PIGMENTATION AND COLOR COMPARISON OF RUBY RED AND STAR RUBY GRAPEFRUIT JUICE

Juice of the Star Ruby grapefruit (Citrus paradisi Macfad) extracted by commercial machinery and canned during the regular harvest season contained from 0.34 to 0.56 mg/100 g of 3-carotene and 0.57 to 0.72 mg/100 g of lycopene, as compared to the corresponding respective value ranges of 0.09-0.14 mg/100 g of 3-carotene and 0.04-0.08 mg/100 g of lycopene for the Texas Ruby Red variety. Blending with Star Ruby juice at about a 30% level in the early processing season and 40% in the late processing season is proposed as a means of maintaining a desired level of pink color in canned Texas grapefruit juice. In Texas, the processing of pink grapefruit juice is emphasized as contrasted to white grapefruit juice in Florida and California. © 1979, American Chemical Society. All rights reserved.