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The idea of components or energy recovery from bioprocesses waste or by-product. Descriptors: (1) fermentation, (2) hydrolysis, (3) pyrolysis, (4) outgasification, (5) combustion, (6) reforming (hydro-reforming), and (7) catalytic synthesis.
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Lactic acid is a naturally existing organic acid, which may be applied in many different branches of industrial application, for example cosmetics, pharmaceutics, chemicals, food, and nowadays also in medicine. It can be made in sugar fermentation process from renewable raw materials, which means, that is the ecological product that has enjoyed gre...
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BACKGROUND
Surfactin produced by microbial fermentation has attracted increasing attention because of its low toxicity and excellent antibacterial activity. However, its application is greatly limited by high production costs and low yield. Therefore, it is important to produce surfactin efficiently while reducing the cost. In this study, B. subtil...
Citations
... In addition, the strain may be suitable to be tested in dairy niches due to the presence of beta-galactosidase (lacZ) [42]. The use of glycerol as a growth substrate can be helpful from a biotechnological standpoint, as glycerol by-products have been investigated as a raw material to develop lactic acid [43]. EggNOG results showed that the UTNCys6-1 genome contains genes for the xylose activator XylR (xylA, xylB_1, and xylB_2) as well as enzymes and proteins for xylose and xylulose consumption. ...
Metabiotics are the structural components of probiotic bacteria, functional metabolites, and/or signaling molecules with numerous beneficial properties. A novel Lactococcus lactis strain, UTNCys6-1, was isolated from wild Amazonian camu-camu fruits (Myrciaria dubia), and various functional metabolites with antibacterial capacity were found. The genome size is 2,226,248 base pairs, and it contains 2248 genes, 2191 protein-coding genes (CDSs), 50 tRNAs, 6 rRNAs, 1 16S rRNA, 1 23S rRNA, and 1 tmRNA. The average GC content is 34.88%. In total, 2148 proteins have been mapped to the EggNOG database. The specific annotation consisted of four incomplete prophage regions, one CRISPR-Cas array, six genomic islands (GIs), four insertion sequences (ISs), and four regions of interest (AOI regions) spanning three classes of bacteriocins (enterolysin_A, nisin_Z, and sactipeptides). Based on pangenome analysis, there were 6932 gene clusters, of which 751 (core genes) were commonly observed within the 11 lactococcal strains. Among them, 3883 were sample-specific genes (cloud genes) and 2298 were shell genes, indicating high genetic diversity. A sucrose transporter of the SemiSWEET family (PTS system: phosphoenolpyruvate-dependent transport system) was detected in the genome of UTNCys6-1 but not the other 11 lactococcal strains. In addition, the metabolic profile, antimicrobial susceptibility, and inhibitory activity of both protein–peptide extract (PPE) and exopolysaccharides (EPSs) against several foodborne pathogens were assessed in vitro. Furthermore, UTNCys6-1 was predicted to be a non-human pathogen that was unable to tolerate all tested antibiotics except gentamicin; metabolized several substrates; and lacks virulence factors (VFs), genes related to the production of biogenic amines, and acquired antibiotic resistance genes (ARGs). Overall, this study highlighted the potential of this strain for producing bioactive metabolites (PPE and EPSs) for agri-food and pharmaceutical industry use.
... Lactic acid is naturally found in plant organisms, microbes, and animals; nonetheless, LA can also be generated either by chemical synthesis or by carbohydrate fermentation (Jodłowski and Strzelec, 2021;Komesu et al., 2017). The fermentation process outcompetes the chemical methods as the produced lactic acid is visually purer than the racemic mixture derived from the chemical process (Gao et al., 2011). ...
Lactic acid is a valuable compound used in several industrial processes such as polymers, emulsifiers manufacturing, pharmaceutical, and cosmetic formulations. The present study aims to evaluate the potential use of food waste to produce lactic acid through fermentation, both by indigenous microbiota and by the bio-augmentation with two lactic acid bacteria, namely Lactobacillus plantarum BS17 and Lactobacillus casei BP2. Fermentation was studied both in batch and continuously fed anaerobic reactors at mesophilic conditions and a Response Surface Methodology approach was used to optimize the bioprocess performance and determine the environmental parameters (namely pH and time) that lead to the enhancement of lactic acid production during the batch fermentation by indigenous microorganisms. Results revealed an optimum set of conditions for lactic acid production at a pH value of 6.5 and a fermentation period of 3.5 days at 37 °C. Under these conditions lactic acid production reached a value of 23.07 g/L, which was very similar to the mathematically predicted ones, thus verifying the accuracy of the experimental design. This optimum set of conditions was further employed to examine the production of lactic acid under continuous fermentation operation. Furthermore, concentrations of volatile fatty acids and ethanol were monitored and found to be relatively low, with ethanol being the dominant by-product of fermentation, indicating the presence of heterofermentative bacteria in the food wastes. A final step of downstream process was performed resulting in the successful recovery of lactic acid with purity over 90%.
... In order to create polymer composites with better environmental sustainability, biodegradable polymers are gradually gaining popularity for application in WPCs, due to their sustainability both in sourcing raw material and biodegradation [13]. Among the natural and synthetic biodegradable polymers, poly (lactic acid) (PLA) has the greatest commercial application [14,15]. On a similar basis to WPC, many powdered biomass fillers (including wood flour, cellulose, lignin flour, starch, and etc.) [16] are used to blend into PLA with the aim of overcoming one of the primary drawbacks of PLA [17,18], the price to performance ratio, in order to optimize its use in specific commercial applications. ...
Acrylic acid is an essential chemical and a vital intermediate used in the production of various commodities and industrial chemicals. However, continued reliance on petroleum-based feedstocks for the production of...
The physicochemical properties of plasma-activated water (PAW) generated under different process conditions were investigated, and their changes under different storage conditions were also studied. The results showed that increasing the processing time and power, and decreasing generated water volume could cause an increase in the redox potential, conductivity, and temperature of PAW, and a decrease in its pH. A slower dissipation of reactive oxygen and nitrogen species of PAW was found stored at 4°C in a sealed conical flask than that stored at room temperature. The inactivation ability of plasma-activated lactic acid to Listeria monocytogenes (L. monocytogenes) and Pseudomonas aeruginosa (P. aeruginosa) was higher than that of PAW or LA alone under the same experimental conditions. The results of this study may provide theoretical information for the application of PAW as a potential antimicrobial agent in future.
