Summary
This in vitro study used bio-guided fractionation to characterise the anthelmintic compounds responsible for sainfoin's previously documented nematicidal activity. By separating sainfoin extracts using acetone/water solvent systems and molecular weight dialysis, the authors identified both condensed tannins and three specific flavonol glycosides (rutin, nicotiflorin, narcissin) as active against third-stage larvae of the ruminant gastrointestinal parasite Haemonchus contortus. The addition of polyvinyl pyrrolidone, a tannin-binding agent, to both fractions restored larval migration, confirming the functional role of phenolic compounds in sainfoin's anthelmintic properties.
Regional applicability
The findings are relevant to United Kingdom livestock farming, where Haemonchus contortus causes significant production losses in small ruminants. However, as an in vitro study, efficacy under UK field conditions and seasonal availability of sainfoin forage would require further investigation; sainfoin is not widely cultivated in the UK compared to continental Europe, though its cultivation is increasing for organic and regenerative farming systems.
Key measures
Larval migration inhibition (LMI) assay; solvent extraction profiles; molecular weight fractionation (2000 Da cut-off); identification of phenolic compounds; concentration-dependent inhibition at 1200 μg/ml
Outcomes reported
The study identified and characterised the biochemical nature of anthelmintic compounds in sainfoin (Onobrychis viciifolia) using bioassays against Haemonchus contortus larvae. The research demonstrated that both condensed tannins and specific flavonol glycosides (rutin, nicotiflorin, narcissin) inhibit larval migration in vitro.
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