双醛淀粉交联明胶的制备及溶胀性能

Preparation and Water Absorption of Dialdehyde Starch Cross-linked Gelatin

以双醛淀粉为交联剂,采用溶液交联的方法对明胶进行交联改性。研究了反应条件对交联明胶吸水性能的影响。结果表明,交联明胶吸水能力随双醛淀粉/明胶增加而先增加后降低,随反应温度增加而减小,随反应混合物pH值增加而增加。当pH=2,温度为90℃,双醛淀粉/明胶=0.3,明胶溶液浓度为20%时,明胶的吸水倍率可降低至1.62。FTIR显示双醛淀粉对明胶的交联作用主要是形成希夫碱结构。

Cross-linked gelatin was prepared with dialdehyde starch as crosslinking agent in aqueous solution. The effect of reaction conditions on water absorption of cross-linked gelatin was investegated. It was observed that the water adsorption capacity of dialdehyde starch cross-linked gelatin decreased with increasing dialdehyde starch/gelatin ratio, temperature and pH. A minimized water absorption capacity of 1.62 was achieved at optimized conditions of pH = 2, 90℃, while dialdehyde starch/gelatin= 0. 3 in 20% gelatin solution. The reaction between gelatin and dialdehyde starch has been characterized by the formation of schiff＇s base between dialdehyde starch and gelatin in FTIR spectrum.