Extração do corante da beterraba (Beta vulgaris) como alternativa sustentável aos corantes sintéticos em cosméticos

Abstract

The present study evaluated the viability of the natural dye extracted from beetroot (Beta vulgaris) as a sustainable alternative to synthetic dyes in cosmetic formulations. The betalain pigment was obtained through maceration in a hydroalcoholic solution and subsequently concentrated by rotary evaporation, a process that minimized thermal degradation. The extract was incorporated into a biphasic lip balm formulation developed with natural ingredients and subjected to pH analysis, visual and organoleptic evaluation, and accelerated stability tests, including direct exposure to sunlight. The formulation showed good physical stability, with no phase separation or syneresis. However, significant photodegradation of the pigment and lipid oxidation were observed under solar exposure, resulting in changes in color (to dark orange-brown) and the development of rancid odor, as well as slight softening of the matrix. The results indicate that although the concentrated extract demonstrates potential for cosmetic application, its stability depends on additional strategies, such as the use of more effective antioxidants and light-barrier packaging. Thus, betalain proves to be a promising natural alternative, provided it is associated with protection systems that ensure its durability and performance in lipid-based formulations.