Document is current
Any future updates will be listed below
-
Authors
Akopova, T. A.
Ivanov, P. L.
Svidchenko, E. A.
Kurkin, T. S.
Popyrina, T. N.
Svischeva, N. B.
Zakharevich, A. A.
Malyk, B. V.
Khavpachev, M. A.
- License Information
-
More Information
Article History
Received: 16 June 2025
Revised: 1 July 2025
Accepted: 5 July 2025
First Online: 1 October 2025
ETHICS APPROVAL AND CONSENT TO PARTICIPATE
: This work does not contain any studies involving human and animal subjects.
: The authors of this work declare that they have no conflicts of interest.
: Fig. SI -1. Light attenuation spectra: (a) 1% solution of gallic acid in 2% AcOH (1—D = 1.4, C = 2E-4 mol/L, pH 2.6) and in water at different dilutions: 2—D = 2, C = 3E-4 mol/L, pH 4; 3—D = 0.2, C = 3E-5 mol/L, pH 4.5; (b) 1% solution of chitosan in 2% AcOH. Fig. SI -2. FT-IR spectra of gallic acid and original chitosan. Fig. SI -3. Wide angle X-Ray diffraction patterns for pristine chitosan (Chs) and the sample, obtained by chitosan and gallic acid co-extrusion (CGA2) plotted in 2θ-range of 10°–30°. Fig. SI -4. First heating run DSC and TGA curves for neat gallic acid. Fig. SI -5. First heating run DSC and TGA curves for Chitosan/Gallic Acid blend (1/0.7 molar ratio) prepared by extrusion at 100°C. Fig. SI -6. Dynamic viscosity versus shear rate curves for chitosan and CGAr samples dissolved in 2% acetic acid at 25°C and 1% polymer concentration. Fig. SI -7. Optical microphotographs of dried aqueous suspension (1 wt % polymer) of samples at GA/chitosan molar ratio of 0.7: (a) after processing in the extruder (CGA3); (b) physical mixing. Fig. SI -8. Optical microphotographs of the 1 wt% aqueous suspension of CGA3 sample: (a) initial suspension with an average size of 64 ± 33 µm after soaking in water for 24 h; (b) after ultrasonic treatment at 23 kHz for 1 min; (c) after repeated ultrasonic treatment and 48 h of swelling; (d) size distribution of the suspended particle in the course of ultrasonic treatment and swelling; (d) the particles rearrangement after ultrasonic treatments and swelling for 96 h. Fig. SI -9. Optical microphotographs of the powder samples after processing in the extruder at molar ratio GA:chitosan of 0.7 and various temperatures (25, 100, 120, and 150°C for CGA1, CGA2, CGA3 and CGA4, respectively); samples dissolved in 2% acetic acid at 1% polymer concentration.
