• » Scientific abstract
  • » Free amino acid profiles from 'Pinot noir' grapes are influenced by vine N-status and sample preparation method
  • Top scientific programme at the MACROWINE 2021 congress
    Virtual Conference - from 23 to 30 June 2021
    It is considered to be the most important scientific congress for the wine sector, due to the breadth of topics covered - from vine to glass - and due to the number and origin of the researchers wh...
    Published on: 06/01/2021

Free amino acid profiles from 'Pinot noir' grapes are influenced by vine N-status and sample preparation method

Lee, J; Schreiner, RP. 2010.. FOOD CHEMISTRY 119 (2): 484-489

This study examined the impact of extraction method on ammonia, free amino acids, and yeast assimilable nitrogen (YAN) concentrations in 'Pinot noir' berries obtained from a vine nutrition Study (altered supply of N, P, or K). Berries were either juiced or exhaustively extracted as whole berries prior to analysis. Extracts, compared to juice samples, had a significantly higher level of ammonia-N, assimilable amino acid-N, and YAN. For example, juice YAN values were approximately 50% of extract YAN values, when both were expressed in the same units. Free amino acid profiles and relative concentrations of individual amino acids were different in juice versus extracts, depending on how well the skin fraction was extracted prior to analysis. Lowering N Supply reduced free amino acids, with arginine being reduced more than the other 20 free amino acids identified in 'Pinot noir' berries. This was true in both juice and extracts. Since berry skin contributed to actual YAN, wineries that determine YAN from mainly the Pulp fraction (juice) May underestimate YAN and as a result add more (artificial) N supplement than is required for the healthy fermentation of red winemaking (whole berry fermentations). Extraction procedure should be taken into consideration when comparing grape YAN. (We recommend that you consult the full text of this article).
Published on 07/12/2010
Related sheets
© All Right Reserved
ISSN 1826-1590 VAT: IT01286830334
powered by Infonet Srl Piacenza
Privacy Policy
This website and its related third-party services make use of cookies necessary for the purposes described in the cookie policy. If you want to learn more about cookies or how to disable them (either totally or partially), please see the cookie policy. By closing this banner, scrolling through this page, clicking on a link or continuing navigation in any other way, you consent to the use of cookies.
More informationOK

- A +
ExecTime : 1,530273