




摘要:測定了木槿花醇溶性色素在可見光區的最大吸收波長;在單因素試驗的基礎上,采用正交試驗,以吸光度與浸提液總體積之積為指標,對提取溫度、浸提時間、超聲時間和料液比進行優選研究,采用鄰苯三酚自氧化法考察該色素清除超氧自由基活性。結果顯示最佳提取工藝條件為提取溫度40℃,料液比1∶50(W/V,g∶mL),浸提時間1 h(包括超聲時間45 min);該色素具有一定的清除超氧自由基活性。
關鍵詞:木槿花;醇溶性色素;正交試驗;超氧自由基
中圖分類號:S685.99 文獻標識碼:A文章編號:0439-8114(2011)16-3378-03
Study on Ethanol-soluble Pigment Extraction and Ability to Scavenge Superoxide Radicals from Hibiscus syriacus L.
GENG Ming-jiang1,FAN Bing-lin1,LI Qin2,ZHANG Huai-kun3
(1.Department of Chemistry, Xinxiang Medical University, Xinxiang 453003,Henan, China; 2.Analysis & Test Laboratory, Xinxiang Medical University, Xinxiang 453003,Henan, China; 3.Xinxiang Preschool Normal School, Weihui 453100,Henan, China)
Abstract: The maximum absorption wavelength of the red pigment from Hibiscus syriacus L. was mensurated. On the basis of single factor tests, orthogonal design was carried out to find the optimum extracting technology by detecting the product of the absorbance and the solvent volume (A·V), among extracting temperature, soaking time, ultrasonic time and material-solvent ratio. The pyrogallol autoxidation method was used to evaluate the capability to scavenge superoxide radicals of the red pigment. The results indicated that the optimum technology was extracting temperature 40 ℃, material-solvent ratio 1∶50(W/V,g∶mL), soaking time 1h(including ultrasonic time 45 min), and the red pigment has the capability to scavenge superoxide radicals.
Key words: Hibiscus syriacus L.; ethanol-soluble pigment; orthogonal test; superoxide radicals
木槿(Hibiscus syriacus L.)屬于錦葵科木槿屬落葉喬木,夏季滿枝綴花,花朵大而艷麗,花、葉對SO2、NOx具有較強的吸收性和耐受性[1],因而被廣泛用作庭院、街道的綠化植物。此外,木槿還是一種重要的藥用植物,其根、皮、花、種子皆可入藥[2,3]。Kwon等[4]考察了熱處理對木槿枝、根醇提取物抗氧化活性的影響。金月亭等[5]證實木槿花的乙醇研磨液具有一定的抑菌、促進凝血的活性。景立新等[6]從營養價值的角度對木槿花進行了研究。蔣新龍的研究小組先后對木槿花中的總黃酮[7]、紅色素[8]的提取工藝進行了探討。本試驗以干燥粉碎的重瓣紫色木槿花花瓣為原料,對木槿花醇溶性色素的提取工藝及其清除超氧自由基活性進行研究,以期為木槿花色素的研究開發提供依據。
1材料與方法
1.1材料
1.1.1木槿花木槿花于2010年8月采摘于河南省新鄉市新中大道,花瓣經35~40 ℃鼓風干燥48 h,粉碎后避光保存備用。
1.1.2試劑維生素C,美國Sigma公司,其他所用試劑均為國產分析純,使用前未進行任何純化處理。……