摘要:以桂花(Osmanthus fragrans Lour.)為原料,利用超聲波輔助提取桂花中的總黃酮類成分。重點考察了乙醇體積分數、超聲波功率、超聲波提取溫度、超聲波提取時間和液料比等因素對總黃酮提取率的影響。結果表明,桂花總黃酮的最佳提取工藝為乙醇體積分數60%,超聲波功率120 W,超聲波提取溫度50 ℃,液料比30∶1,超聲波提取時間35 min,采用該最佳提取工藝,總黃酮的提取率可達12.75%。桂花黃酮抗油脂過氧化能力強,在相同條件下抗油脂氧化的效果優于VC。
關鍵詞:桂花(Osmanthus fragrans Lour.);超聲波輔助提取;總黃酮;抗氧化活性
中圖分類號:R284.2 文獻標識碼:A 文章編號:0439-8114(2013)20-5023-03
Microwave-assisted Extraction and Anti-lipid Peroxidation Activity of Total Flavonoids from Osmanthus Fragrans Lour.
CHEN Pei-Zhen,LIN Zhi-Luan,SU Li-Man
(Wuyi College /Key Laboratory of Green Chemical Industry Technology of Fujian Province,Wuyishan 354300,Fujian,China)
Abstract: The extraction of flavonoids from sweet-scented osmanthu’s flavor with ultrasonic wave was studied. The influence of several parameters including ethanol concentration, ultrasonic power, ultrasonic extracted temperature, ultrasonic extracted time, and extraction/material solution ratio etc on the extraction rate of total flavonoids were investigated. The optimal extraction conditions were as follows: ethanol concentration 60%, ultrasonic power 120 W, ultrasonic extracted temperature 60 ℃, extraction/material solution ratio 30∶1 and ultrasonic extracted time 35 min. Under the optimal conditions, the total flavonoids yielded was 12.75%. Osmanthus flavonoids increase antioxidative ability and its antioxidative effect is stronger than that of VC under the same conditions.
Key words: Osmanthus fragrans Lour.; ultrasonicwave assisted extraction; total flavonoids
桂花(Osmanthus fragrans Lour.)為木樨科木樨屬植物,別名木犀、九里香等,是我國特產珍貴芳香花卉[1]。研究表明,桂花除富含蛋白質、脂肪、碳水化合物、多種氨基酸、維生素、微量元素等成分外,還富含黃酮類成分。由于黃酮類化合物具有抗腫瘤、治療心腦血管疾病、降血脂、抗氧化等多種生理功能[2-4],因此利用桂花原料制備天然黃酮類抗氧化產品具有潛在應用價值[5-7]。
采取超聲波輔助提取桂花總黃酮并對其含量進行測定,探討桂花總黃酮的最佳提取方法;同時對提取物的抗氧化性能進行了研究,以期為桂花的綜合利用提供理論依據。
1 材料與方法
1.1 材料
1.1.1 試劑 石油醚(沸點30~60 ℃),乙醇,鹽酸,蘆丁,亞硝酸鈉,硝酸鋁,氫氧化鈉。以上試劑均為分析純;水為去離子水,丹桂由福建浦城木犀園營養食品有限公司提供。
1.1.2 儀器 UV-2550紫外分光光度計、索氏脂肪提取器、R201D-Ⅱ旋轉蒸發儀、H-2050R高速離心機、KQ500B型超聲波清洗器、恒溫水浴鍋等。……