Author:
Ziółkowska Dorota,Lamkiewicz Jan,Shyichuk Alexander
Abstract
Carrageenan is a polysaccharide of a plant origin, commonly used as a thickening and gelling agent in the food, pharmaceutical, and cosmetic industries. Due to the negative charges of its sulfate groups, carrageenan macromolecules strongly interact with oppositely charged polyions. The ionic complexes of carrageenan with poly(diallyldimethylammonium chloride) were obtained at the molar ratios 4:1, 2;1, 1:1, 1:2, and 1:4. The structure and characteristics of the polyanion-polycation associates were studied by XRD, IR, optical microscopy, and via sedimentation and particle size measurements. It was found that the suspended particles flocculate and settle fastest when the molar ratio of the polyions is near 1:1. Turbidimetric titration experiments enabled us to measure the molar ratio of cationic to anionic groups at the onset of flocculation, and the value in question was found to be 1:1.32. In other words, a mass of 511 mg carrageenan corresponds to one millimole of ester sulfate (monobasic) groups. The measurement of the onset of flocculation has been employed for the accurate determination of carrageenan in real samples of food products. The color and turbidity of the sample do not interfere with the determination results.
Subject
Chemistry (miscellaneous),Analytical Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Molecular Medicine,Drug Discovery,Pharmaceutical Science
Reference32 articles.
1. Neamtu, B., Barbu, A., Negrea, M.O., Berghea-Neamțu, C.Ș., Popescu, D., Zăhan, M., and Mireșan, V. (2022). Carrageenan-Based Compounds as Wound Healing Materials. Int. J. Mol. Sci., 23.
2. Bioactive Polysaccharides from Red Seaweed as Potent Food Supplements: A Systematic Review of Their Extraction, Purification, and Biological Activities;Carbohydr. Polym.,2022
3. Determination of Carrageenan by Means of Photometric Titration with Methylene Blue and Toluidine Blue Dyes;Carbohydr. Polym.,2017
4. Determination of Carrageenan in Jellies with New Methylene Blue Dye Using Spectrophotometry, Smartphone-Based Colorimetry and Spectrophotometric Titration;Food Sci. Technol.,2021
5. Ion Association of Carrageenan with Pinacyanol Dye for Analytical Purpose;Mol. Cryst. Liq. Cryst.,2020
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