聚乙烯和聚烯微塑料影响土壤 总抗氧化能力和外酶分泌量
Suryasikha Samal1, Pratik Acharya1, Rashmi Rekha Samal2
1Department of Zoology, College of Basic Science and Humanities, Odisha University of Agriculture and Technology, Bhubaneswar, India.
概括
聚乙烯 (PVC) 和聚烯 (PP) 微塑料 (MPs) 通过降低总抗氧化能力和大多数微生物酶活动,损害土壤健康. 然而,细胞酶活性增加,特别是在PPMP中.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生态毒理学 生态毒理学
背景情况:
- 微塑料 (MPs) 来自常见的聚合物,如聚乙烯 (PVC) 和聚烯 (PP),是生态系统中普遍存在的污染物.
- 这些MP源于广泛的塑料垃圾的降解,构成重大环境风险.
- 了解MPs对土壤健康的影响,包括生物化学性质,对于生态风险评估至关重要.
研究的目的:
- 研究PVC和PP微塑料对土壤总抗氧化能力 (TAC) 的影响.
- 评估PVC和PPMP对土壤中关键微生物外酶活动的影响.
- 探索PVC和PPMPs与土壤外酶的差异性结合亲和力.
主要方法:
- 控制实验室实验涉及向土壤添加0.25% (w/w) 的PVC和PP MPs.
- 在72小时内测量土壤TAC和氨酶,逆转酶,脱酶和细胞酶的活动.
- 利用分子对接模拟来预测MP-exoenzyme的结合亲缘关系.
主要成果:
- 在72小时后,土壤TAC和氨基酶,逆转酶和脱酶的活动显著减少.
- 细胞酶活动显示,国会议员的存在显著增加.
- 分子对接表明,PP MPs与PVC MPs相比,对外酶的结合亲和力更强,特别是对于细胞酶.
结论:
- 微塑料,特别是PVC和PP,对土壤的总抗氧化能力和大多数微生物外酶功能产生负面影响.
- 观察到细胞酶活性的一个例外,MP存在会增强细胞酶活性.
- 微塑料的类型影响其与土壤酶的相互作用,PP显示出更大的亲和力,特别是对细胞酶.
相关概念视频
01:28Microbial Bioremediation of Pesticides
78
Pesticides often feature structurally complex chemical architectures, incorporating halogen groups and multiple aromatic rings. These characteristics confer high chemical stability, rendering many pesticides resistant to natural degradation processes. This resistance poses significant environmental concerns, as persistent pesticide residues can accumulate in ecosystems and affect non-target organisms.Despite the inherent stability of many pesticides, certain microorganisms possess the metabolic...
78
01:27Bioplastics
67
Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
67
01:28Microbial Bioremediation of Plastics
123
Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
123