This study aimed to investigate the differences in polysaccharides in Astragali Radix (AR) from different sources, as well as before and after honey processing, through the analysis of enzymatic hydrolysates. The hydrolysis product of astragalus polysaccharides (APS) by β-galactosidase was characterized using hydrophilic interaction ultra-high-performance liquid chromatography coupled with time-of-flight mass spectrometry (HILIC-UHPLC-QTOF/MS). The results indicated that all oligosaccharide fragments were composed of hexoses, with sugar groups linked by 1,6-glycosidic bonds. APS enzymatic hydrolysates fingerprints were established using hydrophilic interaction high-performance liquid chromatography with an evaporative light scattering detector (HILIC-HPLC-ELSD) and comprehensively evaluated based on their similarity. Semi-quantitative analysis of each enzymatic hydrolysate was performed, combined with partial least squares discriminant analysis (PLS-DA) and significance testing to further analyze the main differential sugar fragments of AR in different growth modes and before and after honey processing. Glucose and oligosaccharides with degree of polymerization (DP) of 5 and 6 were identified as indicators to distinguish different growth modes. Glucose can serve as an indicator to distinguish raw AR from honey-processed AR (HAR). This study identified quality evaluation indicators of APS based on saccharide mapping, providing a reference for the development of quality standards for AR.
The aim of the present study was to compare the enantioseparation performance of chiral stationary phases (CSPs) which were derived from chitosans of different sources and molecular weights. Therefore, chitosans of shrimp and crab shells were prepared. The viscosity-average molecular weights of the chitosans both prepared from shrimp and crab shells were 2.8 × 10 5 and 1.4 × 10 5 . The chitosans were isobutyrylated yielding isopropylcarbonyl chitosans which were then derivatized with 4-methylphenyl isocyanate to provide chitosan 3,6-bis(4-methylphenylcarbamate)-2-(isobutyrylamide)s. The chitosan 3,6-bis(4-methylphenylcarbamate)-2-(isobutyrylamide)s were used as chiral selectors (CSs) with which the corresponding CSPs were prepared. With the same chiral analytes and under the same mobile phase conditions, the enantioseparation capability of the CSPs was evaluated by high-performance liquid chromatography. In two CSs prepared from the same source, the one with higher molecular weight showed better enantioseparation capability; in two CSs prepared with the chitosans of the same molecular weight, the one derived from shrimp shell exhibited better performance. With regard to the two shrimp chitosan CSs, most of chiral analytes interacted more strongly with the one with lower molecular weight, and an opposite trend was found for the two crab chitosan CSs. Based on the results observed in the present study and in previous work, we believe that the influence of molecular weight on CSP enantioseparation performance is related to the substituent introduced in the CS molecule.
危险品化学品经营许可证（带存储）