Chemical Engineering Department, Federal University of Ceara, Campus Pici, 60455-760 Fortaleza, CE, Brazil.
Embrapa Agroindústria Tropical, R Dra Sara Mesquita, 2270, 60511-110 Fortaleza, CE, Brazil.
Food Chem. 2018 Aug 15;257:252-258. doi: 10.1016/j.foodchem.2018.03.021. Epub 2018 Mar 8.
The quality of zein (Z)- and zein-tannic acid (ZTA)-coated guavas was monitored throughout 12 days of storage. Coated fruit showed lower changes in terms of visual appearance, chlorophyll contents and color. Weight loss, softening, and changes in soluble solids were also decreased by the coatings. The respiration peak as well as HO and superoxide dismutase activity peaks were delayed by the coatings, and the ethylene production was reduced. So, the results were consistent with a slowed down ripening of guavas by the coatings, which was probably related to lowered oxygen permeability of guava skin. ZTA coating was more effective than Z to reduce weight loss, softening, color changes, ethylene production, and oxidative stress. The higher efficiency of ZTA coating was ascribed to zein crosslinking, which probably resulted in decreased gas permeability, promoting lower respiration rates and lower ROS production, slowing down the ripening process, and extending guava stability.
在 12 天的贮藏期内，监测了玉米醇溶蛋白（Z）和玉米醇溶蛋白-单宁酸（ZTA）涂层木瓜的质量。涂层水果在外观、叶绿素含量和颜色方面的变化较小。涂层还降低了失重、软化和可溶性固形物的变化。涂层延迟了呼吸峰以及 HO 和超氧化物歧化酶活性峰的出现，并降低了乙烯的产生。因此，结果表明涂层可以减缓木瓜的成熟，这可能与降低了木瓜皮的氧气渗透性有关。ZTA 涂层比 Z 更有效地减少失重、软化、颜色变化、乙烯产生和氧化应激。ZTA 涂层的更高效率归因于玉米醇溶蛋白的交联，这可能导致气体渗透性降低，从而降低呼吸速率和 ROS 产生，减缓成熟过程，延长木瓜的稳定性。
