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DIFFERENTIAL GEL PERMEATION CHROMATOGRAPHY

A new technique called Differential Gel Permeation Chromatography (DGPC), in which a reference solution is used as eluent and the solution to be analyzed as the injected solution, is proposed. It can detect minute differences between the reference solution and the analyzed solution. A null signal indicates that the reference solution and the analyzed solution are identical and a nonzero signal reflects the detailed differences between the reference and the analyzed solution. Two examples, concentration identification of five ethanol solutions and brand identification of three lubricant oils, are given to show the application of the DGPC method. The potential application of the DGPC method to the identification of counterfeit products is also discussed.