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Ascorbic acid and mineral composition of longan (Dimocarpus longan), lychee (Litchi chinensis) and rambutan (Nephelium lappaceum) cultivars grown in Hawaii
- Wall, M.M.
- Subtropical plant science 2006 v.19 no.6-7 pp. 655
- Dimocarpus longan, Litchi chinensis, Nephelium lappaceum, cultivars, fruits (food), provenance, fruit composition, vitamin content, ascorbic acid, mineral content, soluble solids, Dietary Reference Intakes
- Longan (Dimocarpus longan), lychee (Litchi chinensis), and rambutan (Nephelium lappaceum) cultivars were harvested from different locations in Hawaii and analyzed for vitamin C (ascorbic acid) and mineral content. Longan fruit had the highest vitamin C content (60.1 mg/100 g fresh weight) among the three specialty fruits tested. Average ascorbic acid content was 27.6 mg/100 g for lychees and 36.4 mg/100 g for rambutans. Vitamin C content was 63.3 and 55.3 mg/100 g for the longan cultivars, Biew Kiew and Sri Chompoo, respectively. For rambutans, vitamin C content ranged from 22.047.8 mg/100 g for the six cultivars tested. The early maturing lychee cultivar, Kaimana, had an average ascorbic acid content of 33.2 mg/100 g, and the later maturing Groff and Bosworth-3 cultivars had 21.2 and 22.5 mg/100 g, respectively. No correlation was found between ascorbic acid and total soluble solids (TSS) content. Longans were a good source of K (324.9 mg/100 g) and Cu (0.26 mg/100 g). Consumption of lychee fruit (100 g) would meet 2-4% of the daily recommended intake (DRI) for six minerals (P, K, Mg, Fe, Zn, Mn), and 22% of the DRI for Cu. Rambutan fruit had 20% of the DRI for Cu and 8-10% of the DRI for Mn. In general, fruit mineral content was not associated with soil mineral content.