Isolation of hesperidin from peels of thinned Citrus unshiu fruits by microwave-assisted extraction
2010
Inoue, Tsuyoshi | Tsubaki, Shuntaro | Ogawa, Kazunori | Onishi, Kiyotaka | Azuma, Jun-ichi
Simultaneous extraction by microwave-irradiation and crystallisation were performed in the same pot of solvent of 70% (v/v) aqueous ethanol for isolation of hesperidin from thinned immature fruit peels of Citrus unshiu as refining of Citrus waste biomass. The hesperidin content in immature fruits peels was about 3.2-fold higher than that of mature fruit. After microwave-assisted extraction (MAE), the yield of hesperidin reached 58.6mg/g, which was comparable to the amount obtained after extraction using DMSO:methanol (1:1, v/v) as a solvent for 30min at room temperature. Heating temperature and time for isolation of hesperidin crystallites were optimised as 140°C and 8min by using response surface methodology. Under this optimal condition, 86.8% (47.7mg/g) of total hesperidin was isolable by MAE and low-temperature storage (5°C, 24h).
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