Comparison of Green Technologies for Valorizing Sugar Beet Leaves (Beta vulgaris L.)

This study is focused on the valorization of sugar beet leaves (Beta vulgaris L.), a prominent by-product wasted during process sugar. For doing so, Ultrasound-Assisted Extraction (UAE), Pressurized Liquid (PLE), and Maceration (ME) methods were compared by evaluating extraction yield, Total Phenolic Compounds (TPC), Flavonoid Content (TFC), individual phenolic profile, antioxidant activity (e.g., DPPH, FRAP, ABTS). Ethanol water (70% V/V) employed as extracting solvents. The TPC for UAE PLE was 4.90±0.083 6.46±0.33 (mg GAE/mL), respectively, differing significantly (P<0.05) from each other. Moreover, TFC in method highest with 1.45±0.06 mg QE/mL (P<0.05). extracts different yielded quantities. Benzoic acid present only extracts, while ME recovered quantity syringic (0.35±0.00 mg/L) pyrogallol (74.80±0.01 mg/L), respectively. However, yield obtained (19.58±0.33%) had significant statistical difference other methods. Therefore, despite higher reached method, it proved that yields polyphenolic compounds lower leaves.