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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (3): 108-114.doi: 10.3969/j.issn.0253-2417.2020.03.014

• 研究报告 • 上一篇    下一篇

超临界CO2萃取红麸杨果实中黄颜木素及其体外抗氧化活性研究

董爱文(),李维新,王欢,邹亚珂   

  1. 吉首大学 林产化工工程湖南省重点实验室, 湖南 张家界 427000
  • 收稿日期:2019-10-13 出版日期:2020-06-28 发布日期:2020-06-29
  • 作者简介:董爱文(1967-),男,湖南桃源人,教授,硕士生导师,主要从事资源植物的开发与利用; E-mail:daw1999@163.com
  • 基金资助:
    国家自然科学基金资助项目(31760084);张家界市科技局项目(2019FJ1129);大鲵资源保护与综合利用湖南省工程实验室开放课题(DNGC1701)

Extraction of Dihydrofisetin from Rhus punjabensis var. sinica Rehd. Fruit by Supercritical CO2 and Its Antioxidant Activity in vitro

Aiwen DONG(),Weixin LI,Huan WANG,Yake ZOU   

  1. Key Laboratory of Hunan Forest Products and Chemical Industry Engineering, Jishou University, Zhangjiajie 427000, China
  • Received:2019-10-13 Online:2020-06-28 Published:2020-06-29

摘要:

在超微粉碎机上将红麸杨果实于0~10℃条件下粉碎,并用石油醚(60~90℃)脱脂,然后采用超临界CO2萃取果粉中黄颜木素。研究了适宜的夹带剂,并通过正交试验优化超临界CO2萃取工艺条件,考察了所得黄颜木素的体外总抗氧化能力及其对DPPH·、超氧阴离子自由基(O2-·)与羟基自由基(·OH)的清除效果。结果显示:红麸杨果实经超微粉碎后粒径可达0.1~1 μm,细胞破壁率达95%以上,适宜的夹带剂为体积分数70%乙醇,萃取最佳条件为:果粉与夹带剂固液比5:3(g:mL)、萃取压力30 MPa、萃取温度55℃、萃取时间2 h、分离釜Ⅰ的温度55℃、压力10 MPa、分离釜Ⅱ的温度35℃、压力5 MPa,此条件下黄颜木素萃取物得率为0.46%,纯度为80.26%。该纯度黄颜木素具有较强的体外抗氧化活性,对DPPH·、O2-·和·OH的半数清除浓度(IC50)分别为6.93、59.63和9.05 mg/L;与同浓度的VC比较,对DPPH·和O2-·的清除率接近VC,而对·OH的清除能力和总抗氧化能力优于VC

关键词: 红麸杨果实, 黄颜木素, 超微粉碎, 超临界萃取, HPLC

Abstract:

Rhus punjabensis var. sinica Rehd. fruit was superfinely crushed at 0-10℃ and degreased with petroleum ether (60-90℃), and then the dihydrofisetin was extracted from fruit powder by supercritical CO2 extraction. The suitable entrainer was chosen, and the extraction conditions were optimized by orthogonal experiment. The total antioxidant capacity of the obtained dihydrofisetin and its scavenging effects on DPPH·, superoxide anion radicals (O2-·) and hydroxyl radicals (·OH) were investigated. The results showed that the particle size of R. punjabensis var. sinica fruit powder could be up to 0.1-1 μm after ultrafine-pulverization and cell-wall breaking ratio was over 95%; the suitable entrainer was ethanol with volume fraction of 70%, the optimal conditions for the extraction were solid-liquid ratio 5:3(g:mL), extraction pressure 30 MPa, extraction temperature 55℃, extraction time 2 h, separating axeⅠtemperature 55℃ and pressure 10 MPa, separating axeⅡtemperature 40℃ and pressure 5 MPa. Under these conditions, the yield of dihydrofisetin was 0.46%, the purity was 80.26%. The dihydrofisetin had strong antioxidant activity, and the half-clearance concentration(IC50) of DPPH·, O2-· and ·OH were 6.93, 59.63 and 9.05 mg/L, respectively. The radical scavenging abilities on DPPH· and O2-· were close to those of VC. The scavenging capacity of ·OH and total antioxidant capacity were better than those of VC.

Key words: Rhus punjabensis var. sinica Rehd. fruit, dihydrofisetin, ultrafine-pulverization, supercritical extraction, HPLC

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