Department of Food Science and Technology, The University of Tennessee, Knoxville, Tennessee 37996, United States.
J Agric Food Chem. 2011 Sep 14;59(17):9572-80. doi: 10.1021/jf201864v. Epub 2011 Aug 11.
Antimicrobial delivery systems have been proposed as potential solutions to improve effectiveness of antimicrobials in food matrixes by shielding antimicrobials from contacting food matrix components and releasing them continuously. In this work, spray-dried capsules were produced from zein solutions with the same concentrations of nisin and thymol but with varying Tween 20 contents for characterization of release kinetics of antimicrobials and antilisterial properties. At intermediate levels of Tween 20, sustained and more complete release of antimicrobials was observed at pH 6.0 and 8.0. Most capsule samples were more effective than free antimicrobials against Listeria monocytogenes in 2% reduced fat milk, and the best capsule treatment reduced the bacterial population by 2 log CFU/mL more than comparable free antimicrobials after 4 h incubation at 25 °C. Our work demonstrated that nonionic surfactant can be conveniently used to modulate characteristics of delivery systems to effectively improve antimicrobial functions in food systems.
抗菌输送系统被提议作为一种潜在的解决方案，通过屏蔽抗菌剂与食品基质成分的接触并持续释放它们，来提高食品基质中抗菌剂的有效性。在这项工作中，使用相同浓度的乳链菌肽和百里香酚的玉米醇溶蛋白溶液制备喷雾干燥胶囊，以研究抗菌剂的释放动力学和抗李斯特菌特性。在吐温 20 的中等水平下，在 pH 值为 6.0 和 8.0 时观察到抗菌剂的持续和更完全的释放。在 2%减脂牛奶中，大多数胶囊样品比游离抗菌剂对单核细胞增生李斯特菌更有效，最佳的胶囊处理在 25°C 孵育 4 小时后，比可比的游离抗菌剂减少 2 个对数 CFU/mL 的细菌数量。我们的工作表明，非离子表面活性剂可以方便地用于调节输送系统的特性，从而有效地提高食品系统中的抗菌功能。
