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鼠李糖脂在从污染沉积物中去除钒方面的应用。

Rhamnolipids Application for the Removal of Vanadium from Contaminated Sediment.

作者信息

San Martín Yaima Barrios, Toledo León Heidy F, Rodríguez Arelis Ábalos, Marqués Ana M, López Maria I Sánchez

机构信息

Laboratory of Biotechnology, Oil Research Centre (Ceinpet), Churruca #481, CP 12600, Cerro, La Habana, Cuba.

University of Orient, Santiago de Cuba, Cuba.

出版信息

Curr Microbiol. 2021 May;78(5):1949-1960. doi: 10.1007/s00284-021-02445-5. Epub 2021 Apr 3.

Abstract

The use of biosurfactants in bioremediation of hydrocarbons and in the removal of heavy metals in crude oils is considered an attractive subject. The vanadium pollution in soil and sediments had attracted research interest in exploring eco-friendly methods of remediation. The present study was conducted to evaluate the potential of a biosurfactant to remove vanadium from artificially contaminated sand. The biosurfactant producer's strain selection process was carried out from 23 strains in two steps. In the primary screening, four preliminary tests were carried out: the emulsification index (24 and 72 h), the surface tension, and the rate of bacterial adhesion to hydrocarbons. In the secondary screening, the surface tension and rhamnolipids concentration were determined, also critical micellar concentration and dilution were calculated. The RNA 16s of selected strain was sequence and the strain was identified as Pseudomonas sp. By chromatographic and spectroscopic assays, the structure of the rhamnolipids was determined. The maximal vanadium removal efficiency (85.5%) was achieved with a rhamnolipids' concentration of 240 mg l. The vanadium concentration was determined by spectroscopic technique. Rhamnolipids produced by this strain can potentially be used in the removal of vanadium.

摘要

生物表面活性剂在烃类生物修复以及原油中重金属去除方面的应用被认为是一个有吸引力的课题。土壤和沉积物中的钒污染引发了人们对探索环保修复方法的研究兴趣。本研究旨在评估一种生物表面活性剂从人工污染砂中去除钒的潜力。生物表面活性剂产生菌的菌株筛选过程分两步从23株菌株中进行。在初步筛选中,进行了四项初步测试:乳化指数(24小时和72小时)、表面张力以及细菌对烃类的粘附率。在二次筛选中,测定了表面张力和鼠李糖脂浓度,还计算了临界胶束浓度和稀释度。对所选菌株的RNA 16s进行测序,该菌株被鉴定为假单胞菌属。通过色谱和光谱分析确定了鼠李糖脂的结构。鼠李糖脂浓度为240 mg/l时,钒的最大去除效率达到85.5%。通过光谱技术测定钒浓度。该菌株产生的鼠李糖脂有可能用于钒的去除。

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