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首页> 外文期刊>Microbial Pathogenesis >Antioxidant, antibacterial, and anti-adhesive activities of biosurfactants isolated from Bacillus strains
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Antioxidant, antibacterial, and anti-adhesive activities of biosurfactants isolated from Bacillus strains

机译：从芽孢杆菌菌株中分离的生物活性剂的抗氧化剂，抗菌和抗粘接活性

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摘要

Biosurfactants are surface-active compounds that display a range of physiological functions. The present study investigated the antioxidant, antimicrobial, and anti-adhesive or anti-biofilm potential of biosurfactants isolated from Bacillus subtilis VSG4 and Bacillus licheniformis VS16. The antioxidant activity of the biosurfactants was studied in vitro using 2,2-dipheny1-1-picrylhydrazyl (DPPH) and hydroxyl radicals. At 5 mg/mL of the bio-surfactant concentration, the scavenging of DPPH and hydroxyl radicals was found to be between 69.1-73.5% and 63.3-69.8%, respectively. The biosurfactants also displayed significant antibacterial activities against both Gram-positive and Gram-negative bacteria. The anti-adhesive activities of the biosurfactants were evaluated against Staphylococcus aureus ATCC 29523, Salmonella typhimurium ATCC 19430, and Bacillus cereus ATCC 11778. The biosurfactants exhibited anti-adhesive activity, even at concentrations of 3-5 mg/mL. Moreover, both biosurfactants displayed notable anti-biofilm activities with a biofilm eradication percentage ranging from 63.9 to 80.03% for VSG4 biosurfactant, and from 61.1-68.4% for VS16 biosurfactant. Furthermore, VSG4 biosurfactant exhibited emulsification and surface tension stability over a wide range of pH (4-10) and temperature up to 100 degrees C. These results show that VSG4 and VS16 biosurfactants can be potentially used as natural antioxidants, antimicrobials, and/or anti-adhesive agents for food and biomedical applications.
机译：生物表面活性剂是显示一系列生理功能的表面活性化合物。本研究研究了从枯草芽孢杆菌VSG4和芽孢杆菌的生物表面活性剂的抗氧化剂，抗微生物和抗粘接或抗生物膜潜力。使用2,2-Dipheny1-1-野生酰胺（DPPH）和羟基自由基体外研究生物件的抗氧化活性。在5mg / ml生物表面活性剂浓度下，发现DPPH和羟基自由基的清除分别为69.1-73.5％和63.3-69.8％。生物表面活性剂还针对革兰氏阳性和革兰氏阴性细菌显示出显着的抗菌活性。将生物表面活性剂的抗粘附活性评估对金黄色葡萄球菌ATCC 29523，沙门氏菌毛孢菌ATCC 19430和Bacillus Cereus ATCC 11778评价。即使在3-5mg / ml的浓度下也表现出抗粘合剂活性。此外，两种生物表面活性剂显示出显着的抗生物膜活性，生物膜消除百分比范围为VSG4生物活性剂的63.9至80.03％，对VS16生物活性剂的61.1-68.4％。此外，VSG4生物活性剂在宽范围的pH（4-10）和高达100℃的温度范围内表现出乳化和表面张力稳定性。这些结果表明VSG4和VS16生物表面活性剂可以是天然抗氧化剂，抗微生物和/或用于食品和生物医学应用的抗粘连剂。

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