Carotenoid levels in papaya and peach determined by high performance liquid chromatography

Carotenoids are natural pigments responsible for the color of many foods such as fruit, vegetables, egg yolk, skin and the flesh of some fish. However, its importance is also related to biological functions or actions in humans, such as the provitamin A activity, enhancement of the immune system, reduction of the risk of degenerative diseases, such as cancer, cardiovascular diseases, macular degeneration and cataract. The determination of the carotenoid composition of foods is therefore considered a priority worldwide. The objective of the present study was to analyze quantitatively, by high performance liquid chromatography, the principal carotenoids of three cultivars of papaya (Formosa, Golden and Sunrise) and three cultivars of peach (Xiripa, Coral and Diamante). For each cultivar, five sample lots were analyzed, collected during the year for papaya and during the season for peach. The three papaya cultivars had a similar composition, the mean total contents of lycopene, beta-cryptoxanthin and beta-carotene varied from 18.5 to 23.9, 8.2 to 11.7 and 0.5 to 1.2 mu g.g(-1), respectively. In relation to peach, the cultivars Coral and Xiripa had very low levels of carotenoids. The cultivar Diamante had a mean total content of 6.4 mu g.g(-1) of P-cryptoxanthin, the major carotenoid.271131