Abstract
The extraction, purification, preliminary characterization and antioxidant activity of glycoproteins from Sepia pharaonis muscle (SPMG) were investigated. The optimal extraction conditions were obtained using a Box-Behnken design. The crude SPMG was purified by DEAE-Cellulose 52 ion-exchange and Sephadex G-100 gel chromatography and two fractions (SPMG-I and SPMG-II) were obtained. SPMG-I and SPMG-II were rich in Glu, Asp, Leu, Arg and Lys with the molecular weight of 42.5 and 36.3 kDa, respectively. The glucose was the predominant monosaccharide composition of SPMG-I and SPMG-II. The existence of O-glycosidic linkage in SPMG-I and SPMG-II was demonstrated by a β-elimination reaction. SPMG-I and SPMG-II were characterized by FT-IR. SPMG, SPMG-I and SPMG-II showed excellent antioxidant activities and SPMG-I exhibited the highest antioxidant ability. These may provide theoretical basis for further system research and rational development and utilization of SPMG resource.
