Improvement of Hydrophobicity and Gas Permeability of the Polyvinyl Alcohol Film Utilizing Monoglyceride Coating and Diatomaceous Earth Filling and Its Application to Fresh-Cut Mango

作者：Liu, Fengsong; Li, Chenghao; Liu, Caiwei; Zheng, Jialin; Bian, Kaiyue; Bai, Hong; Zhang, Yan; Cao, Yifang; Xie, Yijia; Xiao, Xinglong^*

来源：ACS Sustainable Chemistry & Engineering, 2023, 11(29): 10938-10949.

DOI：10.1021/acssuschemeng.3c03149

• hydrophobic coating
• barrier properties
• roughness
• freshness quality

The widespread utilization of the polyvinyl alcohol (PVA)filmis significantly hindered by two prominent limitations: water sensitivityand low gas permeability. In this work, a novel PVA film coated withmonoglyceride (MG) and filled with diatomaceous earth (DS) was fabricatedto address these issues. Scanning electron microscopy and 3D morphologyrevealed that the R (a) value improved from3.72 to 7.21 & mu;m. Also, the successful coating of MG was confirmedby X-ray photoelectron spectroscopy and Fourier transform infraredspectroscopy. Pull-off adhesion tests proved that the film containing0.5 g of MG exhibited the highest adhesive properties. The PVA/MG/DSfilm had the highest contact angle of 122.32 & DEG;, the lowest watervapor permeability of 7.19 g/m(2)/day, and the lowest oxygenpermeability of 55.35 (cm(3) x cm x cm(2) x s x Pa)(-1). Moreover, this type offilm exhibited higher light transmittance, better thermal stability,and greater mechanical properties than pure PVA film. Consequently,the PVA/MG/DS film displayed superior performance in preserving thefreshness and quality of fresh-cut mango, with a lowest weight lossof 4.48%, a lowest total soluble solids of 7.98%, a greatest titratableacidity of 0.88%, a highest ascorbic acid of 76.67 mg/100 g, and bestsensory quality. @@@ Thehydrophobic coating of monoglyceride increased the hydrophobicityand diatomaceous earth improved the gas barrier permeability of thefilm.