Terahertz tyrosine modes

T J Sanders; J L Allen; R Plathe; D Appadoo; J Horvat; R A Lewis

doi:10.1016/j.saa.2022.121970

Terahertz tyrosine modes

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Feb 5:286:121970. doi: 10.1016/j.saa.2022.121970. Epub 2022 Oct 19.

Authors

T J Sanders¹, J L Allen², R Plathe³, D Appadoo³, J Horvat², R A Lewis²

Affiliations

¹ Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia. Electronic address: tjs804@uowmail.edu.au.
² Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia.
³ Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Rd Clayton, VIC 3168, Australia.

PMID: 36302282
DOI: 10.1016/j.saa.2022.121970

Abstract

We have measured the terahertz spectrum of pure l-tyrosine at nineteen temperatures in the range 6K to 300K using a synchrotron as the source of radiation. By fitting the temperature dependence of the observed modes with a Bose-Einstein model, we determine unequivocal low-frequency modes of l-tyrosine at absolute zero temperature occur at 1.02 ± 0.01, 1.61 ± 0.01, 1.97 ± 0.01, and 2.19 ± 0.01THz. This determination is consistent with the more reliable of the earlier measurements. We conclude that many of the recently reported features in the terahertz spectrum of l-tyrosine are experimental artefacts.

Keywords: 4-hydroxy phenylalanine; Amino acid; Bose–Einstein; Redshift; THz; Terahertz; Tynchrotron; Tyr; Tyrosine; Y; l-tyrosine.

MeSH terms

Temperature
Tyrosine*

Substances

Tyrosine