Abstract：
Sweet potato (Ipomonea batatas Lam) is easily damaged due to its thin skin, which is limited in shelf life and causes enormous economic losses in the food industry. A new type of safe, non-toxic, and edible antibacterial functional film was developed with sodium alginate (2.5 %), gum arabic (1 %), glycerol (2 %), and natamycin as an antimicrobial agent in this study. The physical and antibacterial properties of films, such as thickness, chromaticity, water vapor permeability, tensile strength, and elongation at break, were studied. Furthermore, the antibacterial film was applied in the preservation of sweet potatoes. The results showed that natamycin emulsion had good compatibility with sodium alginate. Besides reducing the transparency of the composite membrane, the mechanical properties, barrier properties, and thermal stability of the composite film were significantly enhanced by the addition of natamycin prepared by a pH-cycle method. When the concentration of natamycin in the membrane solution reached 40 μg/mL or more, the antibacterial film had a noticeable inhibitory effect on the growth of molds, and yeasts, significantly enhancing the bacteriostatic effect of the base film. During the sweet potatoes storage, the water content, total starch content, Vc content, and flavonoid glycoside content of sweet potato showed a downward trend. However, the treatment of antibacterial film containing natamycin could slow down the physiological and quality changes of sweet potatoes during conventional storage, and the sweet potatoes still had good processing quality after 120 days of storage.
摘要：
甘薯（IpomoneabatatasLam）由于皮肤薄而容易受损，保质期有限，在食品工业中造成巨大的经济损失。一种新型的保险箱,无毒,用海藻酸钠(2.5%)研制了可食用抗菌功能膜，阿拉伯树胶（1%），甘油（2%），和纳他霉素作为抗菌剂在这项研究中。薄膜的物理和抗菌性能，如厚度，色度,水蒸气渗透性，抗拉强度,和断裂伸长率，被研究过。此外，该抗菌膜应用于红薯的保鲜。结果表明，纳他霉素乳剂与海藻酸钠具有良好的相容性。除了降低复合膜的透明度，机械性能，阻隔性能,通过添加pH循环法制备的纳他霉素，可以显着提高复合膜的热稳定性。当膜溶液中游霉素的浓度达到40μg/mL以上时，抗菌膜对霉菌的生长有明显的抑制作用,和酵母，显著增强基膜的抑菌效果。在红薯储存期间，含水量,总淀粉含量，VC含量,甘薯黄酮苷含量呈下降趋势。然而,含那他霉素的抗菌膜处理可以减缓红薯在常规贮藏过程中的生理和品质变化，红薯经过120天的储存，加工质量仍然很好。
