Extraction of Dyes from Sunflower Petal and Their Fourier Transform Infrared Characterization

摘要

Three solvents of different polarities(water,methanol and 1%NaOH solution)were used to extract dyes that produced different shades from dried sunflower(Helianthus annuus)petal.The extraction procedures using different solvent types were carried out separately.The dye extracts were thereafter subjected to Fourier Transform Infrared Spectrometry(FT-IR)analysis for characterization in terms of functional groups.The intensities of the extracted dyes on the shade of colours obtained on pieces of cotton material varied from yellow in methanolic extract to light yellow in aqueous and black in 1%NaOH solution extracts.The results obtained from the FT-IR analysis revealed the presence of several useful functional groups such as N-H,C=H,O-H and C=O in the extracts.