Abstract
BACKGROUND: New pomelo and mandarin scion varieties growing under subtropical arid conditions were investigated for total antioxidants in the juice. Four different rootstocksโsour orange (Citrus aurantium (L.); SO), Volkamer lemon (C. volkameriana (Ten & Pasq.)), SB812 (C. sunki (Hort. ex Tan.) ร Poncirus trifoliate (L.)) and C. macrophylla (Wester)โwere tested.
RESULTS: Fruit juice was tested for total antioxidants, ascorbic acid and total polyphenol contents. Cyclic voltammetry (CV) analysis revealed three different antioxidant groups for pomelo and four groups for mandarin. CV analysis for the pomelo scion/rootstock combinations showed that ascorbic acid concentration was highest for scions grafted onto SO. Total polyphenol levels were similar among the pomelo varieties. Mandarin analysis revealed that โMeravโ scion/SO had the highest ascorbic acid concentration (1.91 ยฑ 0.01 mmol L^โ1^). Total polyphenol analysis discovered that โMeravโ 4/119โ/SB812 gave the highest levels, while โOra Shaniโ scion grafted on to any tested rootstock contained the lowest
CONCLUSION: We suggest that the SO rootstock is superior to Volka, 812 and macrophylla in terms of juice antioxidant capacity. For the pomelo, both โFlamingoโ scions were found to have high antioxidant production capacity, with โFlamingoโ 3/73 being slightly superior regardless of the rootstock. The best mandarins were โMeravโ hybrids in combination with SO rootstock. Copyright ยฉ 2009 Society of Chemical Industry