Sevadal Mahila Mahavidyalaya, Nagpur University, Sakkardara Square, Umrer Road, Nagpur 440009, India.
Bioresour Technol. 2012 Dec;126:368-74. doi: 10.1016/j.biortech.2012.05.024. Epub 2012 May 12.
Surface-active potential of biosurfactants produced cost-effectively in curd whey by Pseudomonas aeruginosa strain-PP2 and Kocuria turfanesis strain-J were tested using parameters viz. surface tension (ST) reduction, F(CMC) (highest dilution factor to reach critical micelle concentration) and emulsification index (EI-24) of pesticides; monocrotophos and imidacloprid at extreme environmental conditions. Results have shown that ST reduction of biosurfactants was stable at pH 2-11. High F(CMC) of the biosurfactant in the fermented whey at low pH improved emulsification of pesticides. ST marginally increased at 5% and 15% NaCl, resulting in high EI-24 and F(CMC). Over a range of temperatures 30-121 °C, ST remained low with a higher F(CMC) and EI-24 at 60 °C than at 121 and 30 °C. The biosurfactants have shown differences in their surface-active property and have marked specificity to emulsify pesticides in extreme environmental conditions.
采用表面张力（ST）降低、F（CMC）（达到临界胶束浓度的最高稀释因子）和农药乳化指数（EI-24）等参数，测试了在凝乳乳清中以经济有效的方式由铜绿假单胞菌菌株-PP2 和吐鲁番微球菌菌株-J 产生的生物表面活性剂的表面活性潜能。在极端环境条件下，用单虫脒和吡虫啉进行了测试。结果表明，生物表面活性剂的 ST 降低在 pH 值 2-11 之间稳定。在低 pH 值下发酵乳清中生物表面活性剂的高 F（CMC）提高了农药的乳化能力。在 5%和 15%NaCl 下，ST 略有增加，导致 EI-24 和 F（CMC）升高。在 30-121°C 的温度范围内，ST 保持较低水平，F（CMC）和 EI-24 在 60°C 时均高于 121°C 和 30°C。生物表面活性剂在其表面活性特性上表现出差异，并在极端环境条件下对乳化农药具有明显的特异性。
