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Reflux disease is one of the most frequently diagnosed conditions in developed countries. The problem is both the acidic content of the stomach and the alkaline content of the intestines. In each case, the oesophageal mucosa is destroyed. I analysed hydrogels that prevent irritation of the oesophageal mucosa. Specifically, I investigated the effect of chitosan and sodium alginate on the properties...
Chitosan and chitin are promising biopolymers used in many areas including biomedical applications, such as tissue engineering and viscosupplementation. Chitosan shares similar properties with hyaluronan, a natural component of synovial fluid, making it a good candidate for joint disease treatment. The structural and energetic consequences of intermolecular interactions are crucial for understanding...
We evaluated the effects of chitosan of different molecular weights on the quality of Kamchatka berries after harvest and storage. Chitosan with lower molecular weights (from 3 to 21 kDa) positively influenced the soluble solid content after harvest. However, chitosan had no significant effect on titratable acidity after harvest. Regardless of the chitosan molecular weight, the berries contained from...
We investigated the extraction of chitin with various solvents and changes in the amount of chitin and its molecular mass at different stages of maturity in the fruiting bodies of the fungi Laetiporus sulphureus, Tyromyces chioneus, Oudemansiella mucida, Lycoperdon perlatum, and Fomitopsis betulina. We extracted chitin from crushed mushroom fruiting bodies with 25% hydrochloric acid at 0°C. We characterised...
The troublesome symptoms of gastro-oesophageal reflux disease are a serious health, medical, and social problem for patients. The main problem is gastro-oesophageal acid reflux. In this study, I investigated hydrogels that could prevent the destruction of the oesophageal mucosa. I investigated the effect of chitosan and poloxamer 407 on the protective properties of gels. The addition of chitosan to...
We obtained binary polyelectrolyte complexes containing chitosan from Bombyx mori and collagen with a mass ratio of 10:1; 10:2, and 10:3. During the interaction between the macromolecules, due to the compensation of the positive charges of chitosan with the negative charges of collagen, the zeta potential of the solutions of polyelectrolyte complexes changed from +15.2 to +5.67 mV. We revealed the...
Excess boron in soil is often found in dry agricultural areas and is one of the factors limiting crop yields. Polysaccharide-based biostimulants can mitigate the harmful effects of environmental stresses on plants. I performed this study under controlled greenhouse conditions to understand the response of pepper plants under boron stress to treatment with water-soluble chitosan (WSC). I watered plants...
Kamchatka berries contain many valuable organic and mineral compounds. However, the ripe berries are not very firm and have low transport resistance. We aimed to study the effect of chitosan solutions of different molecular weights on the growth, yield, and quality of Kamchatka berries. Chitosan with lower molecular weights, 3 and 12 kDa, stimulated plant growth, while those with molecular weights...
We investigated the efficiency of chitosan (CH) and meta-topolin (mT) on in vitro growth and adaptation to greenhouse conditions of Vitis vinifera cv. Johanniter and cv. Hibernal. After the initiation stage, we transferred explants to Woody Plant Media (WPM) with chitosan (molecular weight 3.33 kDa) at a concentration of 10, 20, and 40 ppm or to WPM with mT at a concentration of 0.5, 1.0, and 2.0...
We investigated the adsorption of silver(I) from silver nitrate (AgNO3) and silver sulphate (Ag2SO4). We compared the adsorption ability of chitosan in the form of hydrogel beads with that of chitosan acetate – an initial solution from which the beads were derived. We developed a model of adsorption kinetics, assuming the simultaneous occurrence of the diffusion process and the chemical reaction....
We explored the multiple uses of chitosan in the form of beads and beech sawdust immobilised in chitosan to remove anionic (Reactive Yellow 85 and Reactive Blue 5) and cationic (Basic Violet 10 and Basic Green 4) dyes. For both anionic dyes, with the next adsorption/desorption cycle, the amount of dye accumulated in the adsorbent increased, which resulted in a decrease in the desorption efficiency...
The troublesome symptoms of gastro-oesophageal reflux disease are a serious health, medical, and social problem for patients. The main problem is gastro-oesophageal acid reflux. In this study, I investigated hydrogels that could prevent the destruction of the oesophageal mucosa. I investigated the effect of chitosan and poloxamer 407 on the protective properties of gels. The addition of chitosan to...
In the present work, we successfully used electrophoretic deposition to produce a new composite chitosan-copper(II) [Cu(II]) ion coating on grade 4 titanium (Ti). We prepared the coating with an environmentally friendly in situ chemical reduction process from a 2% (v/v) aqueous acetic acid solution with 1 g dm–3 chitosan and 10 g dm–3 copper acetate at 20 V for 300 s at room temperature. We evaluated...
We created composite materials by using a straightforward method, combining chitosan, iodine, and bismuth. We used two chitosan with two different molecular masses. We used iodine in the composites as chitosan iodide and bismuth in the form of tetraiodobismuthanuide. We analysed the resulting materials with scanning electron microscopy, X-ray diffraction, temperature-programmed desorption mass spectrometry,...
We analysed the feasibility of using unmodified chitin exoskeletons and moults of mealworms (Tenebrio molitor) as adsorbents to remove cationic dyes – Basic Violet 10 (BV10) and Basic Red 46 (BR46) – from aqueous solutions. We evaluated the characteristics of the adsorption materials using Fourier-transform infrared spectroscopy and determining the pH of the point of zero charge (pHPZC); the pH effect...
We evaluated the effects of chitosan of different molecular weights on the quality of Kamchatka berries after harvest and storage. Chitosan with lower molecular weights (from 3 to 21 kDa) positively influenced the soluble solid content after harvest. However, chitosan had no significant effect on titratable acidity after harvest. Regardless of the chitosan molecular weight, the berries contained from...
This study evaluated hydrogels containing Celugel, 3% hop cone extract obtained from Humulus lupulus L. using supercritical carbon dioxide extraction substrate, and 1% and 2% chitosan for dermatological application to treat inflammatory skin conditions. The presence of chitosan significantly affected the rheological properties of the formulations, including their dynamic viscosity, hardness, consistency,...
We determined the in vitro corrosion resistance of the composite chitosan-silver(I) [Ag(I)] ion coating on the cobalt-chromium-molybdenum (CoCrMo) dental alloy in a 0.9% sodium chloride (NaCl) solution at 37°C. We obtained the novel composite chitosan–Ag(I) ion coating by electrophoretic deposition at 20 V for 30 s at room temperature in a 2% (v/v) aqueous solution of acetic acid with 1 g dm–3 chitosan...
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