A Modification of the Method of Manufacturing Crude Hesperidin from Satsuma Mandarin (Citrus unshiu Marc.) Peel Residue

Abstract

In order to utilize Satsuma mandarin peel residue effectively, which contains many useful compounds, the method of extraction and recovery of hesperidin from dried Satsuma mandarin peel residue was studied. The results obtained were as follows; (1) The hesperidin content in a extracted solution was the highest, when the residue was extracted for 30 min with stirring at 20-40°C. (2) The optimum pH for crystallization of hesperidin from the extracted solution was around 5.0. And the recovery became much higher by heating the solution adjusted to pH 5.0 in the range of 70-90°C. (3) Therecovery yields were remarkably influenced by the quantity of added water to the residue. The best result was obtained by adding 800ml of water to 100g of the sample. In this condition, the recovery and purity of hesperidin was 27.3% and 93.7%, respectively. (4) To recover hesperidin effectively, it is necessary to adjust the hesperidin content in the extracted solution to approximately 500mg/100ml. Also, a higher yield (53.0%) was obtained by recycling the secondary extracted solution after concentration.