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The Physicochemical properties of six varieties of domestic orange and orange juices which were grown and produced in Korea, were analyzed their qualities, including taste evaluation based on the amount and the ratio of sugar and acid. The physicochemical properties of mandarin we as follows soluble solid 1011° Bx, total acidity 0.76∼1.20% ratio of sugar and acid 7.9∼13.8Sugars of orange are mainly composed of sucrose, glucose, fructose. The sucrose content of mandarin way a little higher than that of sweet orange. The organic acids in orange mere mainly citrate and malate. The content of these two acid in orange, were 0.8-1.4%. Mandarin type oranges tastes more sour than sweet orange. Hesperdin existed 30.8-67.5㎎% in oranges. Naringin, one of the bitter components, was not detected in both varieties. The optimum sweetness and acid content were determined based on the results of sensory evaluation.
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