EXTRACTION AND CHARACTERISATION OF DYE FROM ROSELLE HIBISCUS SABDARIFA

ABSTRACT

Roselle is a naturally occurring colourant, due to its high levels of Anthocyanin pigment, and it can be utilized as an antioxidant or natural colorant. This project seeks to investigate the identity of the dye obtained from Roselle (Hibiscus Sabbdariffa) by examining the influence of temperature, pH, light and time on its stability. The dry petals of Roselle were extracted using a liquid-solid extraction technique with water and ethanol as solvents. The UV-Vis spectroscopy study shows that the maximuinm wavelength of the water extracted dye is 618nm, with an absorbance of 3.481, and that of ethanol extracted dye showed a maximium wavelength of 664nm, with an absorbance of 0.514. According to the FTIR spectroscopy studies it shows the presense of O-H, C-H, C-N, and C-O. The results demonstrate that environmental variables such as temperature, pH level, light intensity, and time influence the color of the Roselle extract. Additionally, they demonstrate the presence of functional groups in the extract, as well as the presence of the dye in the visible area.