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Microstructure and Antioxidative Activity of Red, White and Extruded Ginseng

  • Ryu, Gi-Hyung (Department of Food Science and Technology, Kongju National University)
  • Published : 2006.03.01

Abstract

The objective of this study was to compare the color and microstructure of powder, redness, brownness, and antioxidative activity in extruded ginseng, white ginseng and red ginseng extracts. The colors of extruded dry ginseng powder (moisture content 30%, barrel temperature $110^{\circ}C$, and screw speed 200 rpm) were similar to those of red ginseng. Intact cell wall structure was examined in dried root ginseng at $70^{\circ}C$ (A), white ginseng with skin (D), white ginseng without skin (E), and red ginseng (F) under a scanning electron microscope. The cell wall was not detected in samples B and C (dry ginsengs extruded with 25% and 30% moisture contents, respectively). Intact starch granules were detected in samples A, D, and E under a scanning electron microscope. Melted starch granules were detected in samples B, C, and F. Colors (L, a, b) of 50% EtOH extracts were similar in samples C and F. Browniness and redness of extracts were high in extruded dry ginseng and red ginseng extracts. Extruded dry ginseng (B) showed higher electron donation ability and phenolic content than the other samples.

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  2. Effects of Extrusion Conditions on the Physicochemical Properties of Extruded Red Ginseng vol.17, pp.3, 2012, https://doi.org/10.3746/pnf.2012.17.3.203
  3. The effect of extrusion conditions on the acidic polysaccharide, ginsenoside contents and antioxidant properties of extruded Korean red ginseng vol.37, pp.2, 2013, https://doi.org/10.5142/jgr.2013.37.219