李男男 李環明 薛春梅 趙永勛 李佳琳 杜春梅 李麗 靖桂云



摘要[目的]研究紫丁香蘑菌絲體粗多糖的抗氧化活性。[方法]采用微波輔助法提取紫丁香蘑菌絲體粗多糖,采用固液分離及離心法提取發酵液粗多糖,采用DPPH法、水楊酸比色法和鄰苯三酚自氧化法等研究粗多糖清除自由基能力的變化。[結果]菌絲體粗多糖和發酵液粗多糖均具有較強的抗氧化能力,但2種粗多糖的抗氧化能力有差異;菌絲體粗多糖清除自由基的能力高于發酵液粗多糖,在特定濃度范圍內,隨著多糖濃度的增加,其抗氧化能力也隨之增強,且呈量效依賴關系。[結論]菌絲體粗多糖和發酵液粗多糖均具有抗氧化能力,但菌絲體粗多糖抗氧化能力強于發酵液粗多糖。
關鍵詞紫丁香蘑;粗多糖;抗氧化活性;自由基
中圖分類號S646.1文獻標識碼A文章編號0517-6611(2017)14-0063-03
Abstract[Objective]To study the antioxidant activity of crude polysaccharide in Lepista nuda mycelium.[Method]The mycelium polysaccharide of Lepista nuda was extracted by microwaveassisted method.The crude polysaccharide of fermentation broth was extracted by solidliquid separation and centrifugation.The change in the capacity of crude polysaccharide scavenges free radical with the methods of DPPH,salicylic acid colorimetry and three phenol autoxidation was determined.[Result]The crude polysaccharide of mycelium and fermentation broth both had stronger antioxidant ability.However,the antioxidant capacity of two kinds of crude polysaccharide was different;The ability of scavenging free radical of polysaccharide from mycelium was stronger than that of polysaccharide in fermentation broth.In a certain range of concentration,if the concentration of polysaccharide increased its antioxidant capacity also increased,which was dosedependent.[Conclusion]The crude polysaccharide of mycelium and fermentation broth both had stronger antioxidant ability,and the former was stronger than the latter.
Key wordsLepista nuda;Crude polysaccharide;Antioxidant activity;Free radical
自由基生物學研究與腫瘤發生、心腦血管疾病、藥物中毒、人類機體衰老等過程均具有密切的關系,自由基包括超氧陰離子、有機氧自由基、輕自由基、單線態氧、無機和有機過氧化物等類型。正常情況下,生物機體在體內有氧代謝過程中會不斷地產生自由基,如果超出機體防御系統所具有的清除能力時,這些自由基會直接地或間接地損傷機體組織,誘發某些疾病的發生[1-2],因此自由基是機體細胞損傷及其癌變的原始誘發機制之一。部分天然抗氧化劑具有抗氧化物質,能減少對機體的損傷和危害。研究表明,食用菌多糖有效、無毒,具有清除自由基、提高抗氧化酶活性等作用,食用菌多糖將成為新型藥物、保健品和抗氧化劑開發和研究的理想來源[3]。……