The current study deals with the extraction of natural dyes from the flower of the Sweitenia mahagoni plant by ultrasound-assisted extraction method using ethanol as solvent. Box-Behnken design has been employed to optimize and investigate the effect of three independent variables (sample-solvent ratio, sonication time and extraction temperature) on the natural dye yield. The results reveal that the experimental data are fitted to a second-order polynomial equation using multiple regression analysis with high coefficient of determination value (R²> 0.98, Adj. R² >0.96 & Pred. R² >0.81). Optimal extraction conditions for the dyes yield are: sample-solvent ratio 1/20 g/mL, sonication time 30 min and extraction temperature 50°C. Under these conditions, the highest dyes yield is predicted to be 0.855%. FTIR spectroscopy has been used to identify the major chemical group in the extracted dye. Further, dyeing of silk fabric has been carried out by an exhausted dyeing method and the dyeing property and fastness properties of the dyed samples are also assessed.

中文翻译：

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超声波辅助提取大花木中的天然染料及其在真丝织物上的应用

目前的研究涉及以乙醇为溶剂，通过超声辅助提取方法从马氏agon花（Sweitenia mahagoni）植物的花中提取天然染料。Box-Behnken设计已用于优化和研究三个独立变量（样品-溶剂比，超声处理时间和提取温度）对天然染料收率的影响。结果表明，使用具有较高确定值系数（R ^2）的多元回归分析，将实验数据拟合到二阶多项式方程。> 0.98，调整后 R²> 0.96和预测 R 2> 0.81）。染料产量的最佳提取条件为：样品与溶剂的比例为1/20 g / mL，超声处理时间为30分钟，提取温度为50°C。在这些条件下，最高的染料收率预计为0.855％。FTIR光谱已用于鉴定提取染料中的主要化学基团。此外，已经用尽力的染色方法对丝织物进行染色，并且还评估了染色样品的染色性能和坚牢度。