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Organic Ligand Effects on Enzymatic Dephosphorylation of myo-Inositol Hexakis Dihydrogenphosphate in Dairy Wastewater

USDA Agricultural Research Service, Animal Manure and By-Products Laboratory, BARC-East, 10300 Baltimore Avenue, Beltsville, MD 20705

View larger version (43K): [in a new window]   Fig. 1. Effect of non-IP6 organic ligands (LIGND), LIGND to myo-inositol 1,2,3,5/4,6-hexakis dihydrogenphosphate (IP6) mole ratios, and suspension pH on the dephosphorylation of IP6 by Aspergillus ficuum phytase EC 3.1.3.8 at four levels of IP6 counterion. (A) 0, (B) 0.25, (C) 0.75, and (D) 1.5 mM Al3+. Error bars indicate mean ± standard deviation.

View larger version (41K): [in a new window]   Fig. 2. Effect of non-IP6 organic ligands (LIGND), LIGND to myo-inositol 1,2,3,5/4,6-hexakis dihydrogenphosphate (IP6) charge ratios, and equivalent LIGND to IP6 mole ratios on the dephosphorylation of IP6 by Aspergillus ficuum phytase EC 3.1.3.8 at four levels of IP6 counterion. (A) 0, (B) 0.25, (C) 0.75, and (D) 1.5 mM Al3+ at suspension pH 4.5. Error bars indicate mean ± standard deviation.

View larger version (41K): [in a new window]   Fig. 3. Effect of non-IP6 organic ligands (LIGND), LIGND to myo-inositol 1,2,3,5/4,6-hexakis dihydrogenphosphate (IP6) charge ratios, and equivalent LIGND to IP6 mole ratios on the dephosphorylation of IP6 by Aspergillus ficuum phytase EC 3.1.3.8 at four levels of IP6 counterion. (A) 0, (B) 0.25, (C) 0.75, and (D) 1.5 mM Al3+ at suspension pH 6. Error bars indicate mean ± standard deviation.

View larger version (36K): [in a new window]   Fig. 4. Effects of non-IP6 organic ligands (LIGND) on the inhibition of myo-inositol 1,2,3,5/4,6-hexakis dihydrogenphosphate (IP6) dephosphorylation by Aspergillus ficuum phytase EC 3.1.3.8 by polyvalent counterions in 100 g total solid L–1 dairy manure suspension. The IP6 counterion concentrations ranged from 0 to 1.5 mM. (A) 0, (B) 0.25, (C) 0.75, and (D) 1.5 mM Ca2+, Al3+, and Fe3+. Dashed lines represent relative concentration of PO4–P in untreated manure suspensions that had no added counterion and no added IP6.