Some characteristics of purpurin-18synthesised from chlorophyll a of Spirulina

Research and synthesis of photosensitive purpurin 18 (Pp-18) from nature is one of the topics that many research groups are interested in and developing. In this study, the authors defined some characteristics of Pp-18 synthesised from chlorophyll a - a substance isolated from Spirulina. The results showed that Pp-18 had good dispersion in acetone at 478.5 nm (R2=0.98285) and reached 98%. Fluorescence spectroscopy of Pp-18 in acetone was measured at a concentration of 70 ppm, wavelengths 365.39, 417.62, and 557.96 nm. The fluorescence lifetime of Pp-18 in acetone solution was 2.85 ns.

EXTRACTION OF NATURAL DYE FROM DIOSPYROS MOLLIS (GRIFF.) FRUITS BY MANY DIFFERENT SOLVENTS AND APPLICATION OF DYED ON SILK FABRIC

Diospyros mollis (Griff.) locally known as “mac nua”, is a kind of wild plant which fruits are used to dye the famous black “Lanh My A” silk of Tan Chau, An Giang. In this study, the author uses four solvents: water, ethanol, acetone and diethyl ether to extract natural dye and it’s used dyeing for silk. As a result, the natural dye extracted with acetone solution from Diospyros mollis (Griff.) fruits was used to dye for silk that obtained a color saturation 3.72 which was the best solvent. Silk fabric after dyeing has achieved the level of 4-5 color fastness, high mechanical strength and the ecological properties.