Abstract
A new source of natural anthocyanins dyes, from Liriope platyphylla fruit, is proposed. This paper analyzes the dye extracts, the primary color components of the extracts, the color features of the extracts under different pH conditions, and their application in silk dyeing. The research shows that, nine anthocyanins are found in L. platyphylla fruits by analyzing the results of the HPLC/DAD, MS, and MS/MS spectra. The five major anthocyanins related to delphinidin, petunidin, and malvidin derivatives take up 91.72% of total anthocyanin contents. The color of the solution is red under acidic condition (pH < 3.0) and stays in yellow under alkaline condition with pH values above 7.0. The dye extracts applied to silk fabric with mordant free dyeing show different color under different pH conditions, changing between purple, blue, green, and yellow. However, the dyed colors is light and the dyeing rate is low. Metal mordant such as Sn in chelation enhances the dye depth and improves the fastness of the dyed silk fabrics, especially in silk fabrics dyed by premordanting and metamordanting.
Highlights
Natural dyes are generally environment friendly and have many advantages over synthetic dyes
The results show that the citric acid gives better yield and deeper color, which produce 29.8% and 15.0% more anthocyanins than 0.1% HCl and 0.5% Trifluoroacetic acid (TFA), respectively
The anthocyanin extracted from L. platyphylla fruits as a source of natural dyes has been utilized for the first time for silk fabrics dyeing to my best knowledge
Summary
Natural dyes are generally environment friendly and have many advantages over synthetic dyes. The applications of natural dyes are researched due to their biodegradability and higher compatibility with the environment [1,2,3] Anthocyanins, with their common structure shown, are flavonoids commonly found in flower petals, fruits, and leaves and produce orange, red, violet, and blue colours [4, 5]. Earlier studies show that anthocyanins are especially abundant in bilberry, strawberry, raspberry, grape skin, blackberry, and so on [6,7,8,9,10] Interests in these water-soluble pigments have been increased substantially during the last decade because of the increasing evidence demonstrating potential therapeutic effects. The color coordinates of the extracts and silk fabrics dyed by the extracts were analyzed with CIE1964-XYZ and CIE1976LAB of the Commission Internationale de L’Eclairage
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