title: Standard Thermodynamic Functions of TripeptidesN-Formyl-l-methionyl-l-leucyl-l-phenylalaninol andN-Formyl-l-methionyl-l-leucyl-l-phenylalanine Methyl Ester.
abstract: The heat capacities of tripeptidesN-formyl-l-methionyl-l-leucyl-l-phenylalaninol (N-f-MLF-OH) andN-formyl-l-methionyl-l-leucyl-l-phenylalanine methyl ester (N-f-MLF-OMe) were measured by precision adiabatic vacuum calorimetry over the temperature range fromT= (6 to 350) K. The tripeptides were stable over this temperature range, and no phase change, transformation, association, or thermal decomposition was observed. The standard thermodynamic functions: molar heat capacityCp,m, enthalpyH(T) -H(0), entropyS(T), and Gibbs energyG(T) -H(0) of peptides were calculated over the range fromT= (0 to 350) K. The low-temperature (T≤ 50 K) heat capacities dependencies were analyzed using the Debye's and the multifractal theories. The standard entropies of formation of peptides atT= 298.15 K were calculated.
authors.affiliation: Lobachevsky State University of Nizhni Novgorod , 23/5 Gagarin Avenue, 603950, Nizhni Novgorod, Russia.
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Markin
authors.affiliation: Massachusetts Institute of Technology , 150 Albany Street, Cambridge, Massachusetts 02139, United States.
authors.forename: Evgeny
authors.initials: E
authors.lastname: Markhasin
authors.affiliation: Lobachevsky State University of Nizhni Novgorod , 23/5 Gagarin Avenue, 603950, Nizhni Novgorod, Russia.
authors.forename: Semen S
authors.initials: SS
authors.lastname: Sologubov
authors.affiliation: Lobachevsky State University of Nizhni Novgorod , 23/5 Gagarin Avenue, 603950, Nizhni Novgorod, Russia.
authors.forename: Natalia N
authors.initials: NN
authors.lastname: Smirnova
authors.affiliation: Massachusetts Institute of Technology , 150 Albany Street, Cambridge, Massachusetts 02139, United States.
authors.forename: Robert G
authors.initials: RG
authors.lastname: Griffin