Abstract
The technique of MATR infrared spectroscopy has been used to record the infrared spectra of a variety of barbiturate-containing tablets and capsules. The production of different spectra for preparations containing different active ingredients, and the absence of spectral variations arising from the source of manufacture and the presence of tablet and capsule additives, indicate the technique to have possible application in the identification of tablets and capsules, especially where only small samples (1–2 mg) are available.

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