They have been widely used as natural colorants due to∗Corresponding author. Tel.: +66 8 57474136; fax: +66 43 743135.E-mail address: sirithons@hotmail.com (S. Siriamornpun).their low toxicity. Anthocyanins have been reported to havehigh antioxidant properties which are correlated with theprevention of chronic diseases in humans (Yang and Zhai,2010; Flanigan and Niemeyer, 2014)