Phân hủy cometabolic Trichloroethylene bởi Rhodococcus sp. L4 được kích thích bằng tinh dầu thực vật

Biodegradation - Tập 20 Số 2 - Trang 281-291 - 2009
Suttinun, Oramas1,2, Müller, Rudolf3, Luepromchai, Ekawan2,4
1International Postgraduate Programs in Environmental Management (Hazardous Waste Management), Graduate School, Chulalongkorn University, Bangkok, Thailand
2National Center of Excellence for Environmental and Hazardous Waste Management (NCE-EHWM), Chulalongkorn University, Bangkok, Thailand
3Institute of Technical Biocatalysis, Technical University Hamburg-Harburg, Hamburg, Germany
4Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand

Tóm tắt

Sự phân hủy cometabolic TCE bởi vi khuẩn phân hủy toluene có thể là một công nghệ xử lý sinh học tiết kiệm chi phí. Tuy nhiên, việc áp dụng toluene có thể gây ra các vấn đề môi trường. Trong nghiên cứu này, một số tinh dầu thực vật và các thành phần của chúng đã được khảo sát như các chất kích thích thay thế cho sự phân hủy cometabolic TCE trong một loại vi khuẩn phân hủy toluene, Rhodococcus sp. L4. Sử dụng nồng độ TCE ban đầu là 80 μM, các tế bào được nuôi cấy bằng tinh dầu chanh và tinh dầu sả có khả năng phân hủy TCE lần lượt là 20 ± 6% và 27 ± 8%, thấp hơn so với các tế bào nuôi cấy bằng toluene (57 ± 5%). Khả năng phân hủy TCE tăng lên 36 ± 6% khi vi khuẩn được kích thích bằng tinh dầu thì là. Việc kích thích các enzym phân hủy TCE được cho là do sự hiện diện của citral, aldehyde thì là, cumene và limonene trong các tinh dầu này. Đặc biệt, hiệu quả của aldehyde thì là và cumene như các chất kích thích cho sự phân hủy cometabolic TCE tương đương với toluene. Năng lực chuyển hóa TCE (T c) của các tế bào được kích thích này nằm trong khoảng từ 9,4 đến 15,1 μg TCE mg tế bào−1, tương tự như các vi khuẩn đã biết phân hủy toluene, phenol, propane hoặc amoniac. Vì các tinh dầu thực vật này rất phong phú và được coi là không độc đối với con người, chúng có thể được áp dụng để kích thích sự phân hủy TCE trong môi trường.

Từ khóa

#Rhodococcus #TCE #phân hủy cometabolic #tinh dầu thực vật #toluene

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