Preparation of chitosan-PVA composite membranes containing phloretin and used as antioxidant film
TAO Haiyan1,2,3， ZHAO Lifeng1,2， CHEN Gang4， XIA Na5， JIA Shuping1,2， LI Shengbiao3
(1.College of Chemistry and Environmental Science， Kashi University， Kashgar， Xinjiang 844000， China；2.Xinjiang Laboratory of Medicinal and Edible Plant Resources Chemistry， Kashi University， Kashgar 844000， Xinjiang， China； 3.College of Chemistry， Central China Normal University， Wuhan 430079， China；4.Kashi Prefecture Fiber Inspection Institute， Kashgar， Xinjiang 844000， China；5.College of Life and Geographic Sciences， Kashi University， Kashgar， Xinjiang 844000， China)
Abstract：Chitosan-PVA composite film was widely applied in food packing due to biodegradability， bacteriostasis and excellent film-forming， but in the meantime， the inherent drawbacks such as poor barrier performance， low mechanical strength， low bacteriostasis and poor thermal stability limited the packing performance. In this paper， phloretin， a natural antioxidant， was used to modify the packing performance of chitosan-PVA composite film. Chitosan-PVA composite films with different concentration (0%， 1%， 2% and 3%， m/V) of phloretin were prepared by solution compounding method. The mechanical properties， water vapor transmission and structure were characterized in detail. The results show that the thermal stability， tensile strength and water vapor transmission of chitosan PVA composite membrane were obviously increased with the dosage increase of phloretin； in contrast， the break extension was decreased. The surface and cross section of the films were further studied by scanning electron microscopy (SEM). The FT-IR result showed that hydrogen bonds were formed in the film substrate. The XRD analysis exhibited that the phloretin has no effect on the amorphous property of chitosan-PVA composite film. The antioxidant activity (ABTS and DPPH radical scavenging ability and reducing ability) and antibacterial activity of chitosan-PVA composite films were significantly improved after adding phloretin. The research indicated that phloretin is an excellent additive， which would improve the properties of chitosan-PVA composite film and has potential value in the development of food packaging film.
2022, Vol. 56 
