de Menezes Francisco Leonardo Gomes, de Lima Leite Ricardo Henrique, Dos Santos Francisco Klebson Gomes, Aria Adrianus Indrat, Mendes Aroucha Edna Maria
Universidade Federal Rural do Semi-Arido, Brazil.
School of Aerospace, Transport, and Manufacturing, Cranfield University, United Kingdom.
Food Chem. 2024 Feb 1;433:137387. doi: 10.1016/j.foodchem.2023.137387. Epub 2023 Sep 4.
This work investigated the properties of chitosan-cassava starch biopolymeric films containing nanometric photoactive TiO particles for use in postharvest conservation of papaya fruits under UV light at a temperature of 15 ± 1 °C and a relative humidity of 90 ± 1 % for 24 days. Starch-chitosan blend films showed intermediate hydrophobicity and improved mechanical properties. The addition of 1 % TiO into the polymeric matrix of starch/chitosan (1:1) further improved the mechanical properties with solubility of 16.04 ± 0.41 %, visible transmittance of 31.76 ± 1.58 %, and reduced UV transmittance of more than 97 %. However, the addition of TiO exceeding 1 % led to the formation of agglomerates and excessive reduction in film transparency. UV exposure damaged the fruit peel and resulted in a higher weight loss. In contrast, the addition of 1 % TiO to the blend reduced the weight loss in light and dark by 7.12 ± 1.57 % and 5.27 ± 0.31 % respectively, and delayed fruit ripening.
本研究调查了含有纳米光活性TiO颗粒的壳聚糖-木薯淀粉生物聚合物薄膜的性能，该薄膜用于在15±1°C的温度和90±1%的相对湿度下，于紫外光下对番木瓜果实进行采后保鲜24天。淀粉-壳聚糖共混薄膜表现出中等疏水性和改善的机械性能。向淀粉/壳聚糖（1:1）的聚合物基质中添加1%的TiO进一步改善了机械性能，溶解度为16.04±0.41%，可见光透过率为31.76±1.58%，紫外线透过率降低超过97%。然而，TiO添加量超过1%会导致团聚物形成和薄膜透明度过度降低。紫外线照射会损害果皮并导致更高的重量损失。相比之下，向共混物中添加1%的TiO分别使光照和黑暗条件下的重量损失降低了7.12±1.57%和5.27±0.31%，并延缓了果实成熟。
