Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) co-polymer production from a local isolate, Brevibacillus invocatus MTCC 9039

Enhancement of poly(3-hydroxybutyrate) thermal and processing stability using a bio-waste derived additive

“…synthesis of copolyesters containing different PHAs units other than PHB, by using different bacterial strains or chemical synthesis routes [11,12]. Furthermore, blending of PHB with high or low molecular weight components, such as suitable organic and inorganic additives, represents another approach to provide both an upgrading of processing and manufacturing performance, and a relative inexpensive strategy to enhance polymer physical properties [13][14][15][16][17][18].…”

Enhancing the 3‐hydroxyvalerate component in bioplastic PHBV production by Cupriavidus necator

“…Much work has been done to substitute these conventional plastics for bioplastics produced from renewable resources. Polyhydroxyalkanoates (PHAs) are a family of bioplastics with a very wide range of properties and applications [1-3].Poly(3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) is among the most popular PHA, the 3-hydroxyvalerate (3-HV) content of which plays a key role in the thermal and mechanical properties of PHBV [1,[4][5][6]. When the 3-HVcontent increases, the melting and glass transition temperatures decrease, along with the cell dry weight (CDW) and the PHA content in cells; this is why PHBV copolymers are five to six times more expensive than the poly(3-hydroxybutyrate) (PHB) homopolymer [7].It was demonstrated [8] that substances with odd-carbon numbers were most suitable for inducing 3-HVcontent, even if some species, such as Haloferax mediterranei [9] and Halomonas campisalis [10], produced PHBV without the addition of specific substrates.…”

“…When the 3-HVcontent increases, the melting and glass transition temperatures decrease, along with the cell dry weight (CDW) and the PHA content in cells; this is why PHBV copolymers are five to six times more expensive than the poly(3-hydroxybutyrate) (PHB) homopolymer [7].It was demonstrated [8] that substances with odd-carbon numbers were most suitable for inducing 3-HVcontent, even if some species, such as Haloferax mediterranei [9] and Halomonas campisalis [10], produced PHBV without the addition of specific substrates. Several 3-hydroxyvalerate-inducing substrates were used, among them propionic acid [11,12], propanol [13], sodium propionate [6,13,14], valeric acid [15][16][17], pentanol [13], valer-…”

“…Poly(3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) is among the most popular PHA, the 3-hydroxyvalerate (3-HV) content of which plays a key role in the thermal and mechanical properties of PHBV [1,[4][5][6]. When the 3-HVcontent increases, the melting and glass transition temperatures decrease, along with the cell dry weight (CDW) and the PHA content in cells; this is why PHBV copolymers are five to six times more expensive than the poly(3-hydroxybutyrate) (PHB) homopolymer [7].…”

New technologies from the bioworld: selection of biopolymer-producing microalgae

“…LEB 18. Lower yields (3%) of PHB were found by Sankhla et al [32] in the stationary phase of growth when studying the production of PHB by Brevibacillus invocatus MTCC 9039.…”