Photo-stability of Mixture of Violet Pigments Phycoerythrin and Phycocyanin Extracted without Separation from Discolored Nori Seaweed
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概要
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Water-soluble pigment mixture was extracted from discolored nori seaweed without separating phycoerythrin (PE) and phycocyanin (PC). The stability of this mixture against light irradiation was studied for application as a violet food coloring additive. The PC component showed greater photo-stability than the PE component of the pigment solution (pH 7.0, 20°C) under irradiation at 5,300 and 7,800 Lx. The ratio of the second-order rate constant kPE/kPC which reflects photo-destruction was 9.3 (5,300 Lx) and 7.0 (7,800 Lx). The results were similar to those of a respective pigment separated by gel-chromatography. As for tonal changes, the a* value was decreased and both the b* and L* values were increased with progressing photo-destruction, namely, the violet color changed to pale dark-violet due to de-coloration of the red PE component. A reduction in photo-fading of 6.6% (PE) and 6.9% (PC) was achieved by 7,800 Lx irradiation for 5 h, compared with the control, by adding γ-cyclodextrin to the mixture.
- 2010-11-01
著者
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SUMI Toshihisa
Department of Applied Biological Sciences, Faculty of Agriculture, Saga University
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Yumihara Kazuyo
Department Of Biological And Chemical Systems Engineering Kumamoto National College Of Technology
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Sumi Toshihisa
Department Of Biological And Chemical Systems Engineering Kumamoto National College Of Technology
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Hamabe Yuko
Department Of Biological And Chemical Systems Engineering Kumamoto National College Of Technology
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Hamabe Yuko
Department Of Bioengineering Yatsushiro National College Of Technology
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Kohata Susumu
Department Of Biological And Chemical Systems Engineering Kumamoto National College Of Technology
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Kohata Susumu
Department Of Bioengineering Yatsushiro National College Of Technology
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MATSUNAGA Noboru
Advanced Course of Bioengineering, Yatsushiro National College of Technology
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Matsunaga Noboru
Advanced Course Of Bioengineering Yatsushiro National College Of Technology
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