7 PAL-03B1 64 32 27 PAL-10D8 NT NT
8 PAL-03B2 256 128 28 PAL-11B1 NT 256
9 PAL-03B3 128 256 29 PAL-11B2 NT NT
10 PAL-03D1 256 64 30 PAL-11B3 128 NT
11 PAL-03D2 256 256 31 PAL-11D1 64 256
12 PAL-04R1 256 256 32 PAL-11D2 256 256
13 PAL-04R2 128 128 33 PAL-14D1 64 128
14 PAL-07B1 8 8 34 PAL-14D2 128 8
15 PAL-07B2 128 64 35 PAL-14D3 256 64
16 PAL-07D1 256 128 36 PAL-15B1 256 128
17 PAL-09B1 256 NT 37 PAL-15B2 NT NT
18 PAL-09B2 128 256 38 PAL-15D1 NT 256
19 PAL-09B3 NT NT 39 PAL-15D2 NT NT
20 PAL-09D1 NT NT 40 PAL-15D3 NT NT
Analysis of the chemical compounds of the extract
The chemical compounds of the endophytic fungi were
analyzed by TLC in order to separate the chemical compounds
within the extract. TLC is an important method for qualitative
and quantitative analysis of drugs and has several advantages
compared to HPLC and GC methods (Pyka, 2014). The plates
were sprayed with color reagents (vanillin reagent and cerium
reagent) to detect compounds in extract.
Observations under 254 nm showed different chemical
compounds in each extract which emitted green and dark-colored
compounds. A substance having a maximum wavelength (λmax) of
250–260 nm may contain aromatic groups such as aromatic amino
acid, simple phenol, and purines or pyrimidines (Harborne, 1973).
Observation under 366 nm showed that TLC plates as background
emitted purple and spot dark-colored chemical compounds.
Substances having λmax 200–400 nm indicated the presence of
compounds has an aromatic group or a conjugated double bond
(Fried and Sherma, 1999). TLC plates sprayed with vanillin and
cerium showed the presence of different chemical compounds in
extract that was characterized by stain spots with multiple colors.
Crude extract of endophyic fungi (Figure 1) contained several
chemical compounds indicated by several spots with different Rf.
These chemical compounds might have biological activities and
mixture of chemical compounds in crude extract may increase the
potential of the active component to produce additive or synergistic
effects, while others may be neutral or inhibit (Dhankhar et al.,
2012).
Antibacterial activity detection by TLC
Antibacterial screening of endophytic fungi extracts
was done by TLC method. TLC method is nest, rapid, efcient,
and uncomplicated method (Masoko and Ellof, 2006; Shahverdi
et al., 2007), requires small amount of test sample and simple
interpretation of results (Valle Jr. et al., 2016). TLC dot-blot direct
bioautography of antibacterial activity screening shown in Figure
2. The results of antibacterial screening of 40 endophytic fungi
extracts showed that 30 extracts inhibited the growth of S. aureus,
29 extracts inhibited the growth of E. coli and 27 extracts were
able to inhibit S. aureus as well as E. coli. The growth inhibition
of bacteria was indicated by clear zone formation on TLC against
a purple background (Das et al., 2010). The purple colour on TLC
plate after spraying with INT was resulted from the conversion of
INT to intensely colored formazan by the dehydrogenases enzyme
of living microorganisms (Silva et al., 2005). Shahverdi et al.
(2007) also stated that INT interacted with viable microorganisms
caused a colour change of INT to red-purple one. Screening
antibacterial activity by TLC dot-blot is simple and time saving
method; however, the component mixtures in the crude extract
Praptiwi et al. / Journal of Applied Pharmaceutical Science 8 (08); 2018: 069-074072
can have synergistic or antagonistic effects (Choma and Jesionek,
2015). The active extracts developed with mobile phase to separate
the bioactive compounds in the extract (Figure 3). Separated
bioactive compounds with antibacterial properties indicated by
white band formation.
Fig. 1: Chromatograms of endophytic fungal extracts developed in dichloromethane-methanol (10:1 v/v), (a) viewed under 254 nm wavelength, (b) viewed under 366
nm wavelength, (c) sprayed with vanillin reagent, (d) sprayed with cerium reagent.
Fig. 2: TLC dot-blot assay for antibacterial activity of endophytic fungi against
E. coli (top) and S. aureus (bottom).
Fig. 3: Bioautograms of endophytic fungi against E. coli (top) and S. aureus
(bottom). The TLC plates were developed in dichloromethane:methanol (10:1
v/v). Clear bands indicated antibacterial activity.
