Effect of copper (ii) and chromium (vi) on crude extract of erythrina crysta-galli and ixora javanica flowers: spectrometric studies / Mazhamiza Ridzuan

Erythrina Crysta-Galli and Ixora Javanica flowers were chosen in these spectrometric studies. Extraction of natural pigments was performed in acidified water at different temperature (50 to 100°C). The crude extract was analyzed using ultraviolet visible spectrophotometer over the range of 400 nm to 650 nm. Maximum absorbance of Erythrina Crysta-Galli and Ixora Javanica crude extract was obtained at extraction temperature 100°C (1.246) at 511.08 nm and 60°C(1.214) at 513.10 nm respectively. The interaction of Cr(VI) and Cu(II) with crude extract at different concentration was studied. When the concentration of Cr(VI) increased, the absorbance of mixture increases. But, there are no changes in maximum absorbance when the concentration of Cu(II) increased. The maximum absorbance was shifted to shorter wavelength when Cr(VI) ion was added to crude extract of both flowers. When Cu(II) was added into the crude extract, hypsochromic shift was observed for Ixora Javanica and bathochromic shift for Erythrina CrystaGalli. The crude extract of natural pigment was also applied to silk fabric. Different shades of color on silk fabrics were obtained when the cation solution mixed with crude extract of each flowers.