Fe-TiO_(2)光催化降解乙烯及其影响樱桃番茄果实采后后熟的应用初探  

Photocatalytic degradation of ethylene by Fe-doped TiO_(2) and effect on postharvest ripening of cherry tomato

作　　者：张文瑜 赵敏孜 曾凯芳[1,2,3] 阮长晴 ZHANG Wenyu;ZHAO Minzi;ZENG Kaifang;RUAN Changqing(College of Food Science,Southwest University,Chongqing 400715,China;Chongqing Key Laboratory of Specialty Food Co-Built by Sichuan and Chongqing,Chongqing 400715,China;Research Center of Food Storage and Logistics,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学食品科学学院,重庆400715 [2]川渝共建特色食品重庆市重点实验室,重庆400715 [3]西南大学食品贮藏与物流研究中心,重庆400715

出　　处：《食品与发酵工业》2024年第21期273-279,共7页Food and Fermentation Industries

基　　金：国家自然科学基金面上项目(32372394)。

摘　　要：樱桃番茄属于呼吸跃变型果蔬,采后易受乙烯影响加速果实的呼吸作用和后熟进程,严重缩短果实货架期。因此,开发可清除樱桃番茄采后环境中乙烯的包装材料,对于减少果实采后因乙烯催熟而引起的经济损失有重要的现实意义。该研究采用煅烧法制得一种在可见光照射条件下具有光催化活性的铁掺杂二氧化钛光催化剂(Fe-TiO_(2)),与纯二氧化钛(TiO_(2))纳米颗粒相比,Fe-TiO_(2)禁带宽度减小、光生电子-空穴对复合率降低,在LED灯光照条件下乙烯降解率大幅度提高。将其通过涂膜处理应用于樱桃番茄采后保鲜中,以果实表面色泽的变化判断其后熟进程,探究在LED灯光照条件下Fe-TiO_(2)对樱桃番茄采后后熟的影响。结果表明,与对照组相比,LED灯光照下,Fe-TiO_(2)负载于聚乙烯醇中的涂膜处理有效减缓樱桃番茄绿熟果实转红的速度,约推迟4 d,显著延缓果实采后后熟进程,初步展示光催化降解乙烯在果蔬采后保鲜上的应用前景。Cherry tomato,a kind of climacteric fruit,is easily affected by ethylene after harvest to accelerate its respiration,thereby promoting ripening and seriously shortening its shelf life.Therefore,developing novel packaging materials and technology for removing ethylene from the postharvest environment of cherry tomatoes shows important practical significance in reducing the economic losses caused by ethylene-induced ripening of postharvest fruits.This study used a calcination method to prepare a kind of photocatalyst of Fe-doped titanium dioxide nanoparticle(Fe-TiO_(2))which might show photocatalytic activities under visible light irradiation.Compared with pure TiO_(2) nanoparticles,the band gap width of Fe-TiO_(2) decreased,the recombination rate of photogenerated electron-hole pairs decreased,and the ethylene degradation rate significantly increased under LED light irradiation.This study applied this technology of photocatalysis in the postharvest preservation of cherry tomatoes by detecting the variation of key indicators of fruit surface color to determine the postharvest ripening process and explored the effect of Fe-TiO_(2) loaded by polyvinyl alcohol(Fe-TiO_(2)/PVA)and coated on fruit surface on cherry tomato postharvest ripening under LED light irradiation.The results showed that compared with the control group,the Fe-TiO_(2)/PVA coating treatment could effectively control the changes in fruit color from green to red,delaying about 4 days,and delaying the postharvest ripening process of the fruit.This study preliminarily demonstrated the application prospect of photocatalytic.

关 键 词：铁掺杂二氧化钛 光催化剂 乙烯降解 樱桃番茄 延缓成熟 

分 类 号：TS255.3[轻工技术与工程—农产品加工及贮藏工程]