Production and characterization of a biodegradable poly (hydroxybutyrate-co-hydroxyvalerate) (PHB-co-PHV) copolymer by moderately haloalkalitolerant Halomonas campisalis MCM B-1027 isolated from Lonar Lake, India

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymer production by the diazotrophic cyanobacterium Nostoc muscorum Agardh: Process optimization and polymer characterization

“…The degree of crystallinity of PHB was found to be highest (62.8%) than that of the P(3HB-co-3HV) copolymer with 8, 16 and 27 mol% HV (56.6, 44.7, 39.5%, respectively) ( Table 5). These are well in accord with the findings of Kulkarni et al [25]. Furthermore, the T g value decreased from 0.8°C to −4.7°C with increasing 3HV fraction from 0 to 27 mol%.…”

Characterization of poly-3-hydroxybutyrate (PHB) produced from Ralstonia eutropha using an alkali-pretreated biomass feedstock

“…The peaks of the bacteria-produced PHB were almost identical to those of the standard PHB in the above regions. Therefore, the results of FTIR analysis of the PHB produced by R. eutropha are in complete agreement with other reports [5,11,30,39].…”

“…Even the same kind of PHB produced by different microbes can have different thermal properties [5,39]. T g and T m of PHB in our study were about 10 • C and 172 • C, respectively, which is very close to T g (9-15 • C) and T m (175 • C) of the standard PHB sample (Fig.…”

“…A peak at 1043 cm −1 that corresponds to stretching of the C O bond of the ester group [5,30] was also observed. In addition, the peak at 3444 cm −1 was mainly formed by OH groups as a result of water adsorption [30,39], which was seen in both spectra (bacteria-produced PHB and synthetic [standard] PHB). The peaks of the bacteria-produced PHB were almost identical to those of the standard PHB in the above regions.…”

Strategies for Large-scale Production of Polyhydroxyalkanoates

“…droxyvalerate-co-4-hydroxybutyrate) P(3HB-co-3HV --co-4HB), have been produced by batch fermentation. [40][41][42][43][44][45][46][47][48][49][50] Production of mcl-PHAs and other interesting PHA copolymers including scl-copolymers and scl-mcl copolymers has also been reported using unconventional substrates, such as lignocellulosics e.g., grass mass hydrolysate, rice bran, rapeseed meal hydrolysate, and industrial waste e.g., whey, biodiesel waste, vinnase etc. 35,48,[51][52][53][54][55][56] Utilization of waste whey for PHA production is particularly useful as only 50 % of the whey produced is used for production of food ingredients and animal feed, while the rest remains as a pollutant owing to its high biological oxygen demand.…”