Production of Polyhydroxyalkanoates from Agricultural Waste and Surplus Materials

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• 作者：Martin Koller ; Rodolfo Bona ; Gerhart Braunegg ; Carmen Hermann ; Predrag Horvat ; Markus Kroutil ; Julia Martinz ; Jose Neto ; Luis Pereira ; and Paula Varila
• 刊名：Biomacromolecules
• 出版年：2005
• 出版时间：March 2005
• 年：2005
• 卷：6
• 期：2
• 页码：561 - 565
• 全文大小：235K
• 年卷期：v.6,no.2(March 2005)
• ISSN：1526-4602

文摘

To be competitive with common plastics, the production costs of polyhydroxyalkanoates (PHAs) have to beminimized. Biotechnological polymer production occurs in aerobic processes; therefore, only about 50% ofthe main carbon sources and even a lower percentage of the precursors used for production of co-polyestersend up in the products wanted. A second cost factor in normally phosphate-limited production processes forPHAs is the costs for complex nitrogen sources. Both cheap carbon sources and cheap nitrogen sources areavailable from agricultural waste and surplus materials and make a substantial contribution for minimizingPHA production costs. In this study, fermentations for PHA production were carried out in laboratory-scalebioreactors on hydrolyzed whey permeate and glycerol liquid phase from the biodiesel production using ahighly osmophilic organism. Without any precursor, the organism produced a poly[3(hydroxybutyrate-co-hydroxyvalerate)] copolyester on both carbon sources. During the accumulation phases, a constant3-hydroxyvalerate content of 8-10% was obtained at a total PHA concentration of 5.5 g/L (on hydrolyzedwhey permeate) and 16.2 g/L (glycerol liquid phase). In an additional fermentation, an expensive nitrogensource was substituted by meat and bone meal beside the glycerol liquid phase as a carbon source, resultingin a final PHA concentration of 5.9 g/L.