Spectrophotometric investigation of natural dyes of Portulaca grandiflora and Catharanthus roseus flowers

Abstract

The study of dyes of native flowers contributes to a better investigation of these species, which can motivate new economic activities in the country. The objective of this work was to characterize by spectrophotometry the natural dyes extracted from the petals of the flowers Portulaca grandiflora and Catharanthus roseus. The extraction of the dyes was carried out by maceration of the petals of the dried flowers and under different experimental conditions to evaluate the extraction time and the type of solvent used. The dyes obtained were characterized by spectrophotometry in the UV/Visible region to evaluate the spectroscopic behavior and the maximum absorbance lengths of each flower. The extractions of the dyes from the flowers were effective in the experimental conditions evaluated, but with spectroscopic profiles showing bands in different regions and with varying intensities. The study of the spectrophotometric behavior of these flowers can help in their use as an alternative source of natural dyes.

DOI:https://doi.org/10.56238/sevened2024.014-023