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Influence of Stems, Petioles and Leaves on the Phenolic Content of Concord and Aurora Blanc Juice and Wine
Author(s) -
HUANG PAOJUI DAVID,
CASH JERRY N.,
SANTERRE CHARLES R.
Publication year - 1988
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1988.tb10202.x
Subject(s) - tannin , wine , flavonoid , chemistry , food science , horticulture , botany , biology , antioxidant , biochemistry
Stems, petioles and leaves have historically caused operational problems at the processing plant and may alter juice and wine quality. Concord and Aurora Blanc grape samples, taken from the mechanical harvesters, were analyzed for total weight of material other than grape (MOG) and percent MOG. Hand‐picked samples, with and without added stems, leaves, and petioles, were compared for phenolic content. Chemical analysis included total and phenolic fractions. Stems, petioles and leaves (i.e. MOG) have a definite affect on the chemical constituents. The total phenolic, flavonoid, and tannin contents of wine and juice increased as MOG content in the harvested grapes increased.