Effects of Alkalis on Sedimentation and pH of the Colored Water Extracted from Water Jasmine Leaves

  • Sarayut Jai-ngamdee Faculty of Agriculture Kasetsart University Bangkok
  • Sarunya Puakpong Faculty of Science, Kasetsart University Bangkok
  • Wallop Arirop Faculty of Textile and Fashion Design Rajamangala University of Technology Phra Nakhon
  • Rattanaphol Mongkholrattanasit Faculty of Textile and Fashion Design Rajamangala University of Technology Phra Nakhon
  • Apichart Sonthisombat Faculty of Engineering, Rajamangala University of Technology, Thanyaburi
Keywords: Natural Color Extraction, Natural Blue Color, Water Jasmine, pH Value


This research aimed to study the effect of alkaline type on the precipitation of color extracted from Water Jasmine leaves by using cold extraction method. The ratio of Water Jasmine leaves: water was 1:5 (weight/volume, w/v), soaked at room temperature for 72 hours. The results were found that the color of extracted solution from Water Jasmine leaves was green-blue color and the pH value was 4.8. The wavelength of maximum absorbance (λmax) was 510 nanometer. The color of The three different kind of alkaline substances: red lime, lime and sodium carbonate were added in the extracted solution at a ratio of alkaline agent: Water jasmine extracted solution was 1:10 (w / v) then stir the solution together with the extracted solution from the Water Jasmine leaves. Leave it at room temperature for 24 hours for the solution to be precipitated. Weigh the resulting sludge and measure the pH value. It was found that different type of alkaline substances had signifi cantly different effect on 0.05. The formation of colored sludge and pH value of solution extracted from the Water Jasmine leaves, characteristic and weight of sludge obtained from different alkaline substances. The sludge of red lime looks like a dark blue mud. Lime sediments are characterized by a bluish sandy texture. The sediment weight was 61.3 and 25.3 grams, and sodium carbonate had no precipitation formed, but the colored solution was darker. The results of the three different kind of alkaline substances on solution extracted from the Water Jasmine leaves were found that the addition of red lime had the highest pH, followed by sodium carbonate and lime with a pH of 11.5, 9.8 and 5.4 respectively.


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