The dissolution of hyaluronan in water leads to its degradation, and as a result its molecular weight decreases. The degradation of hyaluronan is mainly influenced by temperature, solution composition, and also its pH. This study describes the influence of Hofmeister series ions on hyaluronan behaviour and hyaluronan film swelling by solutions of these ions. It was found that Hofmeister ions show lyotropic effects influencing the entanglement of hyaluronan coils and their expansion from solid polymer films into swollen gel state. The hydrophobic and hydrophilic interactions in the structure of hyaluronan macromolecules are represented by the mutual diffusion coefficient D(c), the mean mutual diffusion coefficient D(s), the expansion work of coil swelling RA(delta,s), the activation enthalpy of diffusion connected with swelling H(D,s) and kinematic viscosity of hyaluronan-ions solutions nu.
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http://dx.doi.org/10.3390/molecules13051025 | DOI Listing |
Eur J Pharm Biopharm
January 2025
BASF SE, Carl-Bosch-Strasse 38, 67056 Ludwigshafen am Rhein, Germany. Electronic address:
Poloxamer 338 is used as versatile thermo-responsive gelling agent in topical and sub-cutaneous applications. Due to application specific needs a gel point below body or even below room temperature is required. The influence of inorganic salts and active pharmaceutical ingredients (APIs) on the gel point was investigated using oscillatory rheology to identify the driving forces and predictors for gel point alteration.
View Article and Find Full Text PDFAdv Sci (Weinh)
December 2024
Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany.
Understanding the salt effects on solvation behaviors of thermoresponsive polymers is crucial for designing and optimizing responsive systems suitable for diverse environments. In this work, the effect of potassium salts (CHCOOK, KCl, KBr, KI, and KNO) on solvation dynamics of poly(4-(N-(3'-methacrylamidopropyl)-N,N-dimethylammonio) butane-1-sulfonate) (PSBP), poly(N-isopropylmethacrylamide) (PNIPMAM), and PSBP-b-PNIPMAM films is investigated under saturated water and mixed water/methanol vapor via advanced in situ neutron/optical characterization techniques. These findings reveal that potassium salts enhance the films' hygroscopicity or methanol-induced swellability.
View Article and Find Full Text PDFColloids Surf B Biointerfaces
December 2024
Department of Chemistry "Ugo Schiff" and CSGI, University of Florence, Sesto Fiorentino, Firenze 50019, Italy. Electronic address:
Intermolecular forces determine complex chemical structures of exquisite intricacy, like proteins. However even the most advanced theories we have so far rely on too drastic approximations to explain them. Some crucial aspects that dictate structure, specific ion and solvent effects are not accommodated.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Marine Food, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Guangdong Provincial Science and Technology Innovation Center for Subtropical Fruit and Vegetable Processing, Zhanjiang 524008, China. Electronic address:
Soft Matter
December 2024
Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77840, USA.
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