Precise structural characterization and therapeutic potential of a glucomannan polysaccharide from dried rhizome of plant Bletilla striata against ulcerative colitis.
Hou H, Li L, Islam T, Shi J, Hou M
Medicinal Plants
Hardy orchid (Bletilla striata) — the pleated-leaf, magenta-flowered plant already thriving in shaded temperate garden borders — stores a precisely mapped gut-healing compound in its tubers that outperformed expectations in mice with inflammatory bowel disease, putting a common ornamental squarely at the intersection of ethnobotany and emerging therapeutics.
Bletilla striata is a garden orchid whose underground roots have been used in Chinese herbal medicine for generations. Scientists carefully extracted a specific complex sugar from those roots, mapped its exact molecular shape for the first time, and fed it to mice with gut inflammation. The results were striking: the mice healed faster, grew more beneficial gut bacteria, and produced more of a fatty acid linked to intestinal health — all at doses that scaled predictably.
Key Findings
The glucomannan BSPN constitutes ~80% of total polysaccharide in Bletilla striata tubers, with a mannose-to-glucose ratio of 4:1 and molecular weight of 178 kDa — now fully structurally characterized for the first time.
BSPN significantly alleviated ulcerative colitis in mice in a dose-dependent manner, improving colon tissue integrity and upregulating gut enzyme genes (GH1/GH2).
Treatment boosted valeric acid levels by 69% and enriched beneficial gut bacteria including Faecalibaculum, Bacteroides, and Bifidobacterium species.
chevron_right Technical Summary
Scientists extracted and precisely mapped a complex sugar molecule (glucomannan) from the underground tubers of Bletilla striata, a traditional Chinese medicinal orchid, and showed it significantly reduced gut inflammation in mice — offering a molecularly characterized candidate for treating ulcerative colitis.
Abstract Preview
Bletillae Rhizoma (Baiji), the dried tuber of Bletilla striata (Thunb.) Reichb.f. (BS), a traditional medicinal plant widely used in Chinese medicine. While polysaccharides from BS tuber (BSP) have...
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