硫酸氨基葡萄糖吸湿性研究

Studies on the hygroscopicity of glucosamine sulfate powder

目的对硫酸氨基葡萄糖进行吸湿性研究。方法应用静态法在5℃,30℃条件下对硫酸氨基葡萄糖粉末进行了吸湿性研究,测定其平衡含水率,并绘制吸湿等温线。利用BET方程对实验结果进行回归分析,计算单层水分含量。结果30℃时,当aw超过0.43时,样品结块变色并开始失去其所吸附的水分,平衡含水量下降;5℃时的吸附等温线为经典的反S型,平衡含水量随水分活度的增加逐渐增加。30℃,5℃的单层水分含量分别为4.8633,5.5740g/100g。结论在5℃,30℃时应当将硫酸氨基葡萄糖分别保存在水分活度0.3056,0.2784以下。

Objective To study the hygroscopicity of glucosamine sulfate powder. Methods Hy-groscopic studies were conducted on glucosamine sulfate powder at 5℃ and 30℃ used gravimetric method, determined the equilibrium moisture content （EMC） and drew the moisture sorption isotherms. The experimerital values were regressed using the BET model, calculated the monolayer moisture content. Results At 30℃, when water activity exceeded 0.43, samples agglomerated, browned and lose adsorbed water, EMC declined; At 5℃, the isotherm had typical ob-S shape, the EMC increased with water activity raising. At 30℃ and 5 ℃, the monolayer moisture content were 4. 8633,5. 5740g/100g respectively. Conclusion At 5,30℃ the appropriate aw for storage appeared to be below 0. 3056,0. 2784, respectively.