Determination of Curdlan Oligosaccharides with High-Performance Anion Exchange Chromatography with Pulsed Amperometric Detection

作者：Cao, Lidong; Tian, Huifang; Wu, Miaomiao; Zhang, Hongjun; Zhou, Puguo^*; Huang, Qiliang^*

来源：Journal of Analytical Methods in Chemistry, 2018, 2018: 3980814.

DOI：10.1155/2018/3980814

The increasing interest of curdlan oligosaccharides (COS) in medicine and plant protection fields implies a necessity to identify and quantify this product. In the present study, an efficient and sensitive analytical method based on high-performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD) was established for the simultaneous separation and determination of D-glucose and ss-1,3-linked COS ranging from (COS)(2) to (COS)(6) within 20min. Detection limits were 0.01 to 0.03mg/L. The optimized assay was performed on a CarboPac-PA100 analytical column (4mmx250mm) using isocratic elution with water-0.2M sodium hydroxide-0.5M sodium acetate mixture (50:30:20, v/v/v) as the mobile phase at a flow rate of 0.8mL/min. Regression equations indicated a good linear relationship (R-2=0.9992-1.0000, n=6) within the test ranges. Quality parameters including precision and accuracy were fully validated and found to be satisfactory. More important, the regression of natural logarithm values of retention times (log(10) RT) versus the degree polymerization (DP), as well as the slope coefficient of each COS's linear equation versus the corresponding DP, fitted a linear relationship well. These inherent linear relationships could provide valuable information to tentatively identify and quantify the COS even with the DP more than 6 without authentic standard. Furthermore, when the log(10) RT was plotted against log(10) flow rate for each COS, a perfect linear relationship was also observed.

• 出版日期2018
• 单位北京大学; 中国农业科学院