Abstract
The ability of synthetic Boehmite to remove and adsorb phosphate ions from two kinds of soy sauce was investigated. Boehmite was added to soy sauce samples and the concentration of phosphate ions and other substances in the filtrates was measured after filtration. The Boehmite adsorbed phosphate ions efficiently, this ability increased with the volume of Boehmite and treatment time. The aluminum ions and sulfate ions in both soy sauce samples increased slightly after this treatment but the total nitrogen and sodium chloride did not change. The fact that little aluminum dissolved in the soy sauce during the Boehmite treatment may be because soy sauce was only slightly acidic. In addition, the mechanism of Boehmite on the removal of phosphate ions from soy sauce involves not only physical adsorption but also the ion exchange effects of the Boehmite. Because a small amount of sulfate impurity in the Boehmite was exchanged by phosphate ions and dissolved in the soy sauce. These results indicate that synthetic Boehmite is a useful substance for removing phosphate ions from soy sauce with few effects on other ingredients and inorganic ions.
