TY - JOUR T1 - Compositional Variability in Commercial Tannin and Mannoprotein Products JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. DO - 10.5344/ajev.2017.17057 SP - ajev.2017.17057 AU - Sijing Li AU - Kerry L. Wilkinson AU - Keren A. Bindon Y1 - 2017/12/15 UR - http://www.ajevonline.org/content/early/2017/12/13/ajev.2017.17057.abstract N2 - Enotannin and mannoprotein additives are applied in order to achieve protein, cold or color stability in wine, or alternatively to modify wine sensory properties. In most cases, only basic compositional information and a proposed effect in wine are provided by the manufacturer. In this study, 14 grape-based enotannins and 8 mannoproteins were sourced from the Australian market and their composition and molecular size distribution were determined. Diverse product composition was observed for both categories, suggesting a range of effects could potentially be achieved by applying different products. Moreover, some products showed good agreement between product composition and their designated material of origin, while others showed significant differences. ER -