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...Principles a gaseous mobile phase flows under pressure through heated tube either coated with liquid stationary or packed onto solid support the analyte is loaded head of column via injection port where it evaporates lt then condenses at which lower temperature oven held constant programmed to rise gradually once on separation mixture occurs according relative lengths time spent by its components in monitoring effluent can be carried out variety detectors introduction use gas chromatography gc as quantitative technique analysis drugs has declined importance since advent hplc and increasing sophistication this however does still have role certain types broad application qualitative currently dominates analyses pharmaceutical industry strengths may overlooked capillary capable performing much more efficient separations than although limitation that compounds being analysed must volatile rendered formation suitable derivative also thermally stable widely used environmental science brewing...