明胶/羧甲基纤维素钠涂膜液的改性及其对蓝莓贮藏性的影响.

[Objectives]This paper aimed to study the effects of nanomaterials and natural antimicrobial substances derived from microorganisms on gelatin-carboxymethyl cellulose sodium(CMC-Na)coating liquid and the effect of modified coating liquid on blueberry preservation, so as to provide technical guidance and theoretical basis for the preservation method of green coating film for fruits and vegetables. [Methods]Using gelatin/CMC-Na as the basic coating liquid, the modified coating liquid was prepared through L9(34)orthogonal design by adding modified nano-TiO2, ε-polylysine hydrochloride and natamycin, the physiological and fungistatic indicators of different coating liquid were observed and compared, and the best proportion of modified coating liquid was selected. The modified coating liquid was used for blueberries preservation, while some physicochemical properties and qualities were evaluated during storage at 0-3 ℃, relative humidity of 90%-95%. [Results]The optimal addition proportion of modified nano-TiO2, ε-polylysine hydrochloride and natamycin was 0.2, 0.15 and 0.3 g·L-1, respectively. The fungistatic rates of modified coating liquid on Botrytis cinerea and Colletotrichum gloeosporioides were 5.8 and 126.6 times that of the basic coating liquid, respectively. Compared with the basic coating liquid, the physical properties of the modified coating liquid improved, and the various substances were well fused, but no new chemical bonds formed, the water vapor transmission rate and water solubility were reduced, and the light transmittance slightly decreased; the gel performance enhanced and a more regular and dense network gel structure formed. The modified coating liquid coating treatment improved the hardness, soluble solid content and resistance-related enzyme activity, reduced the weight loss rate and decay rate of blueberries, and the low temperature storage period of blueberry was extended to 40 days. [Conclusions]By adding an appropriate proportion of modified nano-TiO2, ε-polylysine hydrochloride and natamycin, the structure of the gel formed by modified coating liquid changed, the physical properties of the coating film improved, and the antifungal properties enhanced. The modified coating liquid showed good storability of blueberries during cold storage. [ABSTRACT FROM AUTHOR]