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 fabric before dyeing was performed to make cellulose susceptible to coloration with NP4 extract. Two combined pre-treatment steps were used, oxidation to obtain dialdehyde cellulose and chitosan deposition after oxidation. Chitosan was deposited onto untreated fabric as well, while only oxidized viscose was also investigated for dyeing. Functionalization by both protocols made viscose susceptible to dyeing with the notion that the deposition of chitosan onto oxidized viscose produced the darkest 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–pH 7) and a major color change from red to blue (pH 7–pH 10) whereby fabric was tested and could withstand 10 color-changing cycles. Cytotoxicity assay confirmed the non-toxic nature of dyed material, which indicates its possible use as wound dressing’s indicators.
Highlights
Halochromic materials can have a crucial role as sensors for various purposes, in healthcare or fitness industries, or even serve as a sensor for acid rain (Van der Schueren and de Clerck 2012a, b; Van Der Schueren et al 2012; Cao et al 2018; Promphet et al 2019; Stojkoski and Kert 2020)
Halochromic material was obtained by dyeing functionalized viscose fabric with a crude extract from Streptomyces sp. strain NP4
Viscose surface morphology was investigated with scanning electron microscopy (SEM) using a JEOL 840A instrument
Summary
Halochromic materials can have a crucial role as sensors for various purposes, in healthcare or fitness industries, or even serve as a sensor for acid rain (Van der Schueren and de Clerck 2012a, b; Van Der Schueren et al 2012; Cao et al 2018; Promphet et al 2019; Stojkoski and Kert 2020). The most common challenges of application of pH-sensitive dyes to textile materials are the proper compatibility of dye-fiber system and the appropriate range of pH sensitivity for targeted application (Van der Schueren and de Clerck 2011; Sun et al 2015; Pakolpakcil et al 2018). A dressing with pH sensor which will indicate infection/healing of wounds is highly sought after. Cellulose and chitosan (CS), as abundant, natural, biocompatible, and nontoxic biopolymers, emerge as leading materials for the healthcare and medical textile industry (Kalia and Averous 2011; Cédric 2017). The use of natural polymers in healthcare is important not just from the aspect of biocompatibility, biodegradability, and general health safety, and from the aspects of the negative environment impact decrease from (over)usage of synthetic polymers. The use of natural, instead of synthetic dyes, especially for biopolymers dyeing (Bechtold et al 2003), is added value toward the development of all-natural products
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