Antioxidant Activity Of Maillad Reaction Products From Twin-Screw Extruded Ginseng Products

The twin-screw extruded technology was applied to the processing of ginseng products in this study, the physical and chemical indicators of reducing sugar and amino nitrogen’s content, antioxidant activity, browning degree and color were investigated from white ginseng, red ginseng and the twin-screw extruded ginseng products at different extrusion conditions, open up a new way for the development and utilization of the twin-screw extruded ginseng products, expect to make contribution for the development of ginseng industry and regional economy in Jilin and the health of the people. The results showed that:1.In twin-screw extruded ginseng products, at the same water content in raw, the contents of reducing sugar and amino nitrogen decreased with increasing the barrel temperature; at the same barrel temperature, the contents of reducing sugar and amino nitrogen increased with increaseing the water content in raw. The order of reducing sugar and amino nitrogen in the samples was white ginseng> traditional red ginseng> the twin-screw extruded ginseng products.2.In twin-screw extruded ginseng products, at the same water content in raw, the browning degree and color increased with increasing the barrel temperature; at the same barrel temperature, the browning degree and color decreased with increasing the water content in raw. The order of browning degree and color in the samples was twin-screw extruded ginseng products> traditional red ginseng> white ginseng. Correlation analysis results show that: the browning degree and color showed a good positive correlation at the level of0.01(R=0.901).3. In twin-screw extruded ginseng products, at the same water content in raw, the reducing power and free radical scavenging capacity increased with increasing the barrel temperature; at the same barrel temperature, the reducing power and free radical scavenging capacity decreased with increasing the water content in raw. The order of reducing power and free radical scavenging capacity in the samples was twin-screw extruded ginseng products> traditional red ginseng> white ginseng, and the hydroxyl radical scavenging capacity is close to100%. The correlation analysis showed that:the reducing power with DPPH radical scavenging capacity and hydroxyl radical scavenging capacity showed a good positive correlation at the level of0.01(R=0.996-0.998).4. The liquid reducing power and free radical scavenging capacity in the twin-screw extruded ginseng products which the water water content in raw was20%, the barrel temperature was140℃was significantly higher than that of outer fluid, but less than the sample which was not dialysis.5.The content AFG in liquid was determined by HPLC, founded that the content in traditional red ginseng and20%/140℃twin-screw extruded ginseng were1.95%and7.79%, the twin screw extrusion technology improved the content of AFG in ginseng products.