Restoration of the red colour of photo-bleached carthamine in calcium-alginate gel membranes |
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Authors: | Koshi Saito Toshiyuki Mori |
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Affiliation: | Department of Bioscience and Technology, School of Engineering, Hokkaido Tokai University, Sapporo 005, Japan |
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Abstract: | The restoration of the red colour of carthamine (photo-bleached in polymeric heterosaccharide gels) was investigated using sodium salts, potassium salts, and alkali. Ca-alginate gel was stained with carthamine, and the red-dish membranes were exposed to fluorescent light for 2·5, 4·0 and 20 h (at 28°C). The resulting orange-yellow gel membranes were treated with Na- or K-citrate solution and the restoration of the red colouration was followed spectrophoto-metrically. The results indicate that the red colour of carthamine can be retained within the gel membranes, while yellow-coloured compounds were removed and/or transformed by the alkaline salt solutions. |
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Keywords: | Carthamine red colour restoration light-bleaching Ca-alginate gel |
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