The aim of this work was to determine some fruit quality parameters of grapefruit "Citrus Paradisi Macf" including, weight, diameter, peel, seed number, juice content, titratable acidity, soluble solids, maturity index, as well as its antioxidant content. Fruits ’’Mac carty’’, ’’Natsu mikan’’, ’’Triumphe’’, ’’Marsh’’, ’’Thompson”, ’’Java’’, ’’Ruby’’ and ’’Foster’’ Collection of citrus INRA Morocco were used. In this study, we have only found that the three varieties: ’’Marsh’’, ’’Triumphe’’ and ’’Java’’ have respectively significant juice content (40.13 ± 0.090%, 39.36% and 38.57 ± 0.010 ± 0.020%) and sugar (9.47% ± 0.057, 8.70 ± 0.010% and 7, 20 ± 0.10%) but a relatively low acidity (1.56 ± 0.010%, 1.45% and 1.15 ± 0.000 ± 0.010% ). In addition, ’’Marsh’’ had a rich in caroténoïds (0.0967 ± 0.07506 mg / L) compared to ’’Triumph’’e and ’’Java’’. Moreover, in the variety ’’Natsu mikan’’ and ’’Foster’’ the concentration of ascorbic acid was much higher (592.2 mg / L and 516,53mg / L), but the caroténoïds content and sugar was low. On the other hand, the ’’Mac Carty’’ proved very rich in caroténoïds (0.1800 ± 0.01000 mg / L), acidity (1.85 ± 0.040%) and sugar (10.33 ± 0.058%). According to our results, Grapefruit ’’Marsh’’, ’’Natsu mikan’’, ’’Foster’’ and ’’Mac carty’’ have proved to be good sources of natural antioxidants among the varieties studied.
