Kinetics and mechanism of the monomeric products from abiotic hydrolysis of poly[(R)-3-hydroxybutyrate] under acidic and alkaline conditions

Biofloc Technology (BFT): A Review for Aquaculture Application and Animal Food Industry

“…When these polymers are degraded in the gut, they could have antibacterial activity similar to short chain fatty acids (SCFAs) or organic acids. The breakdown of PHA inside the gastrointestinal tract can be carried out via chemical and enzymatic hydrolysis [70].…”

“…Chemical hydrolysis can be carried out by treating the polymers with, i.e., NaOH, in which could significantly accelerate its digestibility [70]. On the other hand, enzyme hydrolysis is generally carried out by extracellular depolymerases activities which are widely distributed among bacteria and fungi, acting as a preventive or curative protector against Vibrio sp.…”

Synthetic routes to degradable copolymers deriving from the biosynthesized polyhydroxyalkanoates: A mini review

“…Based on the mechanism of the heterogeneous hydrolysis, the scission of PHB chains occurs at the surfaces and interfaces of lamellar crystals. In acidic or alkaline solutions, PHB can be hydrolyzed via the random scission of the ester bonds, forming insoluble/soluble oligomers or monomeric acids [63]. The unsaturated end group was formed by dehydration of the chain ends by !-elimination after ester hydrolysis, different from the mechanism of thermal decomposition [64].…”

Generation and Utilization of Microbial Biomass Hydrolysates in Recovery and Production of Poly(3-hydroxybutyrate)

“…The cells were cultivated in 200 mL mineral medium containing: 160 mL glucose mineral solution, 8 mL inoculum, 5-20 mL solutions of residual microbial biomass hydrolysates, and the rest pre-sterilized water. The glucose mineral solution contained (per liter): 12 g glucose, 2 g NaH2PO4, 2.8 g K2HPO4, 0.5 g MgSO4.7H2O, 1 g (NH4)2SO4 and 1 mL trace solution [21]. The culture solution was shaken in a 500 mL baffled flask at 30 o C and 200 rpm in a rotary incubator for 24 or 48 hours.…”