Halochromic cellulose textile obtained via dyeing with biocolorant isolated from Streptomyces sp. strain NP4

Abstract

Halochromic (pH-responsive) material was obtained by dyeing functionalized viscose fabric with a crude extract from Streptomyces sp. strain NP4. The functionalization of the pristine fabric before dyeing was performed to make cellulose susceptible to coloration with NP4 extract. Two combined pre-treatment protocols were used, oxidation to obtain dialdehyde cellulose and chitosan deposition onto pristine and oxidized cellulose. Functionalization by both protocols made viscose susceptible to dyeing with the notion that the latter deposition of chitosan produced a darker shade on the material. Dyed fabrics showed visual pH responsiveness in the range pH 4-10, with a color change from pink to red (pH 4 to pH 7) and a major color change from red to blue (pH 7 to pH 10) whereby fabric was tested and could withstand 10 color-changing cycles. Cytotoxicity assay con rmed the non-toxic nature of dyed material, which indicates its possible use as wound dressing's indicators.

Screen Printing of pH-Responsive Dye to Textile

“…Incorporation of pH-indicator dyes of different concentrations into polymer PA 6.6 solution during the electrospinning process does not change electrospinning parameters and the average fibre diameter does not significantly modify [18]. Incorporation of pHindicator dyes into polymer PA6 solution does not affect the morphology of nanofibers or the halochromic behaviour of dyes [15]. The effect of pH on fibre morphology was noticed only at pH < 1, where PA6 fibre disintegrates and release dye components into solution.…”

“…Current studies have mentioned several methods of application of pH-responsive dyes to textiles, namely conventional dyeing [5,6,[10][11][12][13][14][15], spraying [16], direct incorporation of the dye during electrospinning [7,12,17,18], coating [19,20], and sol-gel technology [8,12,21], but only one study mentioned conventional printing [22]. Halochromic behaviour of pH-responsive dye is in close correlation to dye structure [10,12], presence of different substituents in dye molecule [6], fibre composition [11,12], type of dye-fibre interactions [12], fabric density [10], and application methods [12].…”

Active Cellulose Acetate/Chitosan Composite Films Prepared Using Solution Blow Spinning: Structure and Electrokinetic Properties

“…Specifically, the peaks at 1654 cm −1 , 1590 cm −1 , and 1560 cm −1 are assigned to amide I, N-H bending vibrations of amide II, and stretching vibrations of amino groups, respectively [49,55]. These peaks correspond to the area for which chitosancellulose interactions have been reported [56,57]. However, due to the differences between cellulose and cellulose acetate, these interactions are probably less pronounced.…”

“…tosan-cellulose interactions have been reported [56,57]. However, due to the differences between cellulose and cellulose acetate, these interactions are probably less pronounced.…”

Formation of pH-Responsive Cotton by the Adsorption of Methyl Orange Dye

“…Halochromic dyes could be applied to textiles by conventional dyeing [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 12 , 13 , 14 , 15 , 16 ] and conventional printing [ 17 , 18 ], spraying [ 19 ], coating [ 17 , 18 ], sol-gel technology [ 5 , 6 , 7 , 20 ], during electrospinning [ 6 , 8 , 21 , 22 , 23 ] or immobilised onto the fabric channel using tetraoctylammonium bromide [ 24 ]. Among these, conventional exhaust dyeing is the most commonly used process, which does not require any change in dyeing equipment but only recommends the use of an appropriate choice of goods-to-liquor ratio (LR), the addition of chemicals, dye concentration, pH, dyeing time and temperature, and possible use of a suitable after-treatment process.…”