The Australian Wine Research Institute , P.O. Box 197, Glen Osmond, Adelaide 5064, Australia.
Department of Economic Development, Jobs, Transport, and Resources , 1301 Hazeldean Road, Ellinbank, Victoria 3821, Australia.
J Agric Food Chem. 2016 Sep 28;64(38):7076-86. doi: 10.1021/acs.jafc.6b03126. Epub 2016 Sep 20.
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), and ethanol soluble carbohydrates (2.0-40.6% DM). Fatty acid concentrations varied throughout the 20 samples (5.2-184.5 g/kg DM), although fatty acid profile showed two distinct groups. Grape marc varies widely in nutritional value, and in compounds that have been linked with changes in ruminant digestion and methane emissions.
葡萄渣含有多种具有抗甲烷生成潜力的化合物，包括缩合单宁（CTs）。使用直接间苯三酚法，对 66 个葡萄渣样品中的 CT 化学物质进行了调查，结果表明其浓度存在差异（干物质的 6.9 至 138.8 克/千克）。尽管所有组成变量均呈显著相关（P<0.0001），但发现浓度与 CT 组成无关。从聚类分析中选择了 20 个 CT 组成多样的样品，并分析了与反刍动物消化和甲烷生成相关的化合物，包括可代谢能（6.6-12.0 兆焦耳/千克 DM）、粗蛋白（3.2-14.4% DM）、中性洗涤剂纤维（18.4-61.4% DM）和乙醇可溶性碳水化合物（2.0-40.6% DM）。尽管脂肪酸谱显示出两个不同的组，但这 20 个样品中的脂肪酸浓度存在差异（5.2-184.5 克/千克 DM）。葡萄渣的营养价值差异很大，而且与反刍动物消化和甲烷排放变化有关的化合物也存在差异。
