This experiment was carried out to study the mineral contents and profiles of several Indonesian green, brown, and red seaweeds, and to evaluate the solubilities of Ca and Mg as a#ected by boiling in di#erent solutions (water, +ῌ sodium chloride and *./ῌ acetic acid). The macromineral profiles were dominated by Ca, K, Na and Mg. The trace minerals Cu, Fe and Zn were found at low concentrations. Boiling in water and *./ῌ acetic acid significantly increased the solubilities of Ca and Mg (pῌ*.*/), whereas boiling in +ῌ sodium chloride resulted in varying solubilities of Ca and Mg. Mainly soluble Ca was found in both low (MWῌ+*,***) and high (MW῍,**,***) molecular weight fractions, whereas soluble Mg was found in the high (MW῍,**,***) molecular weight fraction.
Edible seaweeds were collected from Indonesia, a tropical country that does not show seasonal variations in temperature, to evaluate their health-related activities. Ethanol and acetone extracts were prepared from -green and -brown algae. The ethanol and acetone extracts from Padina australis showed the strongest DPPH radical scavenging activity. These extracts also had the highest concentrations of total phenol and flavonoid. Both the ethanol and acetone extracts of the 0 Indonesian seaweeds decreased Caco-, cell viability when such cells were treated with 0** mM hydrogen peroxide. However, when Caco-, cells were treated with 1** or 2** mM hydrogen peroxide, the ethanol and acetone extracts from P. australis increased cell viability significantly more than those from the other seaweeds. This study indicates that organic extracts of seaweed have useful health-related functions.
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