%0 Journal Article %A Kristine M. Hagen %A Markus Keller %A Charles G. Edwards %T Survey of Biotin, Pantothenic Acid, and Assimilable Nitrogen in Winegrapes from the Pacific Northwest %D 2008 %R 10.5344/ajev.2008.59.4.432 %J American Journal of Enology and Viticulture %P 432-436 %V 59 %N 4 %X 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. %U https://www.ajevonline.org/content/ajev/59/4/432.full.pdf