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. 2001 Aug;57(9):1745-50.
doi: 10.1016/s1386-1425(01)00409-7.

Effects of cyclodextrins on the complexation between Methylene Blue and tetrakis(4-sulfonatophenyl)porphyrin in aqueous solutions

S Hamai  1 , H Satou
Affiliations

Effects of cyclodextrins on the complexation between Methylene Blue and tetrakis(4-sulfonatophenyl)porphyrin in aqueous solutions

S Hamai et al. Spectrochim Acta A Mol Biomol Spectrosc. 2001 Aug.

Abstract

In aqueous solutions buffered at pH 10.1, Methylene Blue (MB) forms a complex with tetrakis(4-sulfonatophenyl)porphyrin (TSPP). The equilibrium constant for the formation of the MB-TSPP complex has been evaluated to be 2.35 x 10(5) mol(-1) dm3 from the fluorescence quenching of MB by TSPP. Effects of alpha-, beta-, and gamma-cyclodextrin (CD), and heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin on the complexation between MB and TSPP have been examined by means of absorption and fluorescence spectroscopy. The binding of CDs to TSPP and/or MB in the MB-TSPP complex causes the dissociation of the MB-TSPP complex.

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