The minimum inhibitory concentration (MIC) of active
extracts was assessed against E. coli and S. aureus. The result in
Table 1 showed that MIC values of PAL endophytic fungi extracts
ranging from 8 to 256 µg/ml. MIC in the range of 100–1000 µg/
ml could be classied as antimicrobial (Borges et al., 2012). The
MIC of several endophytic fungi were <100 µg/ml. According to
Pessini et al. (2003), the MIC value of extract <100 µg/ml was
classsied as good antibacterial activity, while extracts with MIC
value ranging from 100 µg/ml to 500 µg/ml classied as moderate
activity. Among 40 endophytic fungi tested for antibacterial
activity, endophytic fungus PAL-07B1 derived from Piper
peltatum, has good antibacterial activity against S. aureus and
E. coli, with equivalent MIC for both isolates (8 µg/ml). Several
previous studies reported the antibacterial activity of ethyl acetate
extracts of endophytic fungi isolated from Piper (Orlandelli et al.,
2012; Astuti et al., 2014). This result suggested the endophytic
fungus PAL-07-B1 contains potential bioactive compounds as
antibacterial.
Antioxidant activity by TLC-bioautography
The antioxidant activity of extracts was done by DPPH
free radical scavenging activity. DPPH radical when receiving an
electron from antioxidant compound would be reduced to DPPH.
The violet color of DPPH radical turned into yellow (Pavithra and
Vadivukkarasi, 2015). Screening for antioxidant activity by dot-
blot TLC (Figure 4) showed 23 extracts had antioxidant activity.
Antioxidant activity is indicated by the color change to yellow
against a purple background (Dewanjee et al., 2015). The intensity
of yellow color indicates the antioxidant capacity. Further analysis
of active extract was shown in Figure 5.
The developed TLC-bioautography of endophytic fungi
extracts (Figure 5) showed several compounds possess antioxidant
activity within extract. This is indicated by the formation of
Praptiwi et al. / Journal of Applied Pharmaceutical Science 8 (08); 2018: 069-074 073
yellowish white bands. Further analysis of active antioxidant
extracts is to determine its IC50 value (Table 2).
Fig. 4: TLC dot-blot assay for antioxidant activity of endophytic fungi extracts
isolated from medicinal plants from Central Sulawesi.
Fig. 5: TLC-bioautogram of antioxidant activity of endophytic fungi extracts.
The yellowish white band indicates the compounds with antioxidant activity.
Table 2: IC50 and antioxidant activity index (AAI) of endophytic fungi extracts.
No Sample IC50 (ug/ml) AAI value Criteria of AAI value
1 PAL-01B2 5.26 5.846 Very strong
2 PAL-01D2 7.84 3.922 Very strong
3 PAL-02D1 26.00 1.183 Strong
4 PAL-03D1 107.51 0.286 Moderate
5 PAL-04R1 52.70 0.583 Moderate
6 PAL-04R2 10.02 3.069 Very strong
7 PAL-07B2 77.60 0.396 Moderate
8 PAL-09B1 99.72 0.308 Moderate
9 PAL-11B1 10.03 3.066 Very strong
10 PAL-14D3 14.06 2.187 Very strong
11 PAL-15D1 43.15 0.713 Moderate
12 Catechin 1.71 17.982 Very strong
Based on the criteria of AAI value by Scherer and Godoy
(2009), there are ve extracts that displayed very strong antioxidant
activity (PAL 01-B2, PAL 01-D2 from Villebrunearubescens
(Urticaceae), PAL 04-R2 (Zingiberaceae), PAL 11-B1 from
Clerodendronfragrans (Verbenaceae), and PAL 14-D3 from
Acalyphacaturus (Euphorbiaceae); one extract displayed strong
antioxidant activity and ve extracts displayed moderate activity.
Previous study by Praptiwi et al. (2016) showed some endophytic
fungi isolated from Zingiberaceae had strong antioxidant activity,
while endophytic fungi from other studied plants had no previous
reports. The very strong antioxidant activity of extracts was related
to many bioactive compounds as antioxidant within extract may
act synergistically.
