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- W1597789954 abstract "Abstract The solubility of glycine, diglycine, and triglycine was investigated in water-ethanol mixtures (20% and 50% ethanol) as a function of the temperature. The transfer free energy, ΔFtrconh, for the peptide group was evaluated and the separate enthalpy and entropy components of the transfer process were determined. In 20% ethanol solutions, the hypothesis of additivity of the contribution of various molecular groups to the transfer parameters was verified. Values obtained as the difference triglycine-diglycine in 20% ethanol at 25° were ΔFtrconh = +120 cal per mole, ΔStrconh = -1.7 e.u., ΔHtrconh = -390 cal per mole. These values appear to be in excellent agreement with previous results obtained for the coil → helix transformation of poly-l-ornithine in 20% ethanol solutions. It has been confirmed that helical stabilization in mixed solvents is an entropic effect, arising from the negative value of the transfer entropy, ΔStrconh (from water to water-organic solvent mixtures)." @default.
- W1597789954 created "2016-06-24" @default.
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- W1597789954 date "1973-08-01" @default.
- W1597789954 modified "2023-09-30" @default.
- W1597789954 title "On the Temperature Coefficient of the Solubility of Some Glycyl Peptides in Water-Ethanol Mixtures" @default.
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- W1597789954 doi "https://doi.org/10.1016/s0021-9258(19)43623-5" @default.
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