添加巴西甜橙油对壳聚糖膜性质的影响

Effect of Incorporation of Brazil Sweet Orange Oil on Properties of Chitosan Films

使用浇铸-蒸发-碱浸法制备壳聚糖-巴西甜橙油复合膜,采用红外光谱、X射线衍射对复合膜进行表征,考察巴西甜橙油添加量对膜的厚度、拉伸强度、断裂伸长率、接触角、水蒸气透过系数、总溶解物质量分数、溶胀指数等性质的影响。结果表明:巴西甜橙油占据了壳聚糖骨架中的部分官能团的位置,打乱了壳聚糖骨架的有序性,使膜中壳聚糖乙酸盐的含量增大。巴西甜橙油添加量为2%时,膜的断裂伸长率取得最大值(10.07%)。膜的接触角和总溶解物质量分数随着巴西甜橙油添加量的增加而增大,最大值分别为81.15°和4.24%。膜的水蒸气透过系数在巴西甜橙油添加量为6%时最小,为313.32 mg?mm/(k Pa?h?m2)。壳聚糖-巴西甜橙油(8%)复合膜的溶胀指数最小,为0.49。巴西甜橙油的加入改善了由浇铸-蒸发-碱浸法制备的壳聚糖膜的力学性质和物理性质,研究结果可为壳聚糖-巴西甜橙油复合膜的生产和应用提供技术依据。

Chitosan-Brazil sweet orange oil composite films were prepared with chitosan(CS) and Brazil sweet orange oil(BSOO) by a casting-evaporation-alkali leaching method.Microstructural properties of the films were characterized by Fourier transform infrared reflectance spectroscopy(FTIR) and X-ray diffraction(XRD).The effect of BSOO content on film thickness,tensile strength(TS),elongation at break(E),contact angle(CA),water vapor permeability(WVA),total soluble matter content(TSMC) and swelling index(SI) were investigated.The results indicated that the locations of partial functional groups of CS matrix were occupied by BSOO.The regularity of CS matrix was decreased by the incorporation of BSOO,resulting in the increasing content of chitosan-acetate in films.When BSOO content was 2%,E reached the minimum value,10.07%.CA and TSMC of films increased with increasing BSOO content,and maximum CA and TSMC were81.15° and 4.24%,respectively.When BSOO content was 6%,WVP attained the maximum level of313.32 mg·mm/(kPa·h·m2).Minimum SI(0.49) was achieved for 8%CS-BSOO film.The incorporated BSOO improved the physical and mechanical properties of chitosan-based composite films prepared by casting-evaporation-alkali leaching method.The research results could provide a technical basis for the production and application of CS-BSOO composite films.