首页|Influence of protic ionic liquids on hydration of glycine based peptides

Influence of protic ionic liquids on hydration of glycine based peptides

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  • NSTL
  • Elsevier
The structure of water, especially around the solute is thought to play an important role in many biological and chemical processes. Water-peptide and cosolvent-peptide interactions are crucial in determining the structure and function of protein molecules. In this work, we present the H-bonding analysis for model peptides like glycyl-glycine (gly-gly), glycine-L-valine (gly-val), glycyl-L-leucine (gly-leu) and triglycine (trigly) and triethylammonium based carboxylate protic ionic liquids (PILs) in aqueous solutions as well as for peptides in similar to 0.2 mol-L-1 of aqueous PIL solutions in the spectral range of 7800-5500 cm(-1) using Fourier transform near-infrared (FT-NIR) spectroscopy at 298.15 K. The hydration numbers for peptides and PILs were obtained using NIR method of simultaneous estimation of hydration spectrum and hydration number of a solute dissolved in water. The H-bond of water molecules around peptides and PILs are found to be stronger and shorter than those in pure liquid water. We observe that the hydration shell around zwitterions is a clathrate-like cluster of water in which ions entrap. Watery network analysis confirms that singly H-bonded species or NHBs changes to partial or distorted ice-like structures of water in the hydration shell of PILs. The overall water H-bonding in the hydration sphere of PILs increases in the order TEAF < TEAA < TEAG < TEAPy approximate to TEAP < TEAB. The influence of PILs on hydration behavior of peptides is explored in terms of H-bonding, cooperativity, hydrophobicity, water structural changes, ionic interactions etc. (C) 2021 Elsevier B.V. All rights reserved.

Near-infrared spectroscopyPeptidesIonic liquidsHydrogen bondingHydration numberHydration spectraAQUEOUS-SOLUTIONSAMINO-ACIDSSPECTROSCOPIC EVIDENCEINFRARED-SPECTROSCOPYINTERACTION ENERGIESVIBRATIONAL-SPECTRAWATERDIPEPTIDESBEHAVIORFLUORESCENCE

Patil, Kunal R.、Barge, Seema S.、Bhosale, Babasaheb D.、Dagade, Dilip H.

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Shivaji Univ

Rajaram Coll

2022

10.1016/j.saa.2021.120378

Spectrochimica acta

Spectrochimica acta

ISSN：1386-1425
年,卷(期)：2022.265
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