摘要:
采用半湿研磨法制备了固体壳聚糖马来酸盐(Ch-Ma),并通过流延法制备了Ch-Ma膜,利用红外光谱、X-射线衍射光谱、紫外光谱、扫描电子显微镜等表征Ch-Ma和Ch-Ma膜的结构并测定其性能。结果表明,壳聚糖氨基与马来酸发生质子化成盐反应,使壳聚糖结晶度降低,改善了其溶解性能;在pH<9介质中,Ch-Ma展现良好的成膜性能,膜透光率大于90%。与壳聚糖醋酸盐(Ch-Ac)膜比较,Ch-Ma膜的结构疏松,孔隙率大;吸水性、吸湿性和水蒸气透过率小,具有更强的耐水性能;机械强度大,主要由于Ch-Ma膜中壳聚糖氨基质子化和π-π超分子作用。固体Ch-Ma制备方法简单、绿色,溶解性和成膜性好,有望扩宽壳聚糖衍生物的应用范围。
Abstract:
Chitosan maleic salt (Ch-Ma) was prepared by a semi-wet grinding method and the Ch-Ma film was prepared by casting method. The structure of Ch-Ma and its film were characterized by FT-IR spectroscopy, X-ray diffraction, ultraviolet spectroscopy and scanning electron microscopy. The physicochemical properties of Ch-Ma and its film were studied in detail. The results indicated that the salt was obtained by the protonation reaction of the amino group of chitosan and maleic acid, which caused the crystallinity of chitosan decreasing and improved its solubility. Ch-Ma showed good film-forming performance when the medium pH was less than 9. The light transmittance of Ch-Ma film was above 90%. Compared with Ch-Ac film, the structure of Ch-Ma film was looser, its porosity was higher, water absorption, moisture absorption and water vapor permeability were lower, water resistance was stronger and mechanical strength was higher, which might be due to the protonation of chitosan amino group and π-π stacking interaction. The preparation method of solid Ch-Ma was easy and sanitary. Ch-Ma had good solubility and film-forming performance, which was expected to broaden the application range of chitosan derivatives.
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