Coffee and tea. Differential spectrometric determination of caffeine in soluble coffee and in drug combinations

Ferren, W.P.; Shane, N.A.; Ferren, W.P; Shane, N.A

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Coffee and tea. Differential spectrometric determination of caffeine in soluble coffee and in drug combinations

Ferren, W.P.; Shane, N.A.

Journal - Association of Official Analytical Chemists 51(3): 573-577

1968

ISSN/ISBN: 0004-5756

Accession: 024348550

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Summary

A differential spectrophotometric procedure is described for determining caffeine in food and beverage materials and in drug dosage combinations. The method eliminates the necessity for preliminary separations. The procedure was applied to soluble coffee samples and to APC. Recovery of caffeine from soluble coffee was better than 95%; results compared favorably with the official micro Bailey-Andrew method. Results for APC were not as good; apparently phenacetin is the limiting factor. The method may be more suitable for other drug combinations or for certain types of automated analyses.