Journal article
Survey of the Variation in Grape Marc Condensed Tannin Composition and Concentration and Analysis of Key Compositional Factors
JL Hixson, JL Jacobs, EN Wilkes, PA Smith
Journal of Agricultural and Food Chemistry | AMER CHEMICAL SOC | Published : 2016
Abstract
Grape marc contains a number of compounds with potential antimethanogenic activity in ruminants, including condensed tannins (CTs). Using direct phloroglucinolysis, a survey of CT chemistry across 66 grape marc samples showed diversity in concentration (6.9 to 138.8 g/kg of dry matter). Concentration was found to be independent of CT composition, although all compositional variables were significantly correlated (P < 0.0001). Twenty samples diverse in CT were selected from a cluster analysis and analyzed for compounds relevant to ruminant digestion and methanogenesis, including metabolizable energy (6.6-12.0 MJ/kg DM), crude protein (3.2-14.4% DM), neutral detergent fiber (18.4-61.4% DM), an..
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Funding Acknowledgements
This work is part of the National Livestock Methane Program (NLMP), supported by funding from the Australian Government Department of Agriculture, Fisheries, and Forestry as part of its Carbon Farming Futures, Filling the Research Gap Program, and managed by Meat & Livestock Australia. The Australian Wine Research Institute, a member of the Wine Innovation Cluster in Adelaide, is supported by Australian grape growers and winemakers through their investment body, Wine Australia, with matching funds from the Australian Government.