2022
DOI: 10.1021/acs.est.1c07894
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Amino Acid Configuration Affects Volatile Fatty Acid Production during Proteinaceous Waste Valorization: Chemotaxis, Quorum Sensing, and Metabolism

Abstract: During proteinaceous waste valorization to produce volatile fatty acids (VFAs), protein needs to be hydrolyzed to amino acids (AAs), but the effects of the configuration of AAs on their biotransformation and VFA production have not been investigated. In this study, more residual d-AAs than their corresponding l-AAs were observed after VFAs were produced from kitchen waste in a pilot-scale bioreactor. For all AAs investigated, the VFA production from d-AAs was lower than that from corresponding l-AAs. The metag… Show more

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Cited by 17 publications
(7 citation statements)
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“…It has also been shown that methionine supplementation had a positive effect on the fermentation rate of NDF in the rumen of heifers, which facilitated the utilization of cellulose by the animals [ 24 ]. Protein and peptide nutrients in feed are not only the main way for animals to take in amino acids, but also the only way for rumen microorganisms to obtain amino acids and different animals have different levels of need for different amino acids [ 25 , 26 ], while microorganisms also have certain preferences for amino acid utilization [ 27 , 28 ]. We believe that methionine supplementation promoted the reproduction and function of some cellulose-degrading bacteria, so the role of methionine on rumen microorganisms and the mechanism of action will be further explored in subsequent studies to clarify the interaction between methionine, microbial metabolism and host development.…”
Section: Discussionmentioning
confidence: 99%
“…It has also been shown that methionine supplementation had a positive effect on the fermentation rate of NDF in the rumen of heifers, which facilitated the utilization of cellulose by the animals [ 24 ]. Protein and peptide nutrients in feed are not only the main way for animals to take in amino acids, but also the only way for rumen microorganisms to obtain amino acids and different animals have different levels of need for different amino acids [ 25 , 26 ], while microorganisms also have certain preferences for amino acid utilization [ 27 , 28 ]. We believe that methionine supplementation promoted the reproduction and function of some cellulose-degrading bacteria, so the role of methionine on rumen microorganisms and the mechanism of action will be further explored in subsequent studies to clarify the interaction between methionine, microbial metabolism and host development.…”
Section: Discussionmentioning
confidence: 99%
“…Proteins and carbohydrates are the two main organic substrates used in the anaerobic fermentation process. Prior to their conversion into SCFAs, these compounds were first released from the solid phase and solubilized into the liquid phase Figure S3 shows the variation of soluble protein and carbohydrate concentrations at different capsaicin dosages.…”
Section: Resultsmentioning
confidence: 99%
“…Prior to their conversion into SCFAs, these compounds were first released from the solid phase and solubilized into the liquid phase. 29 Figure S3 shows the variation of soluble protein and carbohydrate concentrations at different capsaicin dosages. When the capsaicin dosage increased from 0 to 64 mg/g VS, the concentration of proteins enhanced from 1592.3 Ā± 80.1 to 2007.7 Ā± 95.6 mg of COD/L.…”
Section: Contribution Of Capsaicin Degradation To Scfa Productionmentioning
confidence: 99%
“…For P. freudenreichii, the expression of DPP (peptide transporters) and the general secretory (Sec) system, which were reported to be positive indicators of biofilm formation involved in quorum sensing, āˆ’ was higher in the coculture system than that of the sole culture one, suggesting that biofilm formation was triggered by P. freudenreichii.…”
Section: Resultsmentioning
confidence: 99%