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  Indian J Med Microbiol
 

Figure 1 : Apparatus for antitussive evaluation by sulfur dioxide gas production. V1: Saturated NaHSO3 solution in 500mL flask. V2: Conc. H2SO4 in burette. V3: Gas cylinder. V4: Water manometer. V5: Desiccator.

Figure 1 : Apparatus for antitussive evaluation by sulfur dioxide gas production. V1: Saturated NaHSO3 solution in 500mL flask. V2: Conc. H2SO4 in burette. V3: Gas cylinder. V4: Water manometer. V5: Desiccator.