Color canincreasethesensoryqualityoffood,whichisalsoan
important evaluatingindicatorforconsumertojudgethefresh-
ness oftheproducts.Asonecategoryoftheessentialadditivesin
food industry,colorantsareusuallyclassified aseithernaturalor
synthetic. Syntheticcolorantsgenerallyhaveahighertinctorial
strength thannaturalcolorants;what'smore,syntheticcolorants
areusuallywater-soluble,relativelystableandnoteasilyde-
stroyedduringthefoodprocessingprocess [1,2]. Thesefeatures,
togetherwiththeirlowerprice,makesyntheticcolorantsmore
widely usedallovertheworldtoday.However,withtheattention
to toxicologicalstudies,thepotentialrisksofmanysyntheticazo
colorantstohumanhealtharefoundandconcerned