Characteristics of minerals extracted from the mid-gut gland of Japanese scallop Patinopecten yessoensis at various pH values

Fisheries Science - Tập 78 - Trang 675-682 - 2012
Joko Santoso1, Yuka Ishizuka2, Yumiko Yoshie-Stark3
1Department of Aquatic Products Technology, Faculty of Fisheries and Marine Science, Bogor Agricultural University, Bogor, Indonesia
2Department of Food Science and Technology, Faculty of Marine Science, Tokyo University of Marine Science and Technology, Tokyo, Japan
3Department of Food Life Science, Faculty of Life Science, Toyo University, Gunma, Japan

Tóm tắt

This experiment was carried out to determine the proximate composition of the mid-gut gland (MGG) of the Japanese scallop Patinopecten yessoensis to evaluate the characteristics of divalent minerals and water-soluble protein at various pHs, and to examine Cd-binding protein at different molecular weights. MGG of scallop contained protein, fat and ash of 28.9 g/100 g dry matter, 44.6 g/100 g dry matter and 6.78 g/100 dry matter, respectively. MGG also contained the macrominerals sodium, potassium, magnesium and calcium, and the trace minerals iron, zinc, cadmium and copper. The solubility of divalent minerals and water-soluble protein was high in both acidic and alkaline conditions, except that magnesium was not affected by acidity. The solubility of copper and iron had a positive correlation with water-soluble protein at all pH values, whereas cadmium had a strong correlation at alkaline pH. Low-molecular-weight water-soluble protein (fraction III, 437.5 < MW < 1,355) bound cadmium strongly in acidic, neutral and alkaline conditions. However, in acidic conditions cadmium had the strongest binding to protein.

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