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AN EXPERIMENTAL STUDY ON CONVENTIONAL AND ULTRASOUND-ASSISTED EXTRACTION OF HIBISCUS ANTHOCYANINS FOR ECO-DYEING OF COTTON SUBSTRATES
Abstract
Natural dyes gained considerable attractiveness in textile manufacturing based on the negative impact of synthetic dyes on the environment and human health. The aim of the present study was to develop an efficient extractive technology of anthocyanins from Hibiscus sabdariffa, and to comparatively investigate the dyeing of cotton with the natural extract, in the presence and absence of (bio)mordants. The results of extraction processes using eco-friendly solvents and different solvent/solid ratio and extraction time showed improved anthocyanins recovery in acidified ethanol under ultrasound-assisted conditions. Dyeing the cotton fabrics samples with Hibiscus extract was performed by exhaustion and sonication procedures. The dyed samples were characterized by ATR-FTIR analysis. The results of color coordinates determined by CIELAB measurement system showed improved dyeing in presence of biomordants such as citric and tannic acids, being comparable to those on dyeing using the standard copper sulphate. The results of our work revealed the potential of ecological dyeing of cellulosic substrates with Hibiscus sabdariffa anthocyanins extract as well as differences of color, hue and saturation due to different dyeing methods and (bio)mordants applied.
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