Syndiotactic poly[(R,S)-?-hydroxybutyrate]isolated from methylaluminoxane-catalyzed polymerization

Polyesters

“…Atactic, syndiotactic, and isotactic PHBs have been reported. 108,109 The properties of naturally occurring PHAs depend on the composition: PHB is a highly crystalline, brittle polymer with T m = 177…”

Protein Engineering of Enzymes Involved in Bioplastic Metabolism

“…Chemical structures of PHAs have influence on their enzymatic hydrolysis by multi-domain e-PHB depolymerases. Various types of PHAs including racemic PHA [82][83][84][85][86][87][88][89] and 3HA oligomers [90,91], PHAs with different main-and side-chain lengths (Kasuya et al, 1997) [77], and random copolymers of (R)-3HB with various hydroxyalkanoate units [92][93][94][95] have been synthesized to examine their enzymatic degradation by a variety of e-PHB depolymerases. For instance, Abe et al proposed a schematic model of the enzymatic cleavage of the PHA chain by PhaZ RpiT1 (Figure 5), in which its active site can recognize at least three neighboring monomer units with a certain degree of difference in main-chain length [93].…”

Mikrobielle und chemische Synthese von biologisch abbaubaren Polyestern

“…Alle genannten Anwendungen werden zur Zeit getestet. [50]. Vor-und Nachtcile der verschicdencn Syntheseverfahren von Poly(3HB) aus 3-Butyrolacton wurdcn kiirzlich von Seebach und Mitarbeitern sehr detailliert in einem Ubersichtsartikel verglichen [7].…”