Features of L-Menthol Crystallization in Optically Active Medium Based on L- and D-Asparaginate Chitosan

Anna B. Shipovskaya orcid (Login required)
Saratov National Research State University named after N.G. Chernyshevsky, Russia

Natalia O. Gegel orcid
Saratov National Research State University named after N.G. Chernyshevsky, Russia

Xenia M. Shipenok orcid
Saratov National Research State University named after N.G. Chernyshevsky, Russia

Paper #3582 received 15 Jan 2023; revised manuscript received 2 Feb 2023; accepted for publication 9 Feb 2023; published online 27 Feb 2023.

DOI: 10.18287/JBPE23.09.010305


The phase separation kinetics of an ethanolic L-menthol solution in an aqueous solution of optically and biologically active chitosan L- and D-aspartate was studied. It has been established that this process proceeds according to the extraction crystallization mechanism and combines two types of phase separation, namely: liquid–liquid and liquid–crystal. The effect of aspartic acid stereoisomer, chitosan molecular weight, and polymer: acid ratio on the optical, structural-morphological, and dimensional characteristics of dispersed phase droplets at the initial stage of phase separation and crystal aggregates of the L-menthol condensed phase at the final stage was assessed. In the chitosan D-aspartate medium, as well as with an increase in the concentration of components in the optically active medium and the molecular weight of the polymer, the rate of phase separation, the size of droplets and particles increase. It has been suggested that the system under study is promising for encapsulating hydrophobic drugs, creating chirooptic waveguides, and sensors for biomedical purposes, as well as developing new methods for studying the fundamental principles of phase separation in intracellular regulation of membraneless organelles and subcellular organization of biosystems, including under stress conditions of a living organism underlying the development of new pharmaceuticals to treat rare and currently incurable diseases.


chitosan; L- and D-aspartic acid; salt formation; L-menthol; phase separation; extraction crystallization; spherulites; intracellular regulation; subcellular organization

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