Department of Food Engineering and Technology, School of Engineering, Tezpur University, Napaam 784028, Assam, India.
Department of Food Science, College of Agriculture, University of Basrah, Basrah 61004, Iraq.
Molecules. 2020 Sep 7;25(18):4072. doi: 10.3390/molecules25184072.
Essential oils of sweet lime peel, a waste by-product in the juice industry, were extracted using the vacuum assisted solvent free microwave extraction (VASFME) method. The effects of microwave output power (500-1000 W) and extraction time (20-30 min) on the essential oils yield and antimicrobial property were investigated. Optimal conditions were observed at 797.844 W microwave output power and 30 min extraction time. The essential oils yield and antimicrobial property under these conditions were 0.792 ± 0.03% and 18.25 ± 1.45 mm, respectively, which agrees with the predicted values of 0.757% and 16.50 mm. The essential oils were extracted at optimized conditions and analyzed through GCMS for compound identification. A total of 49 compounds were identified, with limonene content (43.47%) being the highest among all sweet lime peel oil compounds. Moreover, the sweet lime peels were subjected to ultrasound pre-treatment before microwave extraction. The ultrasound pre-treatment helped to increase the essential oils yield from 0.84 to 1.06% as the treatment time increased from 30 to 90 min. The increase in yield was 37.66% more compared to VASFME at 90 min treatment time.
甜橙皮的精油是果汁工业的一种副产物，采用真空辅助无溶剂微波萃取（VASFME）法提取。考察了微波输出功率（500-1000 W）和萃取时间（20-30 min）对精油得率和抗菌性能的影响。在 797.844 W 微波输出功率和 30 min 萃取时间下观察到最佳条件。在此条件下，精油得率和抗菌性能分别为 0.792±0.03%和 18.25±1.45mm，与预测值 0.757%和 16.50mm 一致。在优化条件下提取精油，并通过 GCMS 进行化合物鉴定。共鉴定出 49 种化合物，其中柠檬烯含量（43.47%）最高。此外，在微波萃取前对甜橙皮进行了超声预处理。随着处理时间从 30 分钟增加到 90 分钟，超声预处理有助于将精油得率从 0.84%提高到 1.06%。与 90 分钟的 VASFME 相比，产量增加了 37.66%。
