Biotrans PVDF membranes are naturally hydrophobic polyvinylidene difluoride membrane developed for use in protein transfer and immobilization procedures. The Biotrans PVDF membrane is a pure white microporous solid phase support which undergoes strong hydrophobic interaction with a wide range of proteins. Immobilized proteins can be used directly for protein .Immobilized proteins can be used directly for protein sequencing or amino acid analysis, and can be visually detected with all common staining reagents, including coomassie blue, amido black, ponceau S, and colloidal gold.