Extraction of an eco-friendly natural dye from Eleutherine bulbosa (Miller) Urban bulbs, its application as a cotton fabric colorant and chemical characterization

ABSTRACT

In recent years, natural dyes are gaining importance in textile dyeing applications as they are renewable and biodegradable. In the present study, we selected Eleutherine bulbosa bulbs as a source of natural colorant for dyeing cotton fabrics. Water was used for the extraction of dye, a step toward eco-friendly dyeing. The dyeing was carried out with different mordants and color fastness properties were determined. Relatively higher color strength values were obtained with Myrobalan fruit extract (Mfe- 4.267) and Pomegranate rind extract (Pre- 2.731) as mordants. With Mfe and Pre good color strength values were retained even after detergent wash (3.103 and 1.865) or light exposure (3.689 and 2.395). A combination of Eleutherine dye with turmeric extract was also experimented. Results showed better color strength values with Mfe (4.304) and Pre (3.120). The color retainability after detergent wash (2.960 and 2.100) or light exposure (4.186 and 2.911) was also good with these mordants. Results revealed that E. bulbosa could be used as a source of an ecofriendly dye for cotton fabrics, and the dye-fixing is most effective with the natural mordant myrobalan. The composition of dye extract was analyzed by LCMS technique, 15 compounds were detected, most of which are quinone derivatives.

摘要

近年来, 天然染料由于可再生和可生物降解, 在纺织染色应用中越来越重要. 在本研究中, 我们选择了紫檀球茎作为棉织物染色的天然着色剂来源. 水被用来提取染料, 这是迈向环保染色的一步. 用不同的媒染剂进行染色, 并测定其色牢度. 用桃金娘果实提取物 (Mfe-4.267) 和石榴皮提取物 (Pre-2.731) 作为媒染剂获得了相对较高的颜色强度值. 即使在洗涤剂清洗 (3.103和1.865) 或光照 (3.689和2.395) 后, Mfe和预处理颜色强度值仍保持不变. 还试验了将榄香素染料与姜黄提取物相结合. 结果表明, Mfe (4.304) 和Pre (3.120) 具有更好的颜色强度值. 这些媒染剂在洗涤剂洗涤 (2.960和2.100) 或光照 (4.186和2.911) 后的颜色保持性也很好. 结果表明, 球茎E.bulbosa可作为棉织物的一种环保染料来源, 而天然媒染剂myrobalan的固色效果最好. 采用LCMS技术分析了染料提取物的组成, 检测到15种化合物, 其中大部分为醌类化合物.

KEYWORDS:

• Eleutherine bulbosa
• natural dye
• mordant
• color strength
• eco-friendly

关键词:

• 天然染料
• 媒染剂
• 颜色强度
• 环保

Disclosure statement

No potential conflict of interest was reported by the authors.

Highlights

• Bulb of Eleutherine bulbosa is a novel source of natural dye for cotton fabrics.

• Water is used as the solvent for the extraction of dye as well as the mordant extracts, which makes it a completely eco-friendly dye.

• The spectrum of colors could be enhanced by mixing with another natural dye extracted from Turmeric.

• Better color fastness was obtained with a natural mordant, myrobalan fruit extract.

• LCMS analysis showed that the predominant compounds in the Eleutherine dye extract are quinone derivatives.

Additional information

Funding

The corresponding author received research fellowship [File No. 09/102(0243)/2016-EMR-1] from Council of Scientific and Industrial Research (CSIR).