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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27827

    標題: Development/optimization of a green procedure with ultrasound-assisted improved supercritical carbon dioxide to produce extracts enriched in oleanolic acid and ursolic acid from Scutellaria barbata D. Don
    作者: Yang, Yu-Chiao
    Wei, Ming-Chi
    Hong, Show-Jen
    Huang, Ting-Chia
    Lee, Suen-Zone
    貢獻者: 環境工程與科學系
    關鍵字: Scutellaria Barbata D. Don
    Oleanolic Acid
    Ursolic Acid
    Ultrasound-Assisted Extraction
    Supercritical Carbon Dioxide Extraction
    日期: 2013-08
    上傳時間: 2014-05-26 10:45:17 (UTC+8)
    出版者: Elsevier Science Bv
    摘要: In the present study, the evaluation of oleanolic acid (OA) and ursolic acid (UA) from Scutellaria barbata D. Don was carried out using either an ultrasound-assisted supercritical carbon dioxide (UA-SC-CO2) extraction process or a heat reflux extraction (HRE) process. The influence of different variables was investigated to evaluate their influence on the yield. A reverse-phase HPLC system coupled with a UV detector was also used to quantify the levels of OA and UA in the extracts obtained using these two techniques. The optimum conditions for UA-SC-CO2 extraction from S. barbata D. Don were as follows: mean particle size of 0.355 mm, pressure of 27.6 MPa, temperature of 55 degrees C, CO2 flow rate of 2.1 mL/min (SIP) and 14.1% (v/v) aqueous ethanol (ethanol/water = 80/20, v/v) as modifier (co-solvent) for a 50 min extraction time. With these conditions, the yield of OA was 14.142 +/- 0.583 mu g/g of dry plant and the yield of UA was 59.275 +/- 2.414 mu g/g of dry plant. This result was comparable to that obtained from HRE in 80-90% ethanol at 75 degrees C for 180 min (3 extraction cycles). The experimental results show that UA-SC-CO2 extraction saves time and energy and uses much less organic solvent. Therefore, we can conclude that UA-SC-CO2 extraction is technically feasible for the extraction of OA and UA from S. barbata D. Don. (C) 2013 Elsevier B.V. All rights reserved.
    關聯: Industrial Crops And Products, v.49 n. pp.542-553
    Appears in Collections:[環境工程與科學系(所)] 期刊論文

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