Issue 5, 1999

New Ca-sequestering materials . based on the oxidation of the hydrolysis products of lactose

Abstract

The Ca-sequestering capacity of the equimolar mixture of aldonic acids or aldaric acids obtained by selective catalytic oxidation of the hydrolysis products of lactose (D-glucose and D-galactose) was determined using a Ca ion selective electrode. Also, the Ca-sequestering capacity of each component of these mixtures was quantified. The addition of boric acid at pH = 10 enhanced the Ca-sequestering capacity substantially, especially for D-gluconic acid and D-glucaric acid. Apparently the configuration of the vicinal diol moiety at the 3,4-position is of major importance in defining the Ca-sequestering capacity of aldonic and aldaric acids in the presence of borate. The effect of the concentration of NaOH on the Ca-sequestering capacity was evaluated in the range of 1–5 wt.% by titration with 0.1 M calcium acetate. The polyhydroxycarboxylic acids exhibit an optimum Ca-sequestering capacity up to one mol Ca ions per mol carboxylate group at these high pHs.

Article information

Article type
Paper

Green Chem., 1999,1, 231-235

New Ca-sequestering materials . based on the oxidation of the hydrolysis products of lactose

A. Abbadi, K. F. Gotlieb, J. B. M. Meiberg, J. A. Peters and H. van Bekkum, Green Chem., 1999, 1, 231 DOI: 10.1039/A905197J

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