CONCLUSION
This study revealed the presence of bioactive secondary
metabolites produced by endophytic fungi from several medicinal
plants collected from Central Sulawesi with antibacterial and/or
antioxidant activity. Endophytic fungi PAL-01B2 and PAL-07B1
showed good antibacterial activity against S. aureus InaCC-B5
and E. coli InaCC-B4. Five endophytic fungi showed very strong
radical scavenging activity (PAL 01-B2, PAL 01-D2, PAL 04-R2,
PAL 11-B1), and PAL 14-D3. Further studies needed to isolate and
purify bioactive compounds, which is responsible for antibacterial
and antioxidant activity. These ndings indicated that endophytic
fungi from medicinal plants collected from Palolo, Central
Sulawesi could be potential for the development as pharmaceutical
agents.
ACKNOWLEDGEMENT
The authors are thankful to Research Center for Biology,
Indonesian Institute of Sciences for nancial support through
DIPA-Pusat PenelitianBiologi.
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How to cite this article:
Praptiwi, Raunsai M, Wulansari D, Fathoni A, Agusta A.
Antibacterial and antioxidant activities of endophytic fungi
extracts from medicinal plant from Central Sulawesi. J App
Pharm Sci, 2018; 8(08): 069-074.
... The active fraction of 30 ll was applied on TLC plates and were developed using the mobile phase (toluene, ethyl acetate, methanol, and acetic acid) in the ratio of 5:3:1:0.5. Finally, the bands were examined in a TLC chamber under a long wavelength (366 nm) and a short wavelength (254 nm) (Praptiwi et al., 2018). ...
... Mc-Farland standards) were swabbed thoroughly on respective petri plates and incubated for 24 h at 37 ℃. The clear zones were marked and were scrapped from reference TLC plates based on similar R f values (Praptiwi et al., 2018). ...
... On the other hand, natural products derived from endophytic fungi have various benefits in medicinal use, including anticandidal and antioxidants agents Praptiwi 2018;Wulansari et al. 2016;Fathoni et al. 2022a). In addition, endophytic fungi are also widely known as a storehouse of bioactive compounds useful in various fields including medicinal, pharmaceutical, agricultural, and industrial purposes (Gouda et al. 2016;Chutulo and Chalannavar 2018;Rana et al. 2020;Wen et al. 2022;Fathoni et al. 2022a). ...
... The previous study indicated a strong correlation between total phenolic with antioxidant capacity (Shrestha and Dhillion 2006). The bioactive compounds within the extract may have a synergistic action that causes vigorous activity for free radical scavenging as antioxidant agents (Praptiwi et al. 2018). ...
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Fathoni A, Hudiyono S, Cahyana AH, Ilyas M, Purnaningsih I, Agusta A. 2023. Anticandidal and antioxidant potencies of endophytic fungi associated with Tinospora crispa. Biodiversitas 24: 2547-2555. Natural products including endophytic fungi, have opportunities for medicinal uses as anticandidal and antioxidant agents. This study aimed to investigate the anticandidal and antioxidant activities of endophytic fungi isolated from Brotowali (Tinospora crispa (L.) Miers ex Hook.fil. & Thomson) using disc diffusion, thin layer chromatography (TLC) dot-blot, and microdilution methods. Eighty extracts were screened for anticandidal activity against Candida albicans (C.P.Robin) Berkhout and antioxidants against 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radicals. Disc diffusion results showed that 38 endophytic fungi had an anticandidal activity with an inhibition zone diameter (IZD) of 7.00±00 to 18.1± 0.29 mm and 4 extracts with minimum inhibitory concentration (MIC) values of 32-64 µg/mL (strong, MIC<100). The TLC dot-blot results showed that 23 extracts had antioxidant activity and 8 extracts were very strong with an inhibitory concentration of 50% (IC50) values of 7.76±0.77 to 25.54±1.37 µg/mL, while the antioxidant activity index (AAI) values ranged from 2.01±0.10 to 6.64±0.63 (very strong, AAI>2). Results of the Pearson correlations coefficient between the total phenolic content (TPC) value and AAI value, revealed that there was a low correlation, while the correlation of IZD and MIC as anticandidal has a moderate negative (the r value 0.332, and-0.673, respectively (P<0.01). Purification of bioactive compounds is necessary, and endophytic fungi associated with T. crispa can serve as a potential source of natural antioxidants and anticandidal agents.
... The termite nest samples were air-dried for five days, then pulverized, and filtered through a 2 mm mesh. Actinomycetes were isolated using the Sodium Dodecyl Sulphate-Yeast Extract (SDS-YE) (Praptiwi et al., 2019): a gram of soil particles was mixed with 9 ml of sterile aquadest, vortexed for 10 minutes, and 0.5 ml of this mixture was added to SDS-YE in a test tube. After another round of vortexing for 3 minutes, the suspension was incubated in a water bath shaker at 40°C for 20 minutes. ...
