contents of physiologically dropped un-matured citrus fruits pre- pared by different drying methods are given in Table 1 and Fig. 1. In most cases, the single and total flavonoids content after 60 C hot- air drying were not significantly different from those obtained after freeze-drying and the single and total flavonoids contents after sun-drying had a slightly reduction compared to those obtained from freeze drying, suggesting that mild hot-air drying is a good way to retain flavonoids in the dried material.