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KMID : 1024420090130040262
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Food Engineering Progress
2009 Volume.13 No. 4 p.262 ~ p.268
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Solvent Leaching Characteristics of Dark Brownish Pigment from Activated Charcoal used in Decolorization of Crude Polysaccharide from Auricularia auricula
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Kim Hyeon-Min
Lee Shin-Young
Hur Won
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Abstract
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A dark brownish pigment in the crude polysaccharide from Auricularia auricula was adsorbed by activated charcoal. The leaching of the pigment adsorbed on activated charcoal and regeneration of activated charcoal used was investigated with eight kinds of solvents. The highest leaching capacity was obtained with the alkaline solution (KOH). The optimum volume of 1 M KOH solution per activated carbon was 45 mL/g, and the treatment for 10 min during single stage leaching was sufficient to achieve the leaching equilibrium. Second-order kinetic model provided the best fitting for the pigment leaching. The pigment leaching capacity of 88.9% was obtained by seven times of treatment with 1 M KOH solution at 25℃, while at 95℃, leaching capacity of 82.6% was achieved with single stage alone showing the significant increase of leaching capacity with increasing temperature. The regenerated activated charcoal was nearly as effective as fresh activated charcoal in pigment adsorption of crude polysaccharide from Auricularia auricula.
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KEYWORD
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Auricularia auricula, activated carbon, solvent Leaching, pigment, regeneration
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