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Community profile governs substrate competition in polyhydroxyalkanoate (PHA)-producing mixed cultures
New Biotechnology ( IF 5.4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.nbt.2020.03.003
Xiaofei Wang 1 , Adrian Oehmen 2 , Gilda Carvalho 2 , Maria A M Reis 2
Affiliation  

Polyhydroxyalkanoates (PHAs) are biobased, biodegradable polymers that can be produced efficiently by mixed microbial cultures (MMCs) at low cost. Substrate preferences have been found to vary depending on the microbial composition in the MMCs. In this study, the competition between the uptake of different substrates has been related for the first time to the abundance of certain microbial communities. With a higher abundance of Plasticicumulans enriched in the culture, the inhibitory effect of butyrate and valerate on the uptake of acetate and propionate increased and the hydroxybutyrate:hydroxyvalerate (HB:HV) ratio in the final PHA polymer approached the theoretical value calculated from the volatile fatty acid (VFA) composition. This finding can help understanding of the metabolism of PHA accumulating microorganisms and thus predict better the VFA consumption and PHA composition.

中文翻译:

群落概况控制产生聚羟基链烷酸酯 (PHA) 的混合培养物中的底物竞争

聚羟基链烷酸酯 (PHA) 是生物基、可生物降解的聚合物,可以通过混合微生物培养物 (MMC) 以低成本高效生产。已发现底物偏好因 MMC 中的微生物组成而异。在这项研究中,不同底物吸收之间的竞争首次与某些微生物群落的丰度有关。随着培养物中富集的塑料堆积蛋白的丰度更高,丁酸和戊酸对乙酸和丙酸吸收的抑制作用增加,最终 PHA 聚合物中的羟基丁酸:羟基戊酸 (HB:HV) 比值接近由挥发分计算得出的理论值。脂肪酸 (VFA) 组成。
更新日期:2020-09-01
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