[Preliminary studies on physicochemical properties of Angelica sinensis polysaccharide-iron complex].

Objective: To study some physicochemical properties of Angelica sinensis polysaccharide-iron complex(APC).Method: Based on the qualitatively identified reactions of iron(Ⅲ),the qualitatively identified reactions of APC were found out by comparing with ferric hydroxide.The content of iron(Ⅲ) in APC was determined with iodometry.The stability of APC under physiological pH conditions was judged by titrating APC with sodium hydroxide.The deoxidization of APC was tested with colorimetric analysis.Result: APC showed the qualitatively identified reactions of iron(Ⅲ).The content of iron(Ⅲ) in APC ranged from 10% to 40%,and the water-solubility of APC was related to the content of iron(Ⅲ).The complex was stable at physiological pH from3 to 12,without precipitation and dissociation.At 37 ℃,Fe(Ⅲ) in the complex was completely reduced to Fe(Ⅱ) by ascorbic acid in about 6 hours.Conclusion: APC can be qualitatively identified by using the qualitatively identified reactions of iron(Ⅲ). When its iron(Ⅲ) content is within 20%-25%,APC has a better ability to dissolve in water.And the complex is stable under physiological pH conditions.