A method for the determination of binding constants by electrospray ionization mass spectrometry.
Anal Chem 2000;
72:5411-6. [PMID:
11080894 DOI:
10.1021/ac000540e]
[Citation(s) in RCA: 129] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new method for the determination of binding constants using electrospray ionization mass spectrometry is presented. The intensity of a reference complex with a known log K value is monitored before and after addition of a second host or guest. On the basis of the change in intensity of the reference complex and extrapolation from a calibration curve, the log K value is then derived for the complex of interest using a set of simultaneous equilibrium equations. Binding constants of several crown ether-alkali metal cation complexes that were previously studied were determined to validate this strategy. Log K values for complexes involving dibenzo-16-crown-5 and its sym-oxyacetate derivative with Na+ or K+ were also determined.
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