Abstract
Theophylline (Th) has been selectively conjugated to the four amino groups of melittin (Mel) by solid phase peptide synthesis. The cytolytic activity of the resultant Th-Mel compounds was tested on liposomes trapping the bovine serum albumin (BSA) conjugate with 4,7-bis(chlorosulfophenyl)-1,10-phenanthrol ine-2,9-dicarboxylic acid (BCPDA). The loss of lytic activity was the highest for Th-K7-Mel. Th-G1-Mel retains almost the same lytic activity as Mel. A homogeneous liposome time-resolved fluoroimmunoassay (LITRFIA) of Th in serum has been carried out with Th-G1-Mel between 5 ng and 10 microg.
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