EXTRACTION OF NATURAL DYES FROM FUNGUS – AN ALTERNATE FORTEXTILE DYEING

Ms. Tehmina Pathan, Dr. Falguni Patel

Abstract


There is a growing interest in the revival of natural dyes in textile coloration. The prominence of natural dyes slacked down because synthetic dyes had some advantages over natural dyes like colour fastness, good reproduction of shades, brilliance of colours and easy to use and also for ready availability of pure synthetic dyes of different types/ classes and its cost advantages, most of textile dyers/ manufacturers shifted toward use of synthetic colourant. Apart from being used in textile industry, natural dyes are now days used in cosmetics, leather, food and pharmaceutical industry.  Microbial dyes have some advantages over plant and animal based dyes as microbes are fast growing and have the potential of being standardized commercially. Microbial dyestuffs produce rare colour ideas and are automatically harmonizing. Unlike, non-renewable basic raw materials for synthetic dyes, these natural dyes are usually renewable and biodegradable and generally have a higher compatibility with the environment than synthetic dye therefore, no disposal problem of this natural waste.Theproduction and evaluation of microbial pigments as textile colorants is currently being investigatedby the BritishTextile Technology Group (BTTG).Present study has been made to explore the microbial world as potential textile dyes. The different type of growth media those are used in microbiology. Inoculate different pigment giving microbes and extract dye for dyeing textile. After dyeing spectrophotometer evaluation of the samples was done and wash fastness analysis was undertaken.The main objectives of study was to explore the microbial world as potential source of natural dyes.To assess the isolated strains for chromophoric microbes for their suitability as a textile dye.To study the fastness properties of the dyed textile material against various agencies of wear. To fulfil these objectives the study was designed in two phases i.e. Phase 1, and Phase 2, where the Phase 1 was dealing in exploration for microbes isolates showing chromo genesis. Phase 2 was optimization of the dyeing parameter and assessment of the final dyed samples. The experimental research design was conducted for flow of work.In the study total 63 NA and PDA plates were exposed to soil, air, food for obtaining unknown pigment producing microbes. Four known culture also used.22 microbes strains were found to produce pigment on NA and PDA plates.The extracted pigment from the screened 5 microbes strains was checked for its dyeability by dyeing with mordanted and unmordanted multi-fibre fabric.The 5 species were screened from soil, MTCC and food.The dye extracted could colour only wool, silk and acrylic in all cases. Cotton samples did not dye even with the use of mordants.Optimization of dyeing variables in order to time, temperature, M:L ratio, method of dyeing.It was found that Fusarium solani gave best results on mordanted wool and silk. The percentage exhaustion of wool is more than silk sample. The percentage exhaustion of Fusarium solani is 36% for wool and -79% for silk respectively. Samples were also visually examined and found to have darker shade on wool than silk.From colour values of final dyed samples, it was concluded that wool has higher K/S and lower L* value than silk, hence wool has higher colour depth than silk.


Keywords


hazards,adorning,stuff for dyeing

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References


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