AN EXPERIMENTAL STUDY ON CONVENTIONAL AND ULTRASOUND-ASSISTED EXTRACTION OF HIBISCUS ANTHOCYANINS FOR ECO-DYEING OF COTTON SUBSTRATES

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 i...

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Bibliographic Details
Published inInternational Multidisciplinary Scientific GeoConference : SGEM Vol. 19; no. 6.1; pp. 523 - 533
Main Authors Perju, Mirabela, Coman, Diana, Oancea, Simona
Format Conference Proceeding
LanguageEnglish
Published Sofia Surveying Geology & Mining Ecology Management (SGEM) 01.01.2019
Subjects
Acidification
Acids
Anthocyanins
Antioxidants
Bioavailability
Chemistry
Color
Colour
Copper
Cotton
Cotton fabrics
Dyes
Ecological effects
Ethanol
Exhaustion
Food
Hibiscus sabdariffa
Mordant dyes
Nutrition research
Pharmaceuticals
Pigments
Polyphenols
Procedures
Roselle
Saturation
Saturation (color)
Solvent extraction
Solvents
Sonication
Substrates
Textiles
Ultrasonic imaging
Ultrasound
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Summary: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.
ISSN:1314-2704
DOI:10.5593/sgem2019/6.1/S25.068