Geraniol is a crucial component in the leaves of palmarosa (Cymbopogon martini) and it has a wide range of biological properties and applications. A brand-new concept of hydrotrope-assisted extraction is proposed for the isolation of geraniol using different techniques such as microwave technology (MAHE), hydro distillation (HAHD), and ultrasound technology (UAHE) in this study. A solubility test was carried out between two different hydrotropes such as sodium salicylate and resorcinol to find out the better hydrotrope for the extraction. At 40% (w/v), sodium salicylate has higher solubility (3.74% (w/v)) than resorcinol. Response surface methodology (RSM) was performed for all techniques to optimize the process parameters by varying the volume of hydrotrope solution from 300 to 600 mL and extraction time from 5 to 25 min. A maximum yield of 2.47% (w/w) was obtained during the UAHE process under the optimized condition of 5 min sonication time, 600 mL volume of 0.42 M of sodium salicylate and 120 W ultrasound power. The geraniol content was identified by using gas chromatogram and found to be 0.31% in 10 mL of sample obtained from UAHE technique. Therefore, the ultrasound-assisted hydrotrope technique has highly recommended to sustainable development for large-scale application.

香叶醇是棕榈树叶中的重要成分（Cymbopogon martini)，具有广泛的生物学特性和应用。本研究提出了一种全新的水溶助剂辅助萃取概念，利用微波技术 (MAHE)、水力蒸馏 (HAHD) 和超声技术 (UAHE) 等不同技术分离香叶醇。在水杨酸钠和间苯二酚等两种不同的水溶助长剂之间进行了溶解度测试，以找出更适合提取的水溶助长剂。在 40% (w/v) 时，水杨酸钠的溶解度 (3.74% (w/v)) 高于间苯二酚。通过将水溶助长剂溶液的体积从 300 mL 更改为 600 mL，将提取时间从 5 分钟更改为 25 分钟，对所有技术执行响应面方法 (RSM) 以优化工艺参数。最大产量为 2。在 5 分钟超声处理时间、600 mL 体积的 0.42 M 水杨酸钠和 120 W 超声功率的优化条件下，UAHE 过程中获得了 47% (w/w)。气相色谱法鉴定了香叶醇的含量，UAHE 技术得到的 10 mL 样品中香叶醇的含量为 0.31%。因此，超声辅助水溶助长技术值得大规模应用，可持续发展。