Microbial Degradation of Polyesters

Degradation of polyesters by a novel marine Nocardiopsis aegyptia sp. nov.: Application of Plackett-Burman experimental design for the improvement of PHB depolymerase activity

“…Aerobic and anaerobic PHA degrading bacteria were isolated from various ecosystems such as soil, compost, aerobic and anaerobic sewage sludge, fresh and marine water, estuarine sediment, and air (Abou-Zeid et al, 2001;Jendrossek, 2001;Jendrossek et al, 1996).…”

Thiol-functionalized copolymeric polyesters by lipase-catalyzed esterification and transesterification of 1,12-dodecanedioic acid and its diethyl ester, respectively, with 1-thioglycerol

“…Moreover, chemical side-reactions are limited to a minimum and only small proportions of organic solvents may be necessary in some cases to disperse and/or dissolve the reactants at the beginning of the enzymatic conversion. Polyoxoesters are widely degraded by microbial hydrolases (Jendrossek 2001;Tokiwa and Calabia 2004). This is expected for polyoxoesters containing methylenethiol groups as well, whereas polythioesters are hardly perceptable to microbial degradation (Steinbüchel 2005).…”

“…PE having high molecular weights are formed by biotransformation of hydroxy alkanoic acids in microorganisms (Kim and Lenz 2001;Steinbüchel and Hein 2001) or by lipase-catalyzed esterification and transesterification of , -alkanedioic acids and their methyl esters, respectively, with , -alkanediols in vitro (Kazlauskas and Bornscheuer 1998;Kobayashi and Uyama 2001;Rehm 2006). In contrast to polythioesters, polyoxoesters are more easily decomposed by microbial hydrolases such as lipases or depolymerases (Jendrossek 2001;Tokiwa and Calabia 2004). This is also expected for PE containing thiol or thioether functions, as compared to polythioesters, which may be of advantage from an environmental point of view.…”

Degradable Polyhydroxyalkanoates of Microbial Origin as a Technical Analog of Non-Degradable Polyolefines

“…Цикл углерода полимеров, полученных из нефти, и биополимеров. Путь возобновляемых ресурсов (белые стрелки); путь ископаемых (невозобновляемых) ресурсов (черные стрелки); путь возобновляемых и невозобновляемых ресурсов (серая стрелка) (Kijchavengkul, Auras, 2008) полимеров в землю для выращивания новой (Jendrossek et al, 1996;Jendrossek, 2001). Группа ученых под руковод-ством Дои (Doi et al, 1990 таких как почва, компост, аэробный и ана-эробный ил сточных вод, пресной и морской воды, осадков эстуариев и воздуха (Imam et al, 1999;Kusaka et al, 1999;Shah et al, 2007).…”