Funct. Mater. 2021; 28 (3): 512-517.
Effect of sodium chloride on the solubility and transformation behavior of L-glutamic acid
School of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, 132022 Jilin, P.R.China
The effect of NaCl concentration on the kinetics and thermodynamics of L-glutamic acid have been studied. The solubility of each glutamic acid polymorph in the NaCl solution was determined by the gravimetric method; the quantity of each polymorph was determined by the spectral method. The behavior of the polymorphic transformation has also been investigated using Raman and imaging techniques. The particle size of L-glutamic acid during the polymorphic transformation process was measured using a laser particle size analyzer. Experimental data show that NaCl affects the polymorphism of L-glutamic acid. In aqueous solutions without additives at temperatures below 30°C, the alpha form of glutamic acid is spontaneously generated, while in the presence of NaCl, the alpha form is rapidly converted to the beta form.
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