Biosynthesis of poly(3‐hydroxybutyrate‐co‐3‐hydroxvalerate) from volatile fatty acids by Cupriavidus necator

Abstract

A promising strategy to alleviate the plastic pollution from traditional petroleum‐based plastics is the application of biodegradable plastics, in which polyhydroxyalkanoates (PHAs) have received increasing interest owing to their considerable biodegradability. In the PHAs family, poly(3‐hydroxybutyrate‐co‐3‐hydroxvalerate) (PHBV) has better mechanical properties, which possesses broader application prospects. With this purpose, the present study adopted Cupriavidus necator to synthesize PHBV utilizing volatile fatty acids (VFAs) as sole carbon sources. Results showed that the concentration and composition of VFAs significantly influenced the production of PHAs. Especially, even carbon VFAs (acetate and butyrate) synthesized only poly(3‐hydroxybutyrate) (PHB), while the addition of odd carbon VFAs (propionate and valerate) resulted in PHBV production. The 3‐hydroxyvalerate (3HV) contents in PHBV were directly determined by the specific VFAs compositions, in which valerate was the preferred substrate for 3HV accumulation. After optimization by response surface methodology, the highest PHBV accumulation achieved 79.47% in dry cells, and the conversion efficiency of VFAs to PHBV reached 40%, with the PHBV production of 1.20 ± 0.05 g/L. This study revealed the metabolic rule of VFAs converting into PHAs by C. necator and figured out the optimal VFAs condition for PHBV accumulation, which provides a valuable reference for developing downstream strategies of PHBV production in industrial applications in future.

Microbiome dynamics and products profiles of biowaste fermentation under different organic loads and additives

“…While butyrate‐dominant VFA streams showed high potential on the biosynthesis of biodegradable polymers. Specifically, butyrate could obtain the highest maximum dry cell weight of 1.53 ± 0.06 g/L and polyhydroxyalkanoates (PHA) production of 1.04 ± 0.04 g/L [ 49 ]. The current study showed that adding a methanogenic inhibitor (BES) a is undoubtedly the most efficient method to promote VFA production on a laboratory scale.…”

Butyric Acid and Caproic Acid Production Using Single and Mixed Bacterial Cultures

“…Among the VFAs studied, valeric acid induced the highest accumulation of 3-hydroxyvalerate units. Cai et al have demonstrated in particular that even-carbon VFAs (acetate and butyrate) synthesized only poly(3-hydroxybutyrate) (PHB), while the addition of odd-carbon VFAs (propionate and valerate) resulted in PHBV production [5]. Tian et al also have mentioned that Photobacterium sp.…”

“…Proc. 2023, 56, 73 2 of 8 valerate) resulted in PHBV production [5]. Tian et al also have mentioned that Photobacterium sp.…”