FTIR-ATR of aqueous β-alanine: pH effect and molecular dissociation

Ling Zhang, Xiao Wu Zhang, Qi Shen Huang, Yun Hong Zhang*, Qian Shu Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, we present detailed analysis of the dissociation of β-alanine solutions over the pH range of 1.54 to 12.52 using the Fourier transform infrared attenuated total reflection (FTIR-ATR) technique combined with Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS) methods. By applying appropriate spectrum subtraction methods, we obtained FTIR-ATR spectra of the solvated β-alanine as a function of pH. Discernible changes were identified in the absorption region between 1 800 and 1 000 cm-1. The number of components was calculated using singular value decomposition and evolving factor analysis in the complex system.The concentration profiles and the pure spectrum of three species in aqueous solutions in the pH ranging from 1.54 to 12.52 were gained through MCR-ALS constrained optimization. The effect of aqueous solution environment was also investigated in terms of 200 mmol·L-1 NaCl. The dissociation constants of β-alanine in aqueous solutions and NaCl solutions were also determined.

Original languageEnglish
Pages (from-to)479-490
Number of pages12
JournalJournal of Molecular Science
Volume39
Issue number6
DOIs
Publication statusPublished - Dec 2023

Keywords

  • FTIR-ATR
  • MCR-ALS
  • dissociation
  • β-alanine

Fingerprint

Dive into the research topics of 'FTIR-ATR of aqueous β-alanine: pH effect and molecular dissociation'. Together they form a unique fingerprint.

Cite this