载银壳聚糖的制备及其对薄木抗菌处理的研究∗

摘要

Chitosan (CTS)and AgNO3 solution were used to prepare antibacterial agent,i.e.silver-carried chi-tosan(CTS-Ag),by reacting under dark,heating and acid conditions,and their resulted morphology,struc-ture,and chemical groups were obtained by using SEM,FT-IR,XRD and elemental analyzer.The antibacterial property of CTS-Ag treated veneers with impregnating in normal temperature and pressure were specific evalua-ted by colony counting method.A CIE L∗a∗b∗ (1976)color system investigated the effect of CTS-Ag on ve-neer’s colors.The results showed that:coordination reaction took place between —NH2 and Ag+(ratio 2∶1), generating CTS-Ag.The crystallinity of CTS were decreased obviously,while the antibacterial properties of CTS-Ag were superior to CTS or Ag+.CTS-Ag could improve the light resistance of Ag+,it had no significant influence on the color for veneer.%以壳聚糖(以下简称为 CTS)和 AgNO3为原材料,在酸性条件下,避光加热制得载银壳聚糖(以下简称为 CTS-Ag),运用 SEM、FT-IR、XRD、元素分析仪分析其形貌、结构、化学基团；采用常温常压浸渍法制得CTS-Ag抗菌薄木,运用菌落计数法定量表征其抗菌性能,并以 CIE L∗a∗b∗(1976)表色系统评价CTS-Ag对薄木颜色的影响。结果表明,CTS 分子中—NH2与Ag+发生配位反应生成 CTS-Ag,配位比为2∶1；CTS 与 Ag+结合使得结晶度下降；CTS-Ag抗菌性能显著,优于单一组分的 CTS 与 Ag+抗菌剂；CTS-Ag明显提高了 Ag+耐光性,对处理材本身颜色的影响较小。