1. Ionic liquids-based microwave-assisted extraction of active components from pigeon pea leaves for quantitative analysis
- Author
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Wei, Zuofu, Zu, Yuangang, Fu, Yujie, Wang, Wei, Luo, Meng, Zhao, Chunjian, and Pan, Youzhi
- Subjects
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IONIC liquids , *EXTRACTION (Chemistry) , *PIGEON pea , *QUANTITATIVE chemical analysis , *IMIDAZOLES , *IRRADIATION , *COMPOSITION of leaves - Abstract
Abstract: The present study aims to extract active components from pigeon pea leaves by ionic liquid-based microwave-assisted extraction (ILMAE) for quantitative analysis. Compared with ionic liquid-based heating extraction (ILHE) and ultrasonic-assisted extraction (ILUAE), ILMAE exhibited higher extraction efficiency. A series of 1-alkyl-3-methylimidazolium ILs with different anions and alkyl chain lengths of cations were investigated, and 1-butyl-3-methylimidazolium bromide ([C4MIM]Br) solution was selected as extractants. Subsequently, ILMAE parameters were optimized, and the optimized conditions were [C4MIM]Br concentration 0.75M, extraction temperature 60°C, solvent to solid ratio 12:1mL/g, and irradiation time 7min. Under the optimal conditions, the extraction efficiency increased by 11.0–38.9% compared with ILHR and ILUAE, and the recovery achieved more than 95.3%. Furthermore, a rapid analysis method, HPLC-DAD with an UPLC column, was established and validated. This method exhibited satisfactory linearity (r 2 >0.999), precision (RSD<4.6%) and recovery (97.14–103.38%), and was successfully applied for the quantification of nine components in pigeon pea leaves within 25min. The results obtained provide a fast and safe method for determination of active components in pigeon pea leaves. [Copyright &y& Elsevier]
- Published
- 2013
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