Chromatography is widely used for qualitative and quantitative analysis of phytochemicals and biological samples. Gas chromatography (GC) measures complex mixtures of volatile substances, which vaporize without decomposition. It is also a widely used instrument for analysis of solid, liquid and gaseous samples. This technique can provide information about the qualitative and quantitative composition of both inorganic and organic analytes in complex mixtures, their molecular structures, isotopic ratios of atoms in samples and the structure and composition of solid surfaces. The method has been...