Abstract
This study focused on evaluating a technique for the psyllium husk mucilage (PHM) purification with simultaneous microencapsulation of curcumin. PHM was extracted with water and purified with ethanol. For the mucilage purification and simultaneous microencapsulation, an ethanolic solution of curcumin was used. After dehydration, the samples were analysed by instrumental techniques and evaluated for thermal stability. The presence of curcumin in the solution did not impair the yield of precipitated polysaccharide. Interactions of the dye and carbohydrates were confirmed by displacement of peaks in FT-IR and FT-Raman spectroscopy. The onset temperature of degradation of microcapsules was superior to that of curcumin. Thermal stability in solution at 90°C also improved. After 300 minutes of heating, the microcapsules had a remnant curcumin content exceeding 70%, while, in standard sample, the remaining curcumin content was 4.46%. Thus, the developed technique was successful on purification of PHM and microencapsulation of curcumin.
Highlights
Curcumin is the main phenolic dye extracted from turmeric
Simple mixture samples exhibited spectra very similar to curcumin, without significant changes and, as the intensity of psyllium husk mucilage (PHM) peaks was much smaller than intensity of the curcumin peaks, they were not visible in the spectrum of the simple mixture. These results indicate that purification process of psyllium mucilage with simultaneous microencapsulation of curcumin is able to promote interaction of the coulorant molecule with the polysaccharide of the mucilage
PHM arabinoxylan precipitation promotes incorporation of 56% of the curcumin in solution. It interacts with the dye and improves the coulorant thermal stability
Summary
Curcumin is the main phenolic dye extracted from turmeric This dye has low water solubility and low stability characteristics that make its use in food products unfeasible [1]. Microencapsulation technique protects solids, liquids or gases from environmental factors such as oxygen, light, and moisture and releases them in specific conditions [5] [6]. This technology may lead to benefits such as increased stability during storage and improve the water solubility of colorant compounds [6]. Microcapsules may have different dimensions and shapes This variation is due the encapsulating agent used and the encapsulation process conditions [7].
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