IN-VITRO HYDROLYSIS OF PHYTATE AT 95-DEGREES-C AND THE INFLUENCE OF METAL-ION ON THE RATE

Authors
BULLOCK JI DUFFIN PA NOLAN KB
Citation
Ji. Bullock et al., IN-VITRO HYDROLYSIS OF PHYTATE AT 95-DEGREES-C AND THE INFLUENCE OF METAL-ION ON THE RATE, Journal of the Science of Food and Agriculture, 63(2), 1993, pp. 261-263
Citations number
8
Categorie Soggetti
Agriculture,"Food Science & Tenology
Journal title
Journal of the Science of Food and Agriculture → ACNP
ISSN journal
00225142
Volume
63
Issue
2
Year of publication
1993
Pages
261 - 263
Database
ISI
SICI code
0022-5142(1993)63:2<261:IHOPA9>2.0.ZU;2-S
Abstract
The in vitro hydrolysis of phytate at 95-degrees-C across the pH range 1-12 is reported. The reaction is slow. The first order rate constant varied from 3.98 x 10(-4) min-1 at pH 1 to 0.28 x 10(-4) min-1 at pH 12 with a maximal value of 8.74 x 10(-4) min-1 at pH 4. The reaction i s very similar in rate and profile to that of a phosphoric acid ester anion, [(RO)PO3H]-. The 12 metal ions tested had little influence on t he hydrolysis reaction although the phytate; metal ion ratio was neces sarily high because of the insolubility of phytate metal salts at lowe r ratios.