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PHENOLIC AND SUGAR COMPOSITIONS OF SOME Hieracium L. (ASTERACEAE) LEAVES IN NORTH EAST ANATOLIA

Summary: In this study, the contents of total phenolic substances, hexose and pentose, glucose and reducing sugar in leaves of four endemic species of Hieracium (H. hypopityforme, H. karogoellense, H. microtum and H. gentiliforme) were analysed. The highest content of total phenols was quantified in the leaves of H. karogoellense (31.78 mg/g DW) while the highest contents of pentoses, hexoses and glucose were found in the leaves of H. microtum. Reducing sugar levels in the leaves of H. hypopifyforme, and H. gentiliforme were richer than those of H. karogoellense and H. microtum. The results showed that leaves of the Hieracium species were very rich in phenolic substances and sugars.