The Comparative Study of Antioxidant Activity of Pigment from Jujube Juice Pomace and Wine Pomace

To explore the difference of antioxidant activity of pigment from jujube juice pomace and wine pomace,the pomace of jujube juice and wine were used as raw materials and alkaline method was used to extract jujube pigments. The contents of active components in the pigment from jujube juice pomace and wine pomace were determined by colorimetric method,the scavenging ability of DPPH·,ABTS⁺·,·OH,O₂^-· and reducing power of pigment were detected,the antioxidant activities of pigment were compared,and the correlative relationships between the contents of active components and antioxidant activity of pigment were analyzed by SPSS statistical analysis software. The results showed that there were significant differences in the antioxidation active components contents of pigment between jujube juice pomace and wine pomace(P<0.05),with the extension of fermentation time,the contents of antioxidant active components of pigment decreased gradually. The pigments extracted from jujube juice pomace and wine pomace had better antioxidant activity,and had a significant difference on scavenging ability of DPPH·,ABTS⁺·,·OH,O₂^-· and reducing power(P<0.05),with the extension of fermentation time,the antioxidant activity of pigment decreased gradually. The results of correlation study showed that antioxidation active components contents were highly correlated with antioxidant activity of pigment from jujube juice pomace,while the content of total flavones of pigment from wine pomace was weak correlated with antioxidant activity. It was indicated that the antioxidant activity of pigment from jujube juice pomace was significantly higher than that in wine pomace(P<0.05).