黄皮多糖/壳聚糖复合可食膜的制备、结构表征及理化性质

Preparation, Structural Characterization and Physicochemical Properties of Wampee Polysaccharide/Chitosan Composite Edible Film

摘要:

采用水提醇沉法提取黄皮多糖（WSP-W）并将其同壳聚糖复合，制备成WSP-W/壳聚糖复合可食膜，初步测定WSP-W分子量、化学组成、红外光谱，并且考察WSP-W对壳聚糖复合可食膜的影响。结果表明，WSP-W是一种典型的均一多糖，分子量为1.6×103 ku。复合膜的FT-IR中壳聚糖分子的氨基带从1 560.1 cm-1移动到了1 571.7 cm-1，表明WSP-W和壳聚糖之间存在相互作用力。与单一壳聚糖膜相比，复合膜的厚度、水溶解性、溶胀率增加，水分含量降低。在光学透过率方面，波长小于500 nm时，复合膜的紫外阻隔能力较强。机械性能的研究结果显示，在WSP-W添加量为12%时，拉伸强度和断裂伸长率均达到最大值，分别为30.13 MPa和29.93%。水蒸气透过率在WSP-W 12%时达24.54g•mm/(m2•d•kPa)，在WSP-W 6%时，阻油性能达96.24 g•mm/(m2•d)。DSC结果表明，复合膜的热稳定性更佳。DPPH自由基清除率和羟基自由基清除率（最大达99.85%）结果表明WSP-W可以提高复合膜的抗氧化活性。综上所述，WSP-W的加入能够改善单一壳聚糖膜的光学性能、力学性能、阻隔性能、抗氧化性，可为黄皮多糖的开发利用提供一定的参考。

Abstract:

Water-soluble polysaccharide from wampee (WSP-W) was prepared through water extraction then precipitation by ethanol, and compounded with chitosan to make WSP-W/chitosan composite edible films. The molecular weight, chemical composition and infrared spectrum of WSP-W were preliminarily examined, and the effect of WSP-W on the WSP-W/chitosan composite edible film was investigated. The results showed that WSP-W was a typical homogeneous polysaccharide, with a molecular weight of 1.6×103 ku. When different concentrations of WSP-W were added, fourier transform infrared spectroscopy demonstrated that The amino band of chitosan molecule in FT-IR spectra shifted from 1 560.1 cm-1 to 1 571.7 cm-1 for the composite film, indicating that there was an interaction between WSP-W and chitosan. Compared with the film made with chitosan singly, the composite films exhibited increased thickness, water solubility and swelling rate but a decreased moisture content. In terms of optical transmittance, the composite films showed strong UV barrier capability at a wavelength below 500 nm. The results of the mechanical property tests showed that when the WSP-W content was 12%, the tensile strength and elongation at break reached the maximum (30.13 MPa and 29.93%, respectively). The water vapor permeability reached 24.54 g•mm/(m2•d•kPa) when WSP-W was 12%, and the oil resistance capacity reached 96.24 g•mm/(m2•d) when WSP-W was 6%. DSC results revealed that the thermal stability of the composite films was better. The results of the DPPH and hydroxyl radical scavenging rates showed that WSP-W could improve the film’s antioxidant activity. In summary, the addition of WSP-W can improve the optical, mechanical, barrie and antioxidant properties of chitosan film, which can provide a certain reference for the development and utilization of WSP.