Convenient, nondestructive monitoring and sustained-release of ethephon/chitosan film for on-demand of fruit ripening
Convenient, nondestructive monitoring and sustained-release of ethephon/chitosan film for on-demand of fruit ripening
复制标题
方便、无损监测和缓释乙烯利/壳聚糖薄膜，按需催熟果实
DOI：
10.1016/j.ijbiomac.2022.06.086
复制
发表时间：
2022
影响因子：
8.2
通讯作者：
Baofeng Lin
中科院分区：
文献类型：
--
作者：
Yuan Yao;Yongfu Deng;Yuntong Liang;Xiaoxing Li;Xiuzhen Tang;Minjie Lin;Chuanhui Xu;Lihua Fu;Baofeng Lin
微观结构的变化（如微观缺陷和自由体积等）是决定聚合物膜缓释行为的深层因素。然而，目前对缓释材料微观缺陷的研究报道较少。本研究发展了一种简便的方法，可用于壳聚糖内乙烯的非破坏性监测和缓释。采用正电子湮没寿命谱、原子力显微镜和拉曼光谱等综合手段，研究了乙烯缓释过程中微结构的变化及其机理。当乙烯存在于壳聚糖膜中时，壳聚糖膜表现出良好的催熟性能和力学性能。缓释乙烯提高了其生物利用度，可按需控制果实成熟。更重要的是，空穴的微观结构变化对乙烯的持续释放有显著影响，由于空穴的产生，正电子的自由体积经历了一个由少到多再逐渐减小的过程，在120 h时达到最大值。此外，乙烯利/壳聚糖膜可以按需控制芒果和香蕉的成熟时间。因此，本研究为微结构变化监测和可控缓释研究提供了一种综合手段，为解决水果按需成熟和降低农药残留提供了可能。ETH/CS膜的缓释机理及其在水果按需催熟中的应用·成功地建立了一种简单的无损监测和壳聚糖中乙烯缓释的方法。·缓释乙烯提高了其生物利用度，可按需控制果实成熟。·同时进行帕尔斯、AFM和拉曼光谱，用于乙烯缓释的非破坏性监测。发现了微缺陷、正电子自由体积等微观结构对乙烯释放的影响规律。
The microstructure changes (such as micro defects and free volume, etc.) is a deep factor that determines the sustained release behavior of polymer film. However, there are few reports exploring the micro defects of sustained-release materials. Herein, we develop a facile method to non-destructive monitoring and sustained-release ethylene within chitosan. The comprehensive means of positron annihilation lifetime spectroscopy, atomic force microscopy and Raman spectrums are performed together to study the microstructures change of ethylene sustained-release and its mechanism. When ethylene is in chitosan film, it shows good ripening performance and mechanical properties. The sustained-release ethylene improves its bioavailability and can control the fruit-ripening on-demand. More importantly, the microstructural changes of cavities have a significant impact on the sustained release of ethylene, due to the creation of cavities, the free volume of positrons undergoes a process of increasing from less to more and then gradually decreasing, reaching a maximum at 120 h. Furthermore, the ethephon/chitosan film could on-demand control the ripening time of mangoes and bananas. Therefore, this research presents a comprehensive means to study of microstructure change monitoring and controllable sustained release, and provides the possibility to solve the problem of on-demand ripening of fruit and reducing pesticide residue. Sustained-release mechanism of ETH/CS film and its application in on-demand fruit ripening. • A facile method to nondestructive monitoring and sustained-release ethylene within chitosan is successfully developed. • The sustained-release ethylene improves its bioavailability and can control the fruit-ripening on-demand. • PALS, AFM and Raman spectrums are performed together for non-destructive monitoring of ethylene sustained-release. • The influence rule of microstructure such as microdefects and free volume of positrons on the release of ethylene is found.