Determination of carrageenan in jellies with new methylene blue dye using spectrophotometry, smartphone-based colorimetry and spectrophotometric titration

Abstract

Carrageenan is a seaweed polysaccharide widely used as a food gelling and thickening agent. The New Methylene Blue dye was tested as an analytical reagent for the quantification of carrageenan in commercial jelly samples. The main spectral peaks of the dye decrease with increasing carrageenan-to-dye molar ratio up to 1. Three analytical procedures were tested: (i) spectrophotometric measurement at 590 nm, (ii) smartphone-based color measurement within the RGB color model and (iii) spectrophotometric titration at 625 nm. All the procedures provide straight calibration lines. Spectrophotometry provides better linearity as compared to smartphone-based colorimetry. Range of determination is dependent on type and purity of carrageenan. The spectrophotometric titration procedure provides lower values of limit of determination due to longer optical path used. Typical food additives used in jelly deserts do not interfere significantly with the proposed analytical approach.

Interaction investigation and phase transition of carrageenan/lysozyme complex system

“…Most polysaccharides and proteins belong to polyampholytes. When they are mixed in the same water environment, the state characteristics of the composite system composed of polysaccharides and proteins are related to the interaction between them (Alfaris et al, 2022;Georgilis et al, 2020;Bartlová et al, 2021). With more and more in-depth research on polysaccharide/protein complexes, we found that the interaction between polysaccharides and proteins will affect the structure and stability of the composite system (Hasizah et al, 2021;Luo et al, 2022).…”

Detection of Carrageenan in Cheese Using Lectin Histochemistry

“…Several methods for detecting carrageenan in food have been described in the literature. These include, for example, colorimetric methods [17,48,49]. Soedjak [50] detected carrageenan in milk photometrically with the addition of methylene blue.…”

Application effect of centralized management combined with Information system application management in recycling, cleaning, disinfection and packaging of radiology instruments and reusable medical devices

“…With the development of modern science and technology, the performance and quality of hospital radiology equipment and reusable equipment are getting higher and higher, and the upgrading is becoming faster and faster (Jasmi et al, 2020;Bartlová et al, 2021). However, most domestic equipment management software is for simple operation only, with a lack of equipment dynamic maintenance analysis and processing application, and most of them are only in the development of simple database management application, failing to adapt to the current development of computer hardware technology (Chang et al, 2019;Guo et al, 2015).…”