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Actinomycetes are an important source for the discovery of bioactive secondary metabolite compounds. Over 10,000 bioactive metabolite compounds have been isolated from terrestrial actinomycetes with various biological activities, such as antibiotic, antiviral, anti-inflammatory, antitumor, anticancer, and antioxidant. One source of origin for actinomycetes is soil, including termite nests. Utilization of natural sources such as actinomycetes from termite nests as antioxidants and antibacterials can be an alternative source of production of new secondary metabolite compounds. This research aims to evaluate the antioxidant and antibacterial activities of actinomycete extracts from termite nests. Antioxidant activity was observed using the DPPH free radical scavenging method, while antibacterial activity was measured by observing the growth inhibition of Staphylococcus aureus. Antioxidant and antibacterial activity were performed by using the TLC dot-blot, TLC bioautography, and microdilution methods to determine the inhibitory concentration of 50% (IC50), antioxidant activity index (AAI), and minimum inhibitory concentration (MIC). From the 33 extracts tested, 16 extracts showed antioxidant activity with IC50 values range of 76.64-126.22 µg/mL or AAI value > 0.05 (moderate), and 8 extracts had moderate antibacterial activity against S. aureus (MIC values range of 256-512 µg/mL). Future research for scaling up of actinomycete culture, isolating active compounds, determining the chemical structure of active compounds, and further testing as antioxidants and antibacterials still need to be carried out.
... Extracts (10 mg/mL) then were loaded onto silica gel GF 254 TLC aluminum plate (Merck, Darmstadt, Germany) and developed using dichloromethane and methanol (20:1). Spots were visualized using 1% Ce(SO 4 ) 2 in 10% H 2 SO 4 spray reagent (Praptiwi et al., 2018). ...
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Endophytic fungi living in medicinal plant tissues are potential bioactive metabolite sources for drug discovery and development. However, the research regarding endophytic fungi associated with Indonesian medicinal plants is still limited. This study aimed to explore the biodiversity of endophytic fungi associated with the medicinal plant Uncaria gambier(Hunter) Roxb. var. udang and their antibacterial activities. Twenty-seven endophytic filamentous fungi were isolated from the surface-sterilized leaves, stems, and roots of Uncaria gambier(Hunter) Roxb. var. udang collected in Jasinga, Bogor, West Java, Indonesia. The observation based on the morphological characters both macroscopically and microscopically, as well as chemical profiling using thin layer chromatography (TLC), revealed that some of the isolated endophytic fungi were identical. Overall, the isolated endophytic fungi consist of six Coelomycetes, three Dematiaceae, four Pestalotiopsis sp., two Penicillium sp., one Aspergillus terreusand two fungi were unidentified. Antibacterial activities of the ethyl acetate extract from the isolated endophytic fungi associated with Uncaria gambier(Hunter) Roxb. var. udang were observed against E. coli, B. subtilis, S. aureus, and M. luteus. Twelve types of isolated endophytic fungi from Uncaria gambier(Hunter) Roxb. var. udang exhibited antibacterial activities.
... However, numerous studies have demonstrated the ability of endophytic fungus from medicinal plants to combat microbes [17]. The MIC of endophytic fungi isolated from plants collected from Palolo, Central Sulawesi showed a MIC value of 256 µg/mL against E. coli and S. aureus [18]. The MIC of fungal endophytes isolated from the Garcinia plant species displayed the value of 512-2 µg/mL against S. aureus, C albicans, C neoformans, and M gypseum [19]. ...
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Endophytic fungi are a significant source of secondary metabolites, which are chemical compounds with biological activities. The present study emphasizes the first-time isolation and identification of such fungi and their pharmacological activities from the medicinal plant Cordia dichotoma, which is native to Jammu, India. The Shannon Wiener diversity index revealed a wide range of fungal endophytes in root (1.992), stem (1.645), and leaf (1.46) tissues. A total of 19 en-dophytic fungi belonging to nine different genera were isolated from this plant and the majority belonged to the Ascomycota phylum. ITS rRNA gene sequencing was used to identify the fungal strains and they were submitted in NCBI GenBank. The most potent fungal isolate Cladosporium cladosporioides OP870014 had strong antimicrobial, antioxidant, and anticancer activity against MCF-7, HCT-116, and PC-3 cancer cell lines. The LC-MS and GC-MS analyses of the ethyl acetate extract of C. cladosporioides were examined to identify the bioactive metabolites. The major compounds of the crude extract derived from C. cladosporioides OP870014, according to GC-MS, are spiculisporic acid; dibutyl phthalate; phenylethyl alcohol; cyclohexanone, 2,3,3-trimethyl-2-3-methylbutyl; pyrrolo[1,2-a]pyrazine-1,4-dione,hexahydro-3-(phenylmethyl);2,5-piperazinedione,3,6-bis(2-methylpropyl); and heneicosane which possessed antimicrobial, anticancerous, and antioxidant activities. The findings revealed that C. dichotoma has the capacity to host a wide variety of fungal endophytes and that secondary metabolites from the endophytic fungus may be a source of alternative naturally occurring antimicrobial, antioxidant, and cytotoxic compounds.
