Accumulation of bioplastic polyhydroxyalkanoate with different substrate forms from pretreated waste lignocellulose hydrolysate
文献类型： 外文期刊
作者： Li, Dongna 1 ; Li, Jianing 2 ; Ma, Xiaojun 1 ;
作者机构： 1.Tianjin Univ Sci & Technol, Coll Light Ind Sci & Engn, Tianjin 300222, Peoples R China
2.Chinese Acad Trop Agr Sci, State Key Lab Breeding Base Cultivat & Physiol Tr, Key Lab Biol & Genet Resource Utilizat Rubber Tre, Minist Agr,Rubber Res Inst, Danzhou 571737, Peoples R China
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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