Central Composite Design Approach for Optimization of Extraction and Dyeing Conditions of Marigold Colorant

Shaukat Ali,Sadia Noor

doi:10.4172/2329-6836.1000224

Abstract

Marigold flowers are used in many Asian countries for various occasions, rituals and offerings. A considerable amount of unused marigold flowers is wasted while the used ones also pose problems in disposing off. Central composite design of experiment was used to optimize the extraction and dyeing conditions of natural dye from marigold flowers. The effect of pH of the extraction medium, extraction time and material to liquor ratio was investigated. It was found that pH and liquor ratio had statistically significant effect on dye extraction, whereas the effect of time, within the range used in this study, was not found to be significant. Optimum dye extraction was obtained in acidic pH of the extraction medium at lower liquor ratio. Temperature and time dyeing are the most influential factors among many other parameters including amount of salt and material-to-liquor ratio. Cotton fabric dyed with the optimized dye extract, showed very good washing and light fastness properties but poor wet crocking fastness.

Highlights

Natural dyes have been in use since ancient times for coloring different substrates such as wool, cotton, silk and leather
It is believed that the use of natural dyes is a wiser and friendlier approach towards the environment as compared to the synthetic dyes
Natural dyes depend on a number of factors and pH of the extraction medium was found to be the most influential factor in the extraction of natural dye from marigold flowers

Summary

Introduction

Natural dyes have been in use since ancient times for coloring different substrates such as wool, cotton, silk and leather. There has been a wide range of use of these dyes as coloring content in cosmetic products, in printing inks, watercolors and in paints [1]. A recent revival in use of natural dyes in textile industries, has gained limelight all around the world. With increasing awareness of the issues of sustainability and environment protection, the use of synthetic dyes is being considered with caution. It is believed that the use of natural dyes is a wiser and friendlier approach towards the environment as compared to the synthetic dyes. Natural dyes are known to exhibit good level of biodegradability and a high environmental compatibility [2,3,4]

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Results

Conclusion