不同纬度土壤生态系统中微生物塑料聚(3-羟基丁酸)的生物降解

IF 5.4 1区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY GIANT Pub Date : 2024-05-16 DOI:10.1016/j.giant.2024.100288
Svetlana V. Prudnikova , Evgeniy G. Kiselev , Aleksey V. Demidenko , Ivan V. Nemtsev , Ekaterina I. Shishatskaya , Sabu Thomas , Tatiana G. Volova
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摘要

研究了 "绿色 "塑料聚(3-羟基丁酸)[P(3HB)]在不同地理区域土壤中的降解特征:热带条件下的红铁质土壤(印度喀拉拉邦)和大陆性气候条件下的切尔诺泽姆土壤(俄罗斯东西伯利亚)。研究发现,所研究土壤的化学成分、温度和湿度存在显著差异。西伯利亚chernozem土壤中的细菌和菌丝真菌数量高于印度红壤,从2-3倍到10倍甚至更多。P(3HB)薄膜在chernozem中的降解速度快于红壤,因为红壤更干燥,腐殖质和矿物质含量低,微生物数量也少于chernozem。西伯利亚和印度聚合物样本的半衰期分别为 64.8 天和 126.4 天。在降解过程中,聚合物样本的分子量下降,结晶度增加,这表明土壤微生物对聚合物无定形相的生物降解更为活跃。聚合物的主要降解者已被分离和鉴定出来,并表明不同类型土壤中降解细菌和真菌的复合体没有共同的物种。尽管存在具有明显解聚酶活性的菌种,但在不利的环境条件下,红铁矿土壤中的薄膜降解速度减慢。研究结果证实了在自然条件下研究 PHA 降解过程的重要性。
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Biodegradation of microbial plastic poly(3-hydroxybutyrate) in soil ecosystems at different latitudes

The features of the degradation of the "green" plastic poly(3-hydroxybutyrate) [P(3HB)] in the soil of various geographical regions were studied: in red ferralitic soil under tropical conditions (Kerala, India) and in chernozem soil under conditions of a sharply continental climate (Eastern Siberia, Russia). Significant differences in the chemical composition, temperature, and humidity of the studied soils were revealed. The number of bacteria and mycelial fungi in the Siberian chernozem was higher than in the red soil of India, from 2-3 to 10 or more times. The degradation of P(3HB) films in the chernozem occurred faster than in the red soil, which was drier, with a low content of humus and minerals, and fewer microorganisms than the chernozem. The half-life of polymer samples in Siberia and India was 64.8 and 126.4 days, respectively. During degradation, a decrease in the molecular weight and an increase in the degree of crystallinity of polymer samples were revealed, which indicates a more active biodegradation of the amorphous phase of the polymer by soil microorganisms. The primary degraders of the polymer have been isolated and identified, and it has been shown that the complexes of degrading bacteria and fungi in different types of soils did not have common species. Despite the presence of species with pronounced depolymerase activity, the rate of film degradation in red ferralitic soils was slowed down by unfavorable environmental conditions. The obtained results confirm the importance of studying the process of PHA degradation in natural conditions.

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来源期刊
GIANT
GIANT Multiple-
CiteScore
8.50
自引率
8.60%
发文量
46
审稿时长
42 days
期刊介绍: Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.
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