Calcium-phosphate type hydroxyapatite for chromatographic separa

Details Calcium-phosphate type hydroxyapatite for chromatographic separa Calcium-phosphate type hydroxyapatite for chromatographic separa

1986-09-22

1988-11-01

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423309, 423311, 530344, 530412, 530416, 530417, C01B 2532

Patent

active

047819049

ABSTRACT:
A calcium-phosphate type hydroxyapatite for chromatographic separation is in the form of spherulites having a mean particle diameter of 0.5 to 50 .mu.m, preferably 1 to 10 .mu.m. The spherulites are each an aggregate mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. The hydroxyapatite is produced by granulating a calcium-phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400.degree. to 700.degree. C., preferably at 500.degree. to 600.degree. C. The firing is performed by heating the granules in the presence of oxygen or air for a given period of time.

REFERENCES:
patent: 4497075 (1985-02-01), Niwa et al.

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