Variation Rule of Hydroxytyrosol Content in Olive Leaves
YE Jian-zhong1,2,WANG Cheng-zhang1,2,CHEN Hong-xia1,ZHOU Hao1(1.Institute of Chemical Industry of Forestry Products,CAF;National Engineering Lab.for Biomass Chemical Utilization;Key and Open Lab.on Forest Chemical Engineering,SFA;Key Lab.of Biomass Energy and Material,Jiangsu Province;Nanjing 210042,China;2.Institute of New Technology of Forest,CAF,Beijing 100091,China)
Hydroxytyrosol was extracted from 5 breeds of olive leaves from different tree ages by ultrasonic extraction using 90 % MeOH-H2O and analyzed by HPLC method.Simultaneously,the conversion trend of oleuropein into hydroxytyrosol was investigated from 10 breeds of olive leaves stored over 3 years.Results showed that:content of hydroxytyrosol in a growing year has one high peak period namely May and Jun.,and one low trough period,namely Nov.and Dec..Huge differences existed among different breeds.The content of hydroxytyrosol of 6 years age trees is higher than that of 18 years age.Erzhi No.8 olive leaves of 6 years age in May have the highest hydroxytyrosol content of 0.768 %,in contrary,6 years age Jiufeng No.6 olive leaves in Dec.have the lowest hydroxytyrosol content of 0.058 %.In leaves from 10 breeds of over 18 years age stored over 3 years,the content of oleuropein is greatly reduced,while the content of hydroxytyrosol is doubled.It means that a lot of oleuropein was degraded in hydroxytyrosol during the storage period.
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WANG Cheng-zhang1,GAO Cai-xia1,YE Jian-zhong1,CHEN Xi-juan1,JIANG Wen-ying2(1.Institute of Chemical Industry of Forest Products,CAF;Key and Open Lab.on Forest Chemical Engineering,SAF,Nanjing 210042,China; 2.Gansu Academy of Forestry,Lanzhou 730000,China);Study on Seasonal Variation of Oleuropein Content in Olive Leaves by HPLC[J];Chemistry and Industry of Forest Products;2008-06 |
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XU Yuan-jun,LUO Li-ping,LI Yan,CHEN Bin,FU Yu-xin,GAO Yin-yu(College of Life Sciences and Food Engineering,Nanchang University,Nanchang 330031,China);Analyses on Chemical Compositions of Ethanolic Extractives of Propolis Collected from Two Regions in China by HPLC[J];Chemistry and Industry of Forest Products;2010-02 |
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LI Chen1,2,ZHENG Yuan-yuan1,3,HUANG Xin-yi1,WANG Xiao-fei1,DI Duo-long1(1.Key Laboratory of Chemistry of Northwestern Plant Resources & Key Laboratory for Natural Medicine of Gansu Province,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou730000,China;2.Instrumental Analysis & Research Center,School of Applied Physics & Material Engineering,Wu Yi University,Jiangmen529020,China;3.Pharmaceutical College,Lanzhou University,Lanzhou730000,China);Study on the Content Determination of Oleuropein in Olea europaea L. Leaves by Substraction of UV-Visible Spectroscopy[J];Journal of Instrumental Analysis;2011-03 |
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