Abstract

• In this research work, the raw sample barks (Ka-bwee) were collected from Sittwe, Rakhine State. Physicochemical parameters of Ka-bwee raw bark powder such as moisture content, ash content, bulk density and pH were determined. Natural dyes were extracted from the bark of Ka-bwee by different solvents (water, ethanol and methanol).The prepared natural dyes were characterized by FT IR, EDXRF and UV-visible techniques. Relative abundances of elements in prepared natural dyes were analyzed by EDXRF which showed the chemical constituents of the elements. According to the FT IR, in Ka-bwee dyes extracted by different solvents, functional groups of O-H stretching, C=C, C-O (stretching) and benzene ring were observed. The phytochemical tests of dyes extracted with water were carried out. In phytochemical test, tannins, flavonoids, α-amino acids and others were observed in the dye solutions. Furthermore, antimicrobial activities of Ka-bwee dyes were investigated by agar disc diffusion method on six tested organisms. The wavelengths of maximum absorption (λmax) of Ka-bwee dyes extracted with water, ethanol and methanol were observed at 510, 494 and 499 nm respectively. Sorption properties of 1000 ppm natural dye solutions dyeing on cotton were studied at different temperatures (40-90°C) by using UV-visible spectrophotometer. From the experiment, the optimum temperature of Ka- ee d es e t a ted it ate , et anol and et anol e e at C. The optimal conditions of dyeing on cotton cloth were observed at concentration of dye solution (1000 ppm), mordant alum dosage 0.1 g, contact time 60 min and pH 6. The dye solutions were prepared by natural dye powder with water. After dyeing on cotton cloth, the poor wash and light fastness of dyed fabrics improved with mordanting. The colour intensities of these dyed cotton were determined by Reflection Transmission Colour Densitometer. Depending on the type of mordant, such as alum, onion peel, teawaste and jengkol peel (natural mordant), colour fastness of the dyeing cotton cloth were studied.