Bangladesh Agricultural University
Question
Asked 20th Oct, 2017
How can I calculate the total phenolic content of my sample (Plant Extract)?
Can anyone help me step wise calculation for determination of total phenolic contents in Plant extracts?
Given the following:
5mg/50ml (5mg plant extract was dissolved in 50ml Methanol) and 300 ul (microliter) was taken for analysis.
Absorbance of sample at 760 nm = 0.541
Standards curve provided the following information: y=0.0109x- 0.022; R2 = 0.9995.
Thanks.
Most recent answer
How do you extract plant sample for phenolic compound determination? Would you please provide me the complete protocol of TPC determination?
1 Recommendation
All Answers (6)
Government College University, Lahore
It is quite simple, let me clarify you,
Just follow your calibration curve (is it in ug of gallic acid/mL), if so "x" would give you the microgram of gallic acid equivalent per ml of your solution, now multiply this with 50 (this give you microgram of TPC/5mg of your plant extract. Now just see an appropriate unit (may be mg/g of extract or ug/g of extract or others), One more thing if you want to express your result per gram of plant powder the above answer with yield and divide by amount of plant material processed. Best of luck.
for further consultation
DOI: 10.1007/s13197-014-1562-9
1 Recommendation
Albaha University
Dear Sir. Concerning your issue about the calculation for the determination of the total phenolic content (TPC) in Plant Extract.
First you need to use equation y=0.0109x- 0.022 to calculate the value of x
Where y = Absorbance
x = concentration from the calibration curve
This implies that x = 0.541 + 0.022/0.0109
x = 51.65 mg/mL
Therefore, TPC can be calculated as follows
TPC = cV/m
Where c= concentration from calibration curve
V= Volume of the extract used
m= Mass of the extract used
Therefore, TPC = cV/m
TPC = 51.65x50/5.0
TPC = 516.5 mg /g
May I know the type of standard and its concentration. I think the following below links may help you in your analysis:
Thanks
2 Recommendations
Albaha University
Dear Hammad Saleem
So according to the mentioned above the answer should be:
TPC = 516.5 mgGAE/g
Regards,
Government College University, Lahore
Dear Hammad Salem and Isam Eldin
Let me clarify one more thing you cannot estimate phenolic content following a single concentration of gallic acid as you are discussing here. In fact you have plotted a calibration curve so the unit of "X" would be as same as were present on the x-axis it may be mg/mL or ug/mL so having clear understanding is more important for correct calculation. Otherwise like many people do you may get 1025 mg GAE/g (A none sense) in an other sample. may be you have already faced same. I just mean to say double check and follow you calibration curve
Similar questions and discussions
Related Publications
Objective: Salicornia brachiata is a euhalopytic plant belonging to the family Chenopodiaceae. The present study investigates the phytochemistry, characterization and antibacterial activity of methanolic extract of S. brachiata.
Methods: S. brachiata was collected from the back waters of Chennai, Tamil Nadu. The collected plant material was shade d...
The prolonged exposure of the skin to sun radiation can have
undesired consequences, resulting in skin damage and darkening.
Plant extracts that can offer protection to the skin are important in
skin rehabilitation. Therefore, the aim of the study was to test plant
extracts for their phytochemical potential and cosmetic importance. Extracts of 15 m...
The theoretical basis of migration of zones under conditions of stepwise gradient development is discussed. Depending on the relationships between retention and eluent composition, zone migration can be simulated by use of computer software which finds the gradient program corresponding to the optimum positions of the spots on the final chromatogra...