• Bulletin of the Korean Chemical Society
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• 제32권7호
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• pp.2212-2216
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• 2011

An ionic liquid-based ultrasonic-assisted extraction method has been successfully applied to the effective extraction of phenolic compounds from Laminaria japonica Aresch. Three kinds of 1-alkyl-3-methyl-imidazolium with different cations and anions were evaluated for extraction efficiency. The results showed that both the characteristics of anions and cations have remarkable effects on the extraction efficiency. In addition, the ionic liquid-based ultrasonic-assisted extraction procedure was also optimized on some extraction parameters, such as ultrasonic power, extraction time and solid-liquid ratio. Compared with the conventional solvent, the optimum approach gained the highest extraction efficiency within the shortest extraction time. Average recoveries of phenolic compounds were from 75.5% to 88.3% at three concentration levels.

• Bulletin of the Korean Chemical Society
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• 제32권8호
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• pp.2637-2642
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• 2011

A new ultrasonic-assisted micellar extraction and cloud-point pre-concentration method was developed for the determination of major saikosaponins, namely saikosaponins -A, -C and -D, in Radix Bupleuri by high performance liquid chromatography with evaporative light scattering detection (HPLC-ELSD). The non-ionic surfactant Genapol X-080 (oligoethylene glycol monoalkyl ether) was chosen as the extraction additive and parameters affecting the extraction efficiency were optimized. The highest yield was obtained with 10% (w/v) Genapol X-080, a liquid/solid ratio of 200:1 (mL/g) and ultrasonic-assisted extraction for 40 min. In addition, the optimum cloud-point pre-concentration was reached with 10% sodium sulfate and equilibration at $60^{\circ}C$ for 30 min. Separation was achieved on an Ascentis Express C18 column (100 ${\times}$ 4.6 mm i.d., 2.7 ${\mu}M$) using a binary mobile phase composed of 0.1% acetic acid and acetonitrile. Saikosaponins were detected by ELSD, which was operated at a $50^{\circ}C$ drift tube temperature and 3.0 bar nebulizer gas ($N_2$) pressure. The water-based solvent modified with Genapol X-080 showed better extraction efficiency compared to that of the conventional solvent methanol. Recovery of saikosaponins ranged from 93.1 to 101.9%. An environmentally-friendly extraction method was successfully applied to extract and enrich major saikosaponins in Radix Bupleuri.

• Korean Chemical Engineering Research
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• 제52권4호
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• pp.481-485
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• 2014

잘피의 유용성분을 추출하기 위한 dipping, ultrasonic-assisted, heating추출법의 적용성을 검토하였다. 이온성 액체와 공융용매(DES)를 잘피에 존재하는 카페인산과 로즈마린산의 추출 효율을 증가시키기 위해 첨가제로써 사용하였다. 실험에서 확인된 최적의 조건은 동결건조된 0.005 g의 잘피 뿌리 파우더와 5 mL의 methanol 그리고 0.5 g의 DES-3를 바이알에 넣은 후 30분동안 dipping하여 추출하였다. 그 결과 0.19 mg/g 카페인산과 8.48 mg/g의 로즈마린산을 얻었다. 이 방법은 잘피에 있는 카페인산과 로즈마린산을 간단하고 성공적으로 적용할 수 있었고 전통적인 용매 추출법보다 청정용매인 DES를 첨가했을 때 잘피의 유용성분 추출에 더 적합함을 의미한다.