Relation of Quality Indices of Individual Blueberries to Photoelectric Measurement of Anthocyanin Content1

Abstract

Individual fruit pH, total acidity (AC as %), soluble solids (SS as %), and SS/AC ratios correlated significantly with anthocyanin contents of ‘Wolcott’, ‘Morrow’, ‘Jersey’, and ‘Tifblue’ blueberries as measured by light transmission (ΔOD740-800 nm). Fruit orientation with respect to the light path influenced readings. The relationships of the light transmission values to the quality indices differed among cultivars.