Proximate composition of agro-industrial wastes of sugar cane farm, sugar
cane 'bagasse, sugar beet farm, sugar beet pulp, stevia, Jerusalem artichoke, chicory
farm and chicory pulp were determined. Polyphenolic phytochemical content of these
waste materials were extracted with hoi aqueous methanol. Total phenoliCS content in
the methanolic extract were determined, Phenolic compounds in each extract were
identified with HPLC. Antioxidant activity of each methanolic extract was evaluated.
The obtained results revealed that total phenolic contents of various waste materials
were in range of 1.68 to 16.13 g/100 g of dry matter expressed as gallic acid
equivalents and the highest amount was obtained in stevla wastes followed with . sugar cane farm.. Identification analysis with HPLC revealed that there are at least
seven 'of different phenolic compounds with different concentration in each methanolic
extract except Jerusalem artichoke and chicory pulp which contained only one
identified compound. Moreover the results of antioxJdative activities of the obtained
melhanolic extracts showed that all of rnethanolic extracts had inhibited hydroperoxide
formation in sunflower oil during storage at 60·C. The sugar cane and stevia extract
had the highest inhibition effect on the hydroperoxide formation. Application such.
material as antioxidant may provide health promoting advantages to consumer as a
natural antioxidant and maximize the utilization of such crops.