Abstract
Betalains are of great taxonomic significance in higher plants and occur only in 10 families of the order Caryophyllales (Centrospermae). They are water-soluble nitrogenous pigments. They can be divided into two major structural groups, the red to red-violet betacyanins and the yellow betaxanthins. Betalains are widely used as natural red food colorant as well as antioxidant potentials. Several methods have been published for the determination of betalain in fruits of Opuntia species. The purpose of the current review is to provide a systematic survey of the analytical techniques for the determination of betalain from fruits of Opuntia species.
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