首页|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
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NSTL
Elsevier
? 2022 Elsevier B。V。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。
NSTL
Elsevier
