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Metabolite profiling of grape: Flavonols and anthocyanins. | LitMetric

Metabolite profiling of grape: Flavonols and anthocyanins.

J Agric Food Chem

IASMA Research Centre, Via E. Mach 1, 38010 San Michele all'Adige, Italy.

Published: October 2006

AI Article Synopsis

  • * The study identified laricitrin 3-O-galactoside and syringetin 3-O-galactoside in red grapes for the first time, with quercetin being the dominant flavonol in both red (43.99%) and white (81.35%) grape varieties.
  • * White grapes lack certain flavonols like myricetin and laricitrin, indicating the absence of the enzyme flavonoid 3',5'-hydroxyl

Article Abstract

Flavonols are products of the flavonoid biosynthetic pathway, which also give rise to anthocyanins and condensed tannins in grapes. We investigated their presence in the berry skins of 91 grape varieties (Vitis vinifera L.), in order to produce a classification based on the flavonol profile. The presence of laricitrin 3-O-galactoside and syringetin 3-O-galactoside in red grapes is reported here for the first time. In red grapes, the main flavonol was quercetin (mean = 43.99%), followed by myricetin (36.81%), kaempferol (6.43%), laricitrin (5.65%), isorhamnetin (3.89%), and syringetin (3.22%). In white grapes, the main flavonol was quercetin (mean = 81.35%), followed by kaempferol (16.91%) and isorhamnetin (1.74%). The delphinidin-like flavonols myricetin, laricitrin, and syringetin were missing in all white varieties, indicating that the enzyme flavonoid 3',5'-hydroxylase is not expressed in white grape varieties. The pattern of expression of flavonols and anthocyanins in red grapes was compared, in order to gain information on the substrate specificity of enzymes involved in flavonoid biosynthesis.

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Source
http://dx.doi.org/10.1021/jf061538cDOI Listing

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