Relationships between Structures of Condensed Tannins from Texas Legumes and Methane Production During In Vitro Rumen Digestion

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
H D NaumannAnn E Hagerman

Abstract

Previous studies showed that a series of purified condensed tannins (CTs) from warm-season perennial legumes exhibited high variability in their modulation of methane production during in vitro rumen digestion. The molecular weight differences between these CTs did not provide correlation with either the in vitro CH₄ production or the ability to precipitate bovine serum albumin. In an effort to delineate other structure-activity relationships from these methane abatement experiments, the structures of purified CTs from these legumes were assessed with a combination of methanolysis, quantitative thiolysis, ¹H-13C HSQC NMR spectroscopy and ultrahigh-resolution MALDI-TOF MS. The composition of these CTs is very diverse: procyanidin/prodelphinidin (PC/PD) ratios ranged from 98/2 to 2/98; cis/trans ratios ranged from 98/2 to 34/66; mean degrees of polymerization ranged from 6 to 39; and % galloylation ranged from 0 to 75%. No strong correlation was observed between methane production and the protein precipitation capabilities of the CT towards three different proteins (BSA, lysozyme, and alfalfa leaf protein) at ruminal pH. However, a strong non-linear correlation was observed for the inhibition of methane production versus the anti...Continue Reading

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Citations

Oct 28, 2019·Animals : an Open Access Journal From MDPI·Isaac A Aboagye, Karen A Beauchemin
Jan 28, 2020·Journal of Agricultural and Food Chemistry·Wayne E ZellerKevin Panke-Buisse
Mar 23, 2021·Frontiers in Veterinary Science·Luis O TedeschiSusanne U Mertens-Talcott
Apr 24, 2019·Journal of Agricultural and Food Chemistry·Guillaume BillerachHélène Fulcrand

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Methods Mentioned

BETA
NMR
Protein Assay

Software Mentioned

TopSpin
hsqcetgpsisp
GraphPad
Prism

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