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作 者:周凌云[1,2] 鲁斌[1] 余小红[1] 张明芮[2] 华燕[1]
机构地区:[1]西南林业大学西南山地森林资源保育与利用教育部重点实验室,云南昆明650224 [2]皖南医学院安徽省多糖药物工程技术研究中心,安徽芜湖241002
出 处:《林产化学与工业》2018年第1期73-80,共8页Chemistry and Industry of Forest Products
基 金:西南林业大学科技创新基金资助(C15045;C15049);皖南医学院中青年科研基金资助(WK201610)
摘 要:通过清除1,1-二苯基-2-三硝基苯肼(DPPH)自由基法、2,2'-连氨-二(3-乙基苯并噻唑啉-6-磺酸)二铵盐(ABTS)自由基法、水杨酸法和邻苯三酚自氧化法,测定隐孔菌碱提物、乙酸乙酯提取物、60%乙醇提取物和水提醇沉物4个粗提部分的抗氧化活性,结果显示:乙酸乙酯提取物清除总自由基能力最强,其对ABTS自由基半数清除率(IC_(50))达到(67.43±1.41)mg/L。进一步对乙酸乙酯提取物进行活性追踪分离,得到9个倍半萜类化合物:隐孔酸A三甲酯(1),隐孔酸A(2),隐孔酸D四甲酯(3),隐孔酸D(4),隐孔酸C(5),隐孔酸C五甲酯(6),隐孔酸E五甲酯(7),隐孔酸B三甲酯(8)和隐孔酸B(9),其中化合物1、3、6和8为首次从该种真菌中分离得到。化合物1~9对ABTS自由基的清除能力测定结果显示化合物8有较高抗氧化活性,其(IC_(50)=(5.29±0.25)mg/L,清除能力优于阳性对照V_C,V_C的IC_(50)=(5.76±0.58)mg/L。The antioxidant activities of four extracts (alkali extracts, ethyl acetate extract, 60 % ethanol extract and crude polysaccharide) from Cryptoporus volvatus (Peck) Hubbard were evaluated by methods of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, 2, 2'-azino-di-( 3-ethyl-2, 3-dihydrobenzthiazoline-6-sulfonate) ( ABTS ), Salicylic acid, and Fenton reaction. The results indicated that ethyl acetate extract showed the strongest free radical scavenging ability with ICs0 = (67.43± 1.41 ) mg/L by the ABTS method. Further study by bioassay-guided fractionation of the ethyl acetate extract led to the isolation and identification of nine cryptoporic compounds including cryptoporic acid A trimethyl ester( 1), cryptoporic acid A( 2), cryptoporic acid D tetra- methyl ester( 3), cryptoporic acid D (4), cryptoporic acid C (5), cryptoporic acid C pentamethyl ester( 6), cryptoporic acid E pentamethyl ester(7), cryptoporic acid B trimethyl ester(8) and crytoporic acid B (9). Among them, compounds 1, 3, 6, 8 were isolated for the first time from this fungus. The results of the ABTS scavenging ability showed that compound 8 ( cryptoporic acid B trimethyl ester) has a higher antioxidant activity with IC50 = (5.29±0.25)mg/L than the positive control Vc with IC50 = (5. 76±0.58) mg/L. In addition, the structure-relationship of sesquiterpenes as antioxidant agents was analyzed.
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