title: Effect of molecular weight and concentration of legume condensed tannins on in vitro larval migration inhibition of Haemonchus contortus.
abstract: The effect of molecular weight of condensed tannins (CT) from a variety of warm-season perennial legumes commonly consumed by sheep and goats on anthelmintic activity has not been previously explored. The objectives of this study were to determine if molecular weight of CT from warm-season perennial legumes could predict the biological activity of CT relative to anthelmintic activity against ivermectin resistant L3 stage Haemonchus contortus (HC) using a larval migration inhibition (LMI) assay. A second objective was to determine if CT from warm-season perennial legumes possess anthelmintic properties against L3 stage (HC). Lespedeza stuevei had the greatest concentration of total condensed tannin (TCT; 11.7%), whereas, with the exception of Arachis glabrata, a CT-free negative control, Leucaena retusa had the least TCT (3.3%). Weight-average molecular weight of CT ranged from 552 Da for L. stuevei to 1483 Da for Lespedeza cuneata. The treatments demonstrating the greatest percent LMI were L. retusa, L. stuevei and Acacia angustissima var. hirta (65.4%, 63.1% and 42.2%, respectively). The ivermectin treatment had the smallest percent LMI (12.5%) against ivermectin resistant L3 HC. There was a weak correlation (R(2)=0.34; P=0.05) between CT MW and percent LMI, suggesting that molecular weight of CT is a weak contributing factor to CT biological activity as it relates to LMI of L3 stage HC. L. stuevei, L. retusa and A. angustissima var. hirta STP5 warrant further evaluation of anthelmintic properties in vivo.
authors.affiliation: Texas A&M University, Soil and Crop Sciences Department, 2474 TAMU, College Station, TX 77843, USA; Texas A&M AgriLife Research, 1229 North US Highway 281, Stephenville, TX 76401, USA. Electronic address: hnaumann@tamu.edu.
authors.forename: H D
authors.initials: HD
authors.lastname: Naumann
authors.forename: S A
authors.initials: SA
authors.lastname: Armstrong
authors.forename: B D
authors.initials: BD
authors.lastname: Lambert
authors.forename: J P
authors.initials: JP
authors.lastname: Muir
authors.forename: L O
authors.initials: LO
authors.lastname: Tedeschi
authors.forename: M M
authors.initials: MM
authors.lastname: Kothmann
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000494:pharmacology*; D004351:Drug Resistance / Q000187:drug effects; D007887:Fabaceae / Q000737:chemistry*; D015511:Goat Diseases / Q000469:parasitology*; D006041:Goats; D006188:Haemonchiasis / Q000662:veterinary*; D006189:Haemonchus / Q000187:drug effects*; D007814:Larva / Q000187:drug effects; D008970:Molecular Weight; D010936:Plant Extracts / Q000032:analysis / Q000737:chemistry* / Q000494:pharmacology*; D013634:Tannins / Q000032:analysis / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000871:Anthelmintics; D010936:Plant Extracts; D013634:Tannins
keywords: Anthelmintic; Condensed tannins; Haemonchus contortus; Legumes; Molecular weight