... Other endophytic species, such as Chaetomium sp., Colletotrichum sp., Curvularia sp., and Trichoderma sp., isolated from similar host plants, have also exhibited antioxidant activity ranging from 31 to 69% [137]. Five endophytic fungal isolates PAL 01-B2, PAL 01-D2, PAL 04-R2, PAL 11-B1, and PAL 14-D3 possessed strong antioxidant activities with IC 50 value ranging between 5.26 and 14.06 µg/mL, respectively [138]. Potential antioxidant properties were also demonstrated by endophytic Aspergillus sp., Alternaria sp. ...
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The seminal discovery of paclitaxel from endophytic fungus Taxomyces andreanae was a milestone in recognizing the immense potential of endophytic fungi as prolific producers of bioac-tive secondary metabolites of use in medicine, agriculture, and food industries. Following the discovery of paclitaxel, the research community has intensified efforts to harness endophytic fungi as putative producers of lead molecules with anticancer, anti-inflammatory, antimicrobial, antioxi-dant, cardio-protective, and immunomodulatory properties. Endophytic fungi have been a valuable source of bioactive compounds over the last three decades. Compounds such as taxol, podophyllo-toxin, huperzine, camptothecin, and resveratrol have been effectively isolated and characterized after extraction from endophytic fungi. These findings have expanded the applications of endophytic fungi in medicine and related fields. In the present review, we systematically compile and analyze several important compounds derived from endophytic fungi, encompassing the period from 2011 to 2022. Our systematic approach focuses on elucidating the origins of endophytic fungi, exploring the structural diversity and biological activities exhibited by these compounds, and giving special emphasis to the pharmacological activities and mechanism of action of certain compounds. We highlight the tremendous potential of endophytic fungi as alternate sources of bioactive metabolites, with implications for combating major global diseases. This underscores the significant role that fungi can play in the discovery and development of novel therapeutic agents that address the challenges posed by prevalent diseases worldwide.
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This research aims to optimize the production of antibacterial metabolites and test the antioxidant activity of endophytic isolates from kelakai (Stenochlaena palustris). The research results showed that the optimum growth profile of the isolate showed that exponential growth only started on day 1 and reached a maximum on day 17. Based on pH variations, it shows that pH 7 is the optimum pH in inhibiting bacterial growth, and based on variations in carbon sources, it shows that fructose is a better carbon source than glucose. Antimicrobial activity test using ethyl acetate extract from endophytic fungal fermentate based on differences in pH and carbon source showed antimicrobial activity against S. aureus and E. coli with the inhibition zone diameters being 13.50 mm and 11.35 mm, respectively.
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The leaves of Ficus benghalensis var. krishnae, a tree endemic to India, are known for their unique cup-shaped appearance and have been used in traditional medicine. The present study examines the antimicrobial activity of leaf extracts prepared in various solvents against four bacterial species, namely Bacillus subtilis, Escherichia coli, Salmonella typhimurium,, and Staphylococcus aureus. Minimum inhibitory concentration (MIC) values were determined using the tetrazolium microplate assay to quantitatively evaluate the antibacterial activity of the extracts. Diethyl ether extracts of F. benghalensis var. krishnae leaves exhibited the strongest antimicrobial activity against B. subtilis as compared with the standard drug ampicillin. Identification of the bioactive fraction in the leaf diethyl ether extract was performed using high-performance thin-layer chromatography (HPTLC)‒bioautography and analysis of separated fractions using high-resolution liquid chromatography (HR-LC) and mass spectrometry (MS). Our results revealed that the bioactive fractions of F. benghalensis var. krishnae plant contained 15 potential antimicrobial components. These components were then subjected to in silico absorption, distribution, metabolism, and excretion (ADME) and toxicological analysis, which narrowed them down to three lead compounds. Molecular docking was performed using the lead compounds against target proteins from B. subtilis as well as the pathogenic species, Bacillus anthracis, where 5,7,4′-tri-O-methylcatechin demonstrated its potential as an antimicrobial drug candidate.
