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首页> 外文期刊>Journal of The Institution of Engineers (India), Series E. Chemical Engineering and Textile Engineering >Natural Dye Extracted from Vitex negundo as a Potential Alternative to Synthetic Dyes for Dyeing of Silk
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Natural Dye Extracted from Vitex negundo as a Potential Alternative to Synthetic Dyes for Dyeing of Silk

机译：从Vitex Negondo提取的天然染料作为丝绸染色的合成染料的潜在替代品

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摘要

Since the last decade, the application of natural dyes on textile material has been gaining popularity all over the world, possibly because of the increasing awareness of issues concerning the environment, ecology and pollution control. The present paper investigates extraction of natural dye from leaves of the plant Vitex negundo, which is an abundant, cheap, and readily available agricultural by-product. Water extracts from V. negundo was used to dye silk fabrics. Optimum extraction conditions included pH 9, duration 120 min, and temperature 90 °C. Optimum dyeing conditions included dyeing pH 5 and duration of 60 min. Potash alum, tannic and tartaric acid were used as mordants, all of which are benign to human health and the environment. Color strength and color coordinates in terms of L*, a*, b*, C, and h were examined. A range of shades were obtained when fabrics were dyed with different mordants and mordanting techniques. The extracted dye was tested for some of the eco-parameters using atomic absorption spectrophotometry and GC/MS. The test results were compared with set standards to determine the eco-friendliness of natural dye. Their concentrations were found to be lower than the stipulated limits. Dyed samples were tested for antimicrobial activity against gram-positive and gram-negative bacteria. The dyed silk fabrics showed acceptable fastness properties and were also found to possess antibacterial activity. It can be concluded that the abundantly available agricultural byproduct V. negundo has great potential to be effectively utilized as a natural dye for silk.
机译：自上年十年以来，在纺织材料上的应用在世界各地的受欢迎程度，可能是因为增加了对环境，生态和污染控制的问题的认识。本文研究了来自植物VITEX Negundo叶片的自然染料，这是一种丰富，便宜，易于提供的农业副产品。来自V. negundo的水提取物用于染色丝绸面料。最佳提取条件包括pH 9，持续时间120分钟和90℃。最佳染色条件包括染色pH5和60分钟的持续时间。钾盐矾，鞣制和酒石酸用作媒体，所有这些都是人类健康和环境的良性。检查L *，A *，B *，C和H方面的颜色强度和颜色坐标。当用不同的媒晶染色和逆势技术染色织物时，获得了一系列色调。使用原子吸收分光光度法和GC / MS对提取的染料测试一些生态参数。将测试结果与设定标准进行比较，以确定天然染料的生态友好性。发现它们的浓度低于规定的限制。测试染色样品以针对革兰氏阳性和革兰氏阴性细菌进行抗微生物活性。染色的丝绸织物显示出可接受的牢度特性，也发现具有抗菌活性。可以得出结论，丰富的农业副产品V. Negundo具有很大的潜力，可有效地用作丝绸的天然染料。

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