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Estimation on Biodegradability of Poly (3-hydroxybutyrate-<Emphasis Type="Italic">co</Emphasis>-3-hydroxyvalerate) (PHB/V) and Numbers of Aerobic PHB/V Degrading Microorganisms in Different Natural Environments
Authors:Shufang?Wang  Email author" target="_blank">Cunjiang?SongEmail author  Wataru?Mizuno  Mitsuyo?Sano  Maeda?Maki  Chao?Yang  Banghua?Zhang  Shigeya?Takeuchi
Institution:(1) State Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Institute of Polymer Chemistry, Nankai University, 300071 Tianjin, P. R. China;(2) Department of Microbiology, Life Science College, Institute of Polymer Chemistry, Nankai University, 300071 Tianjin, P. R. China;(3) Toyama Industrial Technology Center, 933-0981, Futagami-machi Takaoka, Toyama , Japan;(4) Faculty of Education, Toyama University, 930-8555, Gofuku, Toyama , Japan
Abstract:To assess the capacity of the natural environment for degrading PHB/V, the film-MPN method proposed previously was modified to estimate the numbers of PHB/V degrading microorganisms (degraders) in various environments. The First-Order Reaction (FOR) model was used to determine the appropriate incubation period for the method. Numbers of aerobic PHB/V degraders were estimated in garden soil, paddy field soil, farm soil, river bank soil, infertile garden soil, river water, activated sludge, and seawater by the film-MPN method. Results were compared with those estimated by the clear-zone technique and showed that the film-MPN method was suitable for estimating the numbers of PHB/V degraders in the environments tested. On the other hand, biodegradability of injection molded PHB/V samples was investigated in several kinds of environments. The changes of weight were studied and results showed that biodegradability of PHB/V related to the numbers of PHB/V degraders in similar ecosystem in different regions. In different environments the biodegradability of PHB/V not only related to the number of PHB/V degraders, but also depended on whether there were conditions for the PHB/V degraders to grow and proliferate easily in the environment.
Keywords:Biodegradation  film-MPN method  PHB/V degrader  natural environment  injection molded PHB/V sample
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