TY - JOUR T1 - Effect of Wine Dilution on the Reliability of Tannin Analysis by Protein Precipitation JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 103 LP - 105 DO - 10.5344/ajev.2008.59.1.103 VL - 59 IS - 1 AU - Jacob Skibsted Jensen AU - Hans Henrik Malmborg Werge AU - Max Egebo AU - Anne S. Meyer Y1 - 2008/03/01 UR - http://www.ajevonline.org/content/59/1/103.abstract N2 - A reported analytical method for tannin quantification relies on selective precipitation of tannins with bovine serum albumin. The reliability of tannin analysis by protein precipitation on wines having variable tannin levels was evaluated by measuring the tannin concentration of various dilutions of five commercial red wines. Tannin concentrations of both very diluted and concentrated samples were systematically underestimated, which could be explained by a precipitation threshold and insufficient protein for precipitation, respectively. Based on these findings, we have defined a valid range of the tannin response in the protein precipitation-tannin assay, which suffers minimally from these problems. ER -