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Chiroptic recognition of potassium ion

Wolfbeis, Otto S. ; Opitz, Dieter ; Werner, Tobias ; Ouart, Andrè
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Date of publication of this fulltext: 06 Jun 2011 12:27


The high specificity in the recognition and specific binding of potassium ion by the depsipeptide valinomycin (VM) is exploited for its recognition and quantitation using both circular dichroism (CD) and optical rotation dispersion (ORD). The specific rotation of VM is comparably small (2.34 deg ml g⁻¹ cm⁻¹), so that an 8 µM (= 8.89 mg ml⁻¹) solution of VM in 95% ethanol rotates polarized light ...


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