对于未经处理的家用PET废物脱聚合的新方法:重组细胞外恒温水解酶
Julieta Magalí Frescura1, Tomás Frosio2, Julia Yamila Santillán2
1Laboratorio de Bioprocesos Enzimáticos, Instituto de Microbiología Básica y Aplicada, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, CONICET, Bernal, Argentina.
Environmental technology
|September 14, 2025
概括
酶LCCICCG和IsPETaseW159H/F229Y可以有效地去聚合未经预处理的PET废物. 在Pichia pastoris中细胞外表达增强了酶的稳定性和活性,以实现可持续的塑料回收利用.
科学领域:
- 生物技术是生物技术.
- 环境科学 环境科学
- 聚合物科学 聚合物科学
背景情况:
- 塑料废物,特别是聚乙烯四甲酸盐 (PET),由于其持久性,构成了全球重大环境挑战.
- 有效和可持续的PET废弃物降解方法对于减轻环境污染至关重要.
研究的目的:
- 为了评估未经预处理的家庭PET废物的酶去聚合,使用两个塑料降解酶,LCCICCG和PETaseIsW159H/F229Y.
- 利用Pichia pastoris系统中细胞外表达的优势,以提高酶的稳定性和恢复.
- 评估这些酶在大规模,环境可持续的PET废物管理方面的潜力.
主要方法:
- 在Pichia pastoris中,LCCICCG和PETaseW159H/F229Y的细胞外表达.
- 确定酶活性水平和稳定性在不同的温度和时间点.
- 使用未经预处理的家用PET废物测试PET脱聚合效率.
主要成果:
- 在Pichia pastoris中的表达产生了高酶活性水平 (86.3 IU/mg用于LCCICCG和16.4 IU/mg用于PETaseIsW159H/F229Y),在4°C和25°C下保持超过30天的活性.
- LCCICCG展示了高的PET降解效率 (87.6gPETh-1g酶-1) 和卓越的时空产量 (183.1mMTAeqh-1 mg酶-1).
- 与之前的报道相比,PETase W159H/F229Y 的脱聚合效率增加了十倍 (1.71 g PET h-1 g 酶-1).
结论:
- 在Pichia pastoris中细胞外表达提供了一个强大的平台,用于生产稳定和活跃的PET降解酶.
- LCCICCG是工业应用的非常有前途的生物催化剂,特别是在高温PET废物处理中.
- 这些发现支持开发具有成本效益和可持续的PET废物管理策略,通过减少对预处理的需求.
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