Effect of Temperature on the Color of Natural Dyes Extracted Using Pressurized Hot Water Extraction Method
Nursyamirah Abd Razak, Siti Marsinah Tumin and Ruziyati Tajuddin
DOI : 10.3844/ajassp.2011.45.49
American Journal of Applied Sciences
Volume 8, Issue 1
Problem statement: Traditionally, extraction of natural dyes with boiling method produced only one single tone of colorant/dyes which involved plenty of water in several hours of extraction time. A new modern extraction technique should be introduced especially to textile dyers so that a variety of tone of colorants can be produced in a shorter time with less consumption of water. Approach: This study demonstrated Pressurized Hot Water Extraction (PHWE) as a new technique to extract colorants from a selected plant, i.e., Xylocarpus moluccensis species which can be found abundantly in Peninsular Malaysia. Colorant from the heartwood of Xylocarpus moluccensis was extracted at different elevated temperatures, from 50°C up to 150°C using PHWE technique and the extracts obtained were compared to those obtained via boiling method at 100°C. The color strength of dye extracts was then analyzed using UV-Visible spectrophotometer and Video Spectral Comparator (VSC 5000). The effect of the extraction temperatures on the color of extracts obtained by PHWE was also investigated. Results: Results show that the colorimetric data obtained from VSC reading exhibited the exact tone of colors found in anthraquinone. UV-Visible spectrum also shows that higher absorbance of natural dyes extracted via PHWE compared to those obtained by boiling method. Conclusion: By using PHWE employed at different elevated temperatures, different tones of colorants can be produced from one single source in a shorter time with less consumption of water.
© 2011 Nursyamirah Abd Razak, Siti Marsinah Tumin and Ruziyati Tajuddin. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.