TY - JOUR T1 - Survey of Biotin, Pantothenic Acid, and Assimilable Nitrogen in Winegrapes from the Pacific Northwest JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 432 LP - 436 DO - 10.5344/ajev.2008.59.4.432 VL - 59 IS - 4 AU - Kristine M. Hagen AU - Markus Keller AU - Charles G. Edwards Y1 - 2008/12/01 UR - http://www.ajevonline.org/content/59/4/432.abstract N2 - Winegrape samples were collected from 2001 to 2003 in vineyards located in the Pacific Northwest. Riesling and Chardonnay had lower concentrations of biotin (often <1 μg/L) than did red cultivars. The concentration of pantothenic acid (mean 513 ± 181 mg/L) was lowest in Riesling but highest in Chardonnay. Most samples contained low amounts of yeast assimilable nitrogen (YAN), ranging from 25 to 336 mg/L (mean 124 ± 62 mg/L). While most grape samples had adequate amounts of pantothenic acid for fermentation, many were deficient in biotin or YAN. ER -