Separation of peptides on Empore™ thin‐layer chromatography sheets and blotting onto polyvinylidene difluoride membranes with subsequent gas phase sequencing

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Abstract
Methods for the separation of peptides on a new type of thin‐layer chromatography (TLC) sheet and blotting onto polyvinylidene difluoride (PVDF) membranes with subsequent gas phase sequencing are described. For validation, the A and B chain of insulin were chromatographed on EmporeTM TLC sheets and either extracted or blotted onto PVDF membranes. The advantages and disadvantages of thin‐layer chromatography on Empore sheets versus high performance liquid chromatography (HPLC) are discussed, along with the possibility of combining the two methods. In addition, TLC was combined with electrophoresis (finger‐printing) for the separation of complex peptide mixtures. Blotting from TLC sheets onto PVDFmembranes was performed in two ways: contact diffusion and electrophoretic transfer. In our experiments electroblotting was more effective. Amino acid sequence determination of the B chain of insulin was possible both after extraction from the TLC sheet and after blotting onto PVDF membranes. In the former case, liquid phase sequencing and, in the latter case, gas phase sequencing was performed. The possibility to blot from TLC sheets onto membranes, e.g. PVDF, may prove useful in many fields, for example in biochemistry, and in molecular and cell biology.