期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/ijms231911381
关键词
Fourier transform infrared spectroscopy; water structure; protein solution; hydrogen bond
资金
- University of Aveiro, CICECO-Aveiro Institute of Materials [UIDB/5011/2020, UIDP/50011/2020]
- national funds through the FCT/MEC [57/2016]
This study provides the first evidence that dissolved globular proteins can alter the arrangement of hydrogen bonds in water, with different proteins having quantitatively different effects. Through spectroscopic analysis and nuclear magnetic resonance techniques, the researchers found strong correlations between solvent acidity and hydrogen bond arrangement in aqueous solutions.
This work presents the first evidence that dissolved globular proteins change the arrangement of hydrogen bonds in water, with different proteins showing quantitatively different effects. Using ATR-FTIR (attenuated total reflection-Fourier transform infrared) spectroscopic analysis of OH-stretch bands, we obtain quantitative estimates of the relative amounts of the previously reported four subpopulations of water structures coexisting in a variety of aqueous solutions. Where solvatochromic dyes can measure the properties of solutions of non-ionic polymers, the results correlate well with ATR-FTIR measurements. In protein solutions to which solvatochromic dye probes cannot be applied, NMR (nuclear magnetic resonance) spectroscopy was used for the first time to estimate the hydrogen bond donor acidity of water. We found strong correlations between the solvent acidity and arrangement of hydrogen bonds in aqueous solutions for several globular proteins. Even quite similar proteins are found to change water properties in dramatically different ways.
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