International Journal of Chemical Technology

摘要

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.