Abstract Hexanal extends the shelf life of fresh produce. Due to its high volatility and spontaneous oxidation, control release of hexanal is a challenge. The objective of the study was to stabilize and encapsulate hexanal as an acid labile precursor in polymeric nonwovens and trigger its release in moisture environments in packaged fresh produce. Bilayer nonwovens were prepared by encapsulating hexanal precursor and citric acid (CA) (1, 5, 10 % (w/w)) in a mixture of ethylcellulose/poly(ethylene oxide) polymers. The hexanal (10 % (w/w)) was stabilized by forming a precursor compound via condensation with N,N’-dibenzylethane-1,2-diamine through a Schiff base reaction. The release of the hexanal from the nonwovens was studied at 0, 75 and 100 % relative humidity (RH) using gas chromatography. Fourier transform infrared spectroscopy and scanning electron microscopy confirmed the presence of CA and hexanal in the nonwovens. The highest hexanal release was attained in the 10 % (w/w) CA nonwovens under 75 % RH after 6 h of study. The efficacy of the encapsulated hexanal precursor nonwovens containing 10 % (w/w) CA to delay the ripening of papaya fruits stored at 22 ± 1.5 °C was assessed during a 14-day storage period. The shelf life of papaya fruits was extended for 4 days relative to the control samples. The hexanal treated samples significantly (p

中文翻译：

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从包封在乙基纤维素/聚（环氧乙烷）无纺布中的咪唑烷前体中水分活化释放己醛以延长木瓜的保质期

摘要 己醛延长了新鲜农产品的保质期。由于其高挥发性和自发氧化，己醛的控制释放是一个挑战。该研究的目的是在聚合物非织造布中稳定和封装作为酸不稳定前体的己醛，并在包装​​的新鲜农产品中触发其在潮湿环境中的释放。双层非织造布是通过将己醛前体和柠檬酸 (CA)（1、5、10%（w/w））封装在乙基纤维素/聚（环氧乙烷）聚合物的混合物中来制备的。通过席夫碱反应与 N,N'-二苄基乙烷-1,2-二胺缩合形成前体化合物来稳定己醛 (10% (w/w))。使用气相色谱法在 0、75 和 100% 相对湿度 (RH) 下研究了非织造布中己醛的释放。傅里叶变换红外光谱和扫描电子显微镜证实了非织造布中存在 CA 和己醛。研究 6 小时后，在 75% RH 下，10% (w/w) CA 非织造布的己醛释放量最高。在 14 天的储存期内评估了含有 10% (w/w) CA 的封装的己醛前体非织造布延迟储存在 22 ± 1.5 °C 下的木瓜果实成熟的功效。相对于对照样品，木瓜果实的保质期延长了 4 天。己醛处理的样品显着 (p 在 14 天的储存期内评估了含有 10% (w/w) CA 的封装的己醛前体非织造布延迟储存在 22 ± 1.5 °C 下的木瓜果实成熟的功效。相对于对照样品，木瓜果实的保质期延长了 4 天。己醛处理的样品显着 (p 在 14 天的储存期内评估了含有 10% (w/w) CA 的封装的己醛前体非织造布延迟储存在 22 ± 1.5 °C 下的木瓜果实成熟的功效。相对于对照样品，木瓜果实的保质期延长了 4 天。己醛处理的样品显着 (p