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The continuous search for secondary metabolites in microorganisms isolated from untapped reservoirs is an effective prospective approach to drug discovery. In this study, an in-depth analysis was conducted to investigate the diversity of culturable bacterial endophytes present in the medicinal plant A. absinthium , as well as the antibacterial and anticancer potential of their bioactive secondary metabolites. The endophytic bacteria recovered from A. absinthium , were characterized via the implementation of suitable biochemical and molecular analyses. Agar well diffusion and broth microdilution were used to screen antibacterial activity. SEM was performed to assess the impact of the extracted metabolite on MRSA strain cell morphology. Apoptosis and cytotoxicity assays were used to evaluate anticancer activity against MCF7 and A549. The FTIR, GC–MS were used to detect bioactive compounds in the active solvent fraction. Of the various endophytic bacteria studied, P. aeruginosa SD01 showed discernible activity against both bacterial pathogens and malignancies. The crude ethyl acetate extract of P. aeruginosa SD01 showed MICs of 32 and 128 µg/mL for S. aureus and MRSA, respectively. SEM examination demonstrated MRSA bacterial cell lysis, hole development, and intracellular leaking. This study revealed that the crude bioactive secondary metabolite SD01 has potent anticancer activity. In this study, 2-aminoacetophenone, 1,2-apyrazine-1,4-dione, phenazine and 2-phenyl-4-cyanopyridine were the major bioactive secondary metabolites. In conclusion, our findings indicate that the bacteria recovered from A. absinthium plants and in particular, P. aeruginosa SD01 is a remarkable source of untapped therapeutic, i.e., antimicrobial and anticancer compounds.
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Natural product drug discovery has regained interest due to low production costs, structural diversity, and multiple uses of active compounds to treat various diseases. Attention has been directed towards medicinal plants as these plants have been traditionally used for generations to treat symptoms of numerous diseases. It is established that plants harbour microorganisms, collectively known as endophytes. Exploring the as-yet untapped natural products from the endophytes increases the chances of finding novel compounds. The concept of natural products targeting microbial pathogens has been applied to isolate novel antimycobacterial compounds, and the rapid development of drug-resistant Mycobacterium tuberculosis has significantly increased the need for new treatments against this pathogen. It remains important to continuously screen for novel compounds from natural sources, particularly from rarely encountered microorganisms, such as the endophytes. This review focuses on bioprospecting for polyketides and small peptides exhibiting antituberculosis activity, although current treatments against tuberculosis are described. It is established that natural products from these structure classes are often biosynthesised by microorganisms. Therefore it is hypothesised that some bioactive polyketides and peptides originally isolated from plants are in fact produced by their endophytes. This is of interest for further endophyte natural product investigations (Figure 1).
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An increase in the number of people in the world having health problems caused by certain cancers, drug-resistant bacteria, parasitic protozoans, and fungi has caused alarm. An intensive search for newer and more effective agents to deal with these problems is now underway. Endophytes are a potential source of novel chemistry and biology to assist in helping solve not only human health, but plant and animal health problems also. Endophytes reside in the tissues between living plant cells. The relationship that they establish with the plant varies from symbiotic to bordering on pathogenic. Of all of the world's plants, it seems that only a few grass species have had their complete complement of endophytes studied. As a result, the opportunity to find new and interesting endophytes among the myriad of plants is great. Sometimes extremely unusual and valuable organic substances are produced by these endophytes. These compounds may contribute to the host-microbe relationship. The initial step in dealing with endophytic microorganisms is their successful isolation from plant materials. Then, the isolation and characterization of bioactive substances from culture filtrates is done using bioassay guided fractionation and spectroscopic methods. Some of the more interesting compounds produced by endophytic microbes with which we have dealt are taxol, cryptocin, cryptocandin, jesterone, oocydin, isopestacin, the pseudomycins and ambuic acid. This review discusses an approach for bio-prospecting the rainforests, not only to harvest their endophytic microorganisms, but to eventually build a better understanding of the importance and value they have to humankind.
Biodiversity of endophytic fungi associated with
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Antibacterial Activity of Crude Extracts Produced by Endophytic Fungi Isolated from Piper hispidum
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