1. Photochemical Reactions in Dialdehyde Starch
- Author
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Dorota Chełminiak-Dudkiewicz, Katarzyna Węgrzynowska-Drzymalska, Marta Ziegler-Borowska, Jolanta Kowalonek, and Halina Kaczmarek
- Subjects
Photochemistry ,Ultraviolet Rays ,Pharmaceutical Science ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Aldehyde ,Article ,dialdehyde starch (DAS) ,Analytical Chemistry ,Modified starch ,Contact angle ,lcsh:QD241-441 ,chemistry.chemical_compound ,Crystallinity ,lcsh:Organic chemistry ,Drug Discovery ,Spectroscopy, Fourier Transform Infrared ,Dialdehyde starch ,Physical and Theoretical Chemistry ,Potato starch ,chemistry.chemical_classification ,starch modification ,Sodium periodate ,dialdehyde starch (DAS), cross-linkers ,Organic Chemistry ,food and beverages ,Starch ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,chemistry ,Chemistry (miscellaneous) ,Sodium iodide ,Microscopy, Electron, Scanning ,Molecular Medicine ,surface properties ,cross-linkers ,0210 nano-technology ,UV-irradiation - Abstract
In this study potato and corn starch were subjected to oxidation, using sodium periodate, to obtain dialdehyde starch (DAS) containing different amount of aldehyde groups. The obtained modified starch samples have been characterized with chemical analysis, scanning electron microscopy (SEM) and ATR-FTIR spectroscopy. Then, the samples were exposed to polychromatic UV radiation and the course of photochemical reaction has been monitored with ATR-FTIR spectroscopy. The surface properties of the native and dialdehyde starch before and after UV-irradiation have been determined by contact angle measurements and calculation of surface free energy. The crystallinity of the samples has been estimated with X-ray diffraction (XRD). It has been proved that the dialdehyded corn starch contained a higher amount of functional groups was more photostable than the oxidized potato starch. Sodium iodide(V), firmly bound to DAS macromolecules, has been found to have a significant effect on the photooxidative degradation of the tested systems. In addition, the mechanism of photoinduced reactions in the dialdehyde starch has been proposed.
- Published
- 2018
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