Isolation and characterization of flexirubin type pigment from Chryseobacterium sp. UTM-3T

The pigment from Chryseobacterium sp. UTM-3T was isolated and characterized with the aim to develop a natural colorant for application in bio-pigment production. The pigment was characterized by UV-Vis, FTIR, NMR and LC-MS which confirms that it belongs to flexirubin type of pigment. The physical and chemical properties revealed that the pigment has similar properties as most of natural pigment. It was insoluble in water and most organic solvents, but soluble only in acetone and alkaline aqueous and DMSO. The pigment was stable in UV, sunlight and in dark conditions, stable in the range of 25-100 °C. L⁎, a⁎ and b⁎ values of the CIELAB color system for the pigments were measured and hue, chroma were then calculated. The color of the pigment was in the range of yellow. This is the first report on the characterization of pigment from Chryseobacterium sp.