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KMID : 1024420150190030209
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Food Engineering Progress
2015 Volume.19 No. 3 p.209 ~ p.217
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Effect of Particle Size and High Pressure Processing on the Antioxidant Activity of the Skin and Flesh of Deodeok (Condonopsis lanceolata) )
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Hong Yoon-Ki
Ahn Ju-Hee
Yoon Won-Byong
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Abstract
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The effects of particle size and high pressure on the antioxidant activity of skin and flesh of deodeok (Condonopsis lanceolata) were studied. The deodeok powder was prepared by different particle sizes, such as 20-40 mesh, 40-60 mesh, and below 100 mesh. High pressure was applied at 250 MPa and 450 MPa for 10min. The antioxidant activity was measured by the concentration of total phenol, DPPH, and reduction power. According to the mass transfer theory, the diffusion rate was inversely proportional to the particle sizes of the solute. However, high extraction rate was observed from the large particle size (20-40 mesh) of the powder prepared by the whole deodeok which included both skin and flesh. When the powders were separately prepared by skin and flesh, the extraction rate were inversely proportional to the particle size. The antioxidant activity from the skin was significantly higher than that of flesh (p<0.05). High pressure treatment increased the antioxidant activity of flesh dramatically. The result of study indicated that the by-product of deodeok was a useful resource to obtain the antioxidants.
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KEYWORD
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condonopsis lanceolata skin , particle size , antioxidant , high pressure
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