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Physicochemical properties and chemical compositions of Citrus fruits produced in Cheju were investigated. Soluble solids, total sugar and acid content of Citrus unshiu were 10.4∼11.0°, 8.24∼8.79% and 1.04∼1.20%, respectively. Vitamin C ranging from 41.19∼46.55 ㎎/100 g was higher on medium type than on early type of Citrus unshiu. In case of inorganic elements in Citrus unshiu, potassium content was the highest, in the range of 108.66～132.65 ㎎/100 g, and it was higher on C. platymamma than on Citrus unshiu. however, the kinds and contents of carbohydrate in citrus juice were somewhat different among citrus varieties. Sucrose was 46.8∼64.6% and others were glucose and fructose, 18.4∼26.9% and 15.2∼30.2%, respectively. Citric acid content was 75.7∼96.2%, and others were malic acid, oxalic acid, and fumaric acid in the decreasing order.
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