Calorimetric determination of the enthalpy change for the binding of xanthene dyes to polycations in aqueous solutions
β Scribed by I. Sardharwalla; J.B. Lawton
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 679 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0032-3861
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The enthalpy change associated with the isothermal pH-induced uncharged coil-to-helix transition AH; in poly(L-ornithine) in 0.1 N KCl has been determined calorimetrically to be -1530 f 210 and -1270 f 530 cal/mol a t loo and 25OC, respectively. Titration data provided information about the state of
Guanidinium cations are a prominent recognition motif for oxoanion binding both in Nature and in abiotic systems. However, simple ion pairing based on alkyl guanidinium cations is not strong enough to achieve an efficient complexation in aqueous solvents. Nature uses the less polar microenvironment