Abstract
Abstract A series of grape juices and concentrates were diluted with Macllvaine’s buffer at pH levels ranging from 2 to 8 and analyzed spectrophotometrically. The relationship of various Concord and California grape juice samples from different geographical areas were characterized individually and in combination. The spectral characteristics of Concord and Salvador grape juice were found to be similar except at pH 7, where the Concord curve has two peaks (583 and 450 mμ) and the Salvador curve has only one. The anthocyanin components in Concord grape juice were studied chromatographically for an explanation of its unique spectral response at pH 7. Results are incomplete, and further study is recommended.
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