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...Introduction it is a process of separating component s from the given crude drug by using gaseous mobile phase involves sample being vaporized and injected onto head chromatographic column transported through flow inert itself contains liquid stationary which adsorbed surface an solid two types gas chromatography here while used for separation low molecular gases e g air components h cs co rare oxides nitrogen retained on as adsorption or chemical bonding principles principle in gc partition mixture to be separated converted vapour mixed with more soluble travel slower eluted later less travels faster out first no has same coefficient conditions so are according their ratio solubility substance distributed between immiscible liquids at constant temperature instrumentation carrier he common n argon injection port micro syringe columns detectors thermal conductivity tcd electron capture detector ecd flame ionization fid photometric cylinder tank fitted pressure controller control gauge t...