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http://dx.doi.org/10.9721/KJFST.2018.50.1.21

Changes in chemical properties, antioxidant activities, and cytotoxicity of turmeric pigments by thermal process  

Song, Eiseul (Division of Applied Food System, College of Natural Science, Seoul Women's University)
Kang, Smee (Division of Applied Food System, College of Natural Science, Seoul Women's University)
Hong, Jungil (Division of Applied Food System, College of Natural Science, Seoul Women's University)
Publication Information
Korean Journal of Food Science and Technology / v.50, no.1, 2018 , pp. 21-27 More about this Journal
Abstract
Turmeric oleoresin, extracted from the rhizome of Curcuma longa L., is a widely-used natural food colorant. Curcuminoids, the major pigments in turmeric, which include curcumin, demethoxycurcumin (DMC), and bisdemethoxycurcumin (BMC), possess various physiological activities. In the present study, changes in the chemical properties, antioxidant activities, and cytotoxicity of turmeric pigments upon heating were investigated. Color intensity of turmeric was significantly reduced after heating. Residual levels of curcumin, DMC, and BMC after 15 min of heating at $95^{\circ}C$ were 11.9, 37.4, and 77.3% respectively. Scavenging activities of turmeric against 2,2'-azobis-3-ethyl-benz-thiazoline-6-sulfonic acid (ABTS), 2,2-azobis (2-amidinopropane) hydrochloride (AAPH) peroxyl radicals, and nitrite were significantly enhanced after heating, while 2,2-diphenyl-1-picryl-hydrazyl (DPPH) radical scavenging activity remained unaffected. Generation of $H_2O_2$ from turmeric was increased via thermal decomposition. Cytotoxicity of turmeric pigments against colon cancer and normal intestinal cells was reduced significantly after heating. The results indicate that thermal processing affects chemical properties and bioactivities of turmeric pigments. These effects should be considered during the processing of foods containing turmeric pigments.
Keywords
turmeric; curcuminoid; heating; antioxidant activity; cytotoxicity;
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