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首页> 外文期刊>American journal of applied sciences >Effect of Temperature on the Color of Natural Dyes Extracted Using Pressurized Hot Water Extraction Method
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Effect of Temperature on the Color of Natural Dyes Extracted Using Pressurized Hot Water Extraction Method

机译：温度对加压热水萃取法提取天然染料颜色的影响

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Problem statement: Traditionally, extraction of natural dyes with boiling method produced only one single tone of colorant/dyes which involved plenty of water in several hours of extraction time. A new modern extraction technique should be introduced especially to textile dyers so that a variety of tone of colorants can be produced in a shorter time with less consumption of water. Approach: This study demonstrated Pressurized Hot Water Extraction (PHWE) as a new technique to extract colorants from a selected plant, i.e., Xylocarpus moluccensis species which can be found abundantly in Peninsular Malaysia. Colorant from the heartwood of Xylocarpus moluccensis was extracted at different elevated temperatures, from 50℃ up to 150℃ using PHWE technique and the extracts obtained were compared to those obtained via boiling method at 100℃. The color strength of dye extracts was then analyzed using-UV-Visible spectrophotometer and Video Spectral Comparator (VSC 5000). The effect of the extraction temperatures on the color of extracts obtained by PHWE was also investigated. Results: Results show that the colorimetric data obtained from VSC reading exhibited the exact tone of colors found in anthraquinone. UV-Visible spectrum also shows that higher absorbance of natural dyes extracted via PHWE compared to those obtained by boiling method. Conclusion: By using PHWE employed at different elevated temperatures, different tones of colorants can be produced from one single source in a shorter time with less consumption of water.
机译：问题陈述：传统上，用沸腾法提取天然染料只会产生一种色调的着色剂/染料，在数小时的提取时间内会消耗大量的水。应该将一种新的现代萃取技术特别引入到纺织品染色机中，以便可以在更短的时间内生产出多种色调的着色剂，并且消耗更少的水。方法：这项研究表明，加压热水提取（PHWE）是一种从选定植物中提取色素的新技术，该植物即在马来西亚半岛大量发现的木糖草（Xylocarpus moluccensis）。利用PHWE技术在50℃至150℃的不同高温下提取木果心材的着色剂，并将所得提取物与通过100℃煮沸法得到的提取物进行比较。然后使用紫外可见分光光度计和视频光谱比较仪（VSC 5000）分析染料提取物的色强度。还研究了提取温度对通过PHWE获得的提取物颜色的影响。结果：结果表明，从VSC读数获得的比色数据显示出蒽醌中所发现的确切色调。紫外可见光谱还显示，与通过沸腾方法获得的染料相比，通过PHWE提取的天然染料具有更高的吸收率。结论：通过在不同的高温下使用PHWE，可以在更短的时间内从一个单一的来源生产出不同色调的着色剂，并且耗水量更少。

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