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RESEARCH ON APPLICATION OF BILBERRY EXTRACT IN NATURAL TEXTILE DYEING TECHNOLOGY

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Author(s): Diana Coman | Simona Oancea | Narcisa Vrînceanu

Journal: Annals of the University of Oradea. Fascicle of Textiles, Leatherwork
ISSN 1843-813X

Volume: XIV;
Issue: 1;
Start page: 152;
Date: 2013;
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Keywords: linen fabrics | anthocyanins | ultrasonication | inclusion complex | fastness testing

ABSTRACT
Because most of the natural dyes show positive effect as eco-safe products both for humans and environment, the present study deals with the investigation regarding the application of natural extracts in textile dyeing processes. Thus, anthocyanins which are water soluble pigments widely distributed in fruits, were the central point of this research which focused on a hydroethanolic anthocyanin extract obtained from bilberry (Vaccinium myrtillus L.). Their behavior and the opportunity of their application onto textile materials dyeing were investigated. The study relies on the improvement of multifunctionalities such as colour fastness by using the ability of hydrophobic MCT- β-CD’s cavity to form inclusion complexes with dyes based on their selectivity. Ultrasounds dyeing with the obtained anthocyanin extract were carried out and results were compared to the standard technology. Concerning the experimental methodology, the study points out firstly a preliminary improvement of the linen substrate carried out using monochlorotriazinyl-β-cyclodextrin (MCT-β-CD). Secondly, bilberry anthocyanin extract was applied on linen material, by both exhaustion and ultrasonic dyeing procedures. The characterization of the morphology, structural and fastness properties of dyed materials was performed, by using an investigation system consisting of: scanning electron microscopy SEM, FT-IR spectroscopy, BET Surface Area Analysis, as well as dyeing fastness. The results of analysis revealed an eveness of samples, in terms of coloring by ultrasounds dyeing method. Moreover, improvements of washing and rubbing fastness were achieved (0.5-1 pints).
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