Abstract
Dried leech (Whitmania pigra whitman) has been widely used as a traditional animal-based Chinese medicine. Dried leech extracts have been reported to have various biological activities that are often associated with mammalian glycosaminoglycans. However, their presence and possible structural characteristics within dried leech were previously unknown. In this study, glycosaminoglycans were isolated from dried leech for the first time and their structures were analyzed by the combination of Fourier-transform infrared spectroscopy, liquid chromatography-ion trap/time-of-flight mass spectrometry and polyacrylamide gel electrophoresis. Heparan sulfate and chondroitin sulfate/dermatan sulfate were detected in dried leech with varied disaccharide compositions and possess a heterogeneous structure. Heparan sulfate species possess an equal amount of total 2-O-sulfated, N-sulfated and acetylated disaccharides, while chondroitin sulfate /dermatan sulfate contain high content of 4-O-sulfated disaccharides. Also, the quantitative analysis revealed that the contents of heparan sulfate and chondroitin/dermatan sulfate in dried leech varied significantly, with chondroitin/dermatan sulfate being by far the most abundant. This novel structural information could help clarify the possible involvement of these polysaccharides in the biological activities of the dried leech. Furthermore, leech glycosaminoglycans showed a strong ABTS radical scavenging ability, which suggests the potential of leech polysaccharides for exploitation in the nutraceutical and pharmaceutical industries.
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Abbreviations
- ABST:
-
2,2’-azinobis-(3-ethylbenzthiazoline-6-sulphonate
- AMAC:
-
2-aminoacridone
- CS:
-
chondroitin sulfate
- DS:
-
dermatan sulfate
- EIC:
-
extracted ion chromatogram
- FTIR:
-
fourier-transform infrared
- GAG:
-
glycosaminoglycan
- GalNAc:
-
N-acetylgalatosamine
- GlcA:
-
glucuronate
- GlcNAc:
-
N-acetylglucosmine
- GlcNS:
-
N-sulfated glucosamine
- HA:
-
hyaluronic acid
- HP:
-
heparin
- HS:
-
heparan sulfate
- IdoA:
-
iduronate
- KS:
-
keratan sulphate
- LC-MS-ITTOF:
-
liquid chromatography-ion trap/time-of-flight mass spectrometry
- NaCl:
-
sodium chloride
- ΔUA:
-
4,5-unsaturated uronate (generated by heparinases and chondroitinase excision)
- PAGE:
-
polyacrylamide gel electrophoresis
- SE-HPLC:
-
size-exclusion HPLC
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This work was supported by Fuzhou University scientific research Grant (number 510866), and Education Department of Fujian Province Grant (number JAT200021).
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Shen, T., Wang, S., Liang, Q. et al. Characterization and antioxidant activities of glycosaminoglycans from dried leech. Glycoconj J 40, 169–178 (2023). https://doi.org/10.1007/s10719-023-10105-y
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DOI: https://doi.org/10.1007/s10719-023-10105-y