Accumulation of bioplastic polyhydroxyalkanoate with different substrate forms from pretreated waste lignocellulose hydrolysate

文献类型： 外文期刊

第一作者： Li, Dongna

作者： Li, Dongna;Ma, Xiaojun;Li, Jianing

作者机构：

关键词： Activated sludge; Lignocellulose hydrolysate; Volatile fatty acids; Co-substrate; Polyhydroxyalkanoate; Characterization

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：5.645； 五年影响因子：5.749 ）

ISSN： 0926-6690

年卷期： 2021 年 172 卷

页码：

收录情况： SCI

摘要： Lignocellulose, derived from non-food crops, is a competitive renewable sugar source. In this study, it was pretreated to produce lignocellulose hydrolysate (reducing sugar), and then used as co-substrate to accumulate polyhydroxyalkanoate (PHA) with its fermented product volatile fatty acids (VFAs). The rule of PHA accumulation and structural characterization from single VFAs, lignocellulose hydrolysate and VFAs co-substrate two carbon sources were investigated. As a functional green material, it is expected to replace the traditional petroleum-based polymer. During the culture process, compared with single VFAs carbon source, higher PHA production of 3049 mg COD/L was achieved with the addition of co-substrate, especially the proportion of 3-hydroxyvalerate (HV) monomer reached 44.9 % at C/N ratio of 33. The average molecular weight of PHA was 1.16 similar to 1.27 x 10(5) Da, with a polydispersity index of 2.08 similar to 2.46. The synthesized PHA was thermal stable up to 285 degrees C, which was 14 degrees C higher than that of commercial poly (hydroxybutyrate-co-hydroxyvalerate) (PHBV). As a biopolymer film, it possessed high tensile strength (8.13 +/- 0.607 MPa), Young's modulus (875.47 +/- 26.21 MPa).

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