Abstract
A study has been made of the effects of polyvinylpyrrolidone, gelatin and methylcellulose binding agents on the fundamental and tableting properties of a metronidazole-lactose-starch formulation. A material constant, alpha, was derived from the measured values of tensile strength of the materials. The values of alpha for the formulations are lower than that for metronidazole and depend on the nature and concentration of binder present. In terms of tableting properties, alpha supplements the information obtained from the ratios of elastic recovery to plastic compression (ER/PC) and from the brittle fracture index values (BFI) of the materials, although its influence appears to be limited at low values of ER/PC.
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