Abstract
Two water-soluble glucans (designated APS-1cI and APS-1cII) were extracted from the roots of Angelica sinensis (Oliv.) Diels and further purified by anion-exchange and gel-filtration chromatography. Their molecular weights were determined to be 1.7 × 10 5 and 3.9 × 10 4 Da, respectively. The structures of the purified glucans were investigated by a combination of chemical and instrumental analysis, such as methylation analysis, periodate oxidation, GC–MS, as well as FTIR and NMR spectroscopy ( 1H, 13C, H–H COSY, HSQC, HMBC, TOCSY and NOESY). The data obtained indicated that APS-1cI was a linear α-glucan composed of only (1→6)-α- d-Glc p, and APS-1cII had a repeating unit consisting of (1→4)-α- d-Glc p and (1→6)-α- d-Glc p in a molar ratio of 4:1. Such glucans isolated from A. sinensis (Oliv.) Diels have not been previously reported.
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