Kompetenzzentrum Holz GmbH, Competence Centre for Wood Composites and Wood Chemistry (Wood K Plus), Altenberger Straße 69, 4040 Linz, Austria.
Institute of Environmental Biotechnology, Department of Agrobiotechnology, IFA-Tulln, University of Natural Resources and Life Science Vienna, Konrad Lorenz Straße 20, 3430 Tulln, Austria; Bioenergy2020+, Inffeldgasse 21b, 8010 Graz, Austria.
Int J Biol Macromol. 2017 Sep;102:497-504. doi: 10.1016/j.ijbiomac.2017.04.054. Epub 2017 Apr 15.
The current commercial production of polyhydroxyalkanoates (PHA) is based on heterotrophic bacteria, using organic carbon sources from crops. To avoid the competition with food and feed production, cyanobacteria, metabolising PHA from carbon dioxide can be used. This research focuses on the investigation of the thermal and rheological properties of PHA polymers accumulated by Synechocystis salina, which had been cultivated in digestate supernatant and a mineral medium. The dried bacterial cells had a polymer content of 5.5-6.6%. The relevance of the derived PHA polymers for the common melt polymer processing was correlated with their molecular mass distribution as well as with their thermal and rheological properties. The determined thermal and rheological properties showed that PHA polymers accumulated by S. salina on digestate supernatant or mineral medium are comparable with the commercial available poly(3-hydroxybutyrate). However, the results showed that PHA polymers in general require modification before melt processing to increase their stability in the molten state.
目前聚羟基烷酸酯（PHA）的商业生产基于异养细菌，使用来自农作物的有机碳源。为了避免与食品和饲料生产竞争，可以使用能够将二氧化碳转化为 PHA 的蓝细菌。本研究集中于对在消化液上清液和矿物培养基中培养的集胞藻（Synechocystis salina）积累的 PHA 聚合物的热和流变性能的研究。干燥的细菌细胞的聚合物含量为 5.5-6.6%。所得到的 PHA 聚合物与普通熔融聚合物加工的相关性与其分子量分布以及其热和流变性能有关。所确定的热和流变性能表明，在消化液上清液或矿物培养基上由 S. salina 积累的 PHA 聚合物与商业可得的聚（3-羟基丁酸酯）相当。然而，结果表明，一般来说，PHA 聚合物在熔融加工之前需要进行改性，以提高其在熔融状态下的稳定性。
