【摘要】 采用流延法制备含不同浓度茶多酚的淀粉可食性膜,对其性能进行表征,以期得到具有一定功能活性的薄膜.结果表明:茶多酚对薄膜的表面结构和水分含量无显著影响;薄膜透明度和接触角随茶多酚含量增加而显著减小;当茶多酚含量为5%时,薄膜具有较好的机械性能和较低的水蒸气透过性;与纯淀粉膜相比,茶多酚/淀粉膜有助于延缓鱼油氧化,可有效抑制金黄色葡萄球菌和大肠杆菌的生长;在抑菌试验中,基于计算机视觉和机器学习技术建立的自动菌落计数技术能够准确、高效地进行菌落计数.更多还原

【Abstract】 Starch-based films incorporated with different concentration of tea polyphenols( TP) were developed with the aid of solution casting method. The physical and functional properties of the films were systematically characterized. The results shows that the TP produces no significant effect on the surface and moisture content of the films,but it reduces the transparency and contact angle. It is also noted that,the mechanical properties and water vapor permeability of the film show no linear changes with the increase of the content of TP. In addition,the presence of TP increases the antioxidant and antimicrobial activity of the starch-based films,and the inhibitory effect is more evident against Staphylococcus aureus. In the antibacterial test,a new automatic counting method based on computer vision and machine learning algorithm is established to count the colonies,which perform much faster without subjective uncertainty.更多还原