RT Journal Article SR Electronic T1 Bitterness and Astringency of Grape Seed Phenolics in a Model Wine Solution JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 150 OP 152 DO 10.5344/ajev.1978.29.3.150 VO 29 IS 3 A1 R. A. Arnold A1 A. C. Noble YR 1978 UL http://www.ajevonline.org/content/29/3/150.abstract AB Bitterness and astringency of three concentrations of grape seed phenolic extract were evaluated in a model system using standard sensory testing procedures. For phenolic concentrations of 25, 80 and 135 mg/l (gallic acid equivalent), the ratings for astringency, respectively 2.14, 2.91 and 3.62, increased with phenolic concentration increase (p < 0.01). The bitterness ratings for the three phenolic concentrations, respectively 4.36, 5.16, and 4.99, however, were not significantly different from each other.