Traditionally, extraction of natural dyes with aqueous extraction method involve several hours of extraction time. A rapid and improved extraction technique should be introduced especially to textile dyers for synthesis of natural dyes in a shorter time. This study demonstrates the microwave irradiation as a new technique to extract colorants from a selected flower, i.e. butterfly pea which can be found abundantly in India. Colorant from this flower is extracted at different elevated times, from 10 sec up to 2 min using microwave technique and the extracts obtained are compared to those obtained by aqueous extraction method at 30 min to 3 h. The color strength and yield of dye extracts is analyzed using UV-Visible spectrophotometer. It is observed from the experimental results that the extraction using microwave techniques gives better results than the conventional aqueous extraction methods.
Keka Sinha, Papita Das Saha, V. Ramya and Siddhartha Datta, 2012. Improved Extraction of Natural Blue dye from Butterfly Pea using Microwave Assisted Methodology to Reduce the Effect of Synthetic Blue Dye. International Journal of Chemical Technology, 4: 57-65.