title: Acoustic absorption due to proton transfer in solutions of proteins, peptides and amino acids at neutral pH.
abstract: Measurements of ultrasonic absorption in the frequency range 2 to 60 MHz have been made on solutions of the amino acid histidine, dipeptides glycyl tyrosine and histidyl tyrosine, and proteins lysozyme and bovine serum albumin. Measurements were carried out at 37 degrees C and covered the pH range 6.8 to 7.7. Mechanisms for the observed excess acoustic absorption involving bimolecular and intramolecular proton transfer are considered.
authors.affiliation: Ultrasonics and Digital Signal Processing Laboratory, Keele University, Staffordshire, United Kingdom.
authors.forename: A K
authors.initials: AK
authors.lastname: Holmes
authors.forename: R E
authors.initials: RE
authors.lastname: Challis
mesh_terms: D000162:Acoustics; D000596:Amino Acids; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D011506:Proteins; D011522:Protons
chemical_list: D000596:Amino Acids; D011506:Proteins; D011522:Protons