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Effect of Metal Ions on Stabilization of Codium fragile's Pigments  

Lee, In-Seon (Department of Food Engineering, Mokpo National University)
Lee, Hong-yeol (Department of Hotel Culinary and Bakery, Dong-A College)
Kim, Hag-Lyeol (Department of Food Engineering, Mokpo National University)
Ko, Kang-Hee (Department of Food Engineering, Mokpo National University)
Chang, Hae-Choon (Department of Food and Nutrition, Chosun University)
Kim, In-Cheol (Department of Food Engineering, Mokpo National University)
Publication Information
Food Science and Preservation / v.15, no.3, 2008 , pp. 352-360 More about this Journal
Abstract
The extraction yield and storage stability of Codium fragile pigments extracted in acetone, ethanol or methanol were studied. Methanol was the most effective solvent for pigment extraction, providing an extraction yield of $25.0{\pm}2.10\;mg/g$ (my base). As shown by TLC and HPLC analysis, chlorophyll a(0.40 mg/g) and chlorophyll b(1.94 mg/g) were the major pigment components in dried Codium fragile. The total chlorophyll content of Codium fragile stored a 40C in light or dark conditions for 30 weeks remained at 23.2% and 58.4% respectively. The effect of metal ions ($Cu^{++}$, $Zn^{++}$, $Fe^{++}$ and $Mg^{++}$) on pigment stability was analyzed Among the four metal ions $Cu^{++}$ was the most effective stabilizer of Codium fragile pigments during storage, and $Zn^{++}$ ion was the second most effective. In the presence of 1 mM $Cu^{++}$, the total chlorophyll retained in Codium fragile stored at 40C in light or dark conditions was increased to 47.0% and 88.8% after 30 weeks storage, respectively. The optimum concentrations of $Zn^{++}$ and $Cu^{++}$ for pigment stabilization under dark conditions were 0.5 mM and 0.1 mM, respectively.
Keywords
Codium fragile; storage stability; chlorophyll; pheophytin; metal ions;
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