Pigmentation and color comparison of Ruby Red and Star Ruby grapefruit juice

Abstract

Communicationsof the original juice concentrate should be such that it provides at least 46 mg/100 mL in the dilution at the time of preparation. If this criterion is met, the expected shelf-life to an expiration date value of 28 mg/100 mL is about 20 days.

Thermal Pasteurization Effects on Color of Red Grapefruit Juices

“…In the fresh Star Ruby juices, total pigment was three to 14 times greater, ranging from 10.8 to 22.8 ppm. As previously reported (Cruse et al,1979), variation in amounts of carotenoids, especially red lycopene in Star Ruby juices, was observed as Fig. 1-Changes in CIE a* and b* values after thermal pasteurization.…”

“…The pink to red color in red grapefruit is primarily associated with lycopene (Ting and Deszyck, 1958). Most published studies on color of red grapefruit considered pigmentation changes with maturity (Lime et al,1954), cultivar (Cruse et al, 1979), quantitative differences (Rouseff et al,1992), and seasonal changes (Ting et al, 1980), as well as factors affecting pigmentation and color in processed products (Lee, 1997).…”

Rapid Extraction of Lycopene and β‐Carotene from Reconstituted Tomato Paste and Pink Grapefruit Homogenates

“…LYCOPENE is the principal pigment in red tomatoes. It is also responsible for the red color in pink, ruby, star, ray and flame grapefruit (Matlack, 1935;Lime et al, 1957;Cruse et al, 1979). Consumer demand for red grapefruit and the widespread use of tomato paste as a colorant makes lycopene a commercially important natural pigment.…”

Determination of .beta.-carotene and other hydrocarbon carotenoids in red grapefruit cultivars

“…Ting and Deszyck (1958) reported that in Florida the lycopene concentration and visual color of Ruby Red grapefruit decreased rapidly with maturity but 3-carotene concentration increased with maturity. Cruse et al (1979) reported on the seasonal changes of lycopene and 3-carotene in Ruby Red and Star Ruby grapefruit juices from Texas. Gross (1987) examined the carotenoids in Ruby Red grapefruit grown in Israel.…”