Bonded phase of silica for solid phase extraction

Details Bonded phase of silica for solid phase extraction Bonded phase of silica for solid phase extraction

1986-08-04

1987-07-14

Therkorn, Ernest G.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210656, 436178, 436527, 436543, 436816, 436901, 530395, 530413, 530417, 530834, B01D 1508

Patent

active

046801219

ABSTRACT:
A bonded phase silica product of the formula: ##STR1## in which ##STR2## is the backbone of a silica gel or controlled pore glass, X is selected from --O--, --S--, ##STR3## each R and R.sup.1 are each independently selected from hydrogen, an alkyl group of from 1 to 3 carbon atoms and --CH.sub.2).sub.m COOR.sup.3, R.sup.2 and R.sup.3 are each independently alkyl of from 1 to 4 carbon atoms, n is an integer of from 2 to 5, p is zero or one and m is an interger of from 1 to 4, is suitable for use in solid phase extraction for cleanup of urine samples for analysis of cannabinoids.

REFERENCES:
patent: 3960521 (1976-06-01), Kruppa
patent: 3987058 (1976-10-01), Saunders
patent: 4242227 (1980-12-01), Nestrick
patent: 4324681 (1982-04-01), House
patent: 4329254 (1982-05-01), Chmielowiec
patent: 4512898 (1985-04-01), Oi
patent: 4522724 (1985-06-01), Ramsden
patent: 4523997 (1985-06-01), Crane
patent: 4540486 (1985-09-01), Ramsden
patent: 4551245 (1985-11-01), Ramsden
M. Elsohly et al, Analysis of the Major Metabolite of .DELTA..sup.9 --Tetrahydrocannabinol in Urine, Journal of Analytical Toxicology, vol. 7, Nov./Dec. 1983, pp. 262-264.
D. Black et al, Urine Cannabinoid Analysis: An Integrated Multi--Method Approach, Journal of Analytical Toxicology, vol. 8, Sep./Oct. 1984, pp. 224-227.

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