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《Acta Botanica Boreali-occidentalia Sinica》 2005-03
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Microwave-assisted Extraction Techniques and Some Properties of Anthocyanidin in Loropetalum chinense var.rubrum Flowers

TANG Ke-hua~1,YU Hua-zhong~2,GONG Jian~1, ZHANG Tao~1,DAI Lan-fang~1,CHEN Gong-xi~2 (1 College of Biology and Environmental Sciences,Jishou University,Zhangjiajie,Hunan 427000,China;2 Hu'nan Key Laboratory for Forest Chemical Engineering,Jishou University,Zhangjiajie,Hu'nan 427000,China)  
The microwave-assisted extraction and the properties of L.chinense (R.Br) Oliv.var.rubrum Yieh.anthocyanidin were studied.Results showed that anthocyanidin maybe was a flavone soluble in EtOH,and very stable to acid,oxidant,light and heating-treatments,but sensitive to alkaline and Fe~(2+),Fe~(3+),Cu~(2+),Pb~(2+) conditions.With only one pre-microwave treatment,all red pigments in petals were extracted with 30% EtOH,and the three dominant factors affecting the extraction were the duration of microwave treatment,the operational volume and concentration of EtOH.The degradation rate of the red pigments by light and heating-treatments showed that the degradation rate of anthocyanidin at different temperatures was very slow,but it tended to increase with increased temperatures.Between the degradation rate and heating-treatment time,there was a A~t and lnA~t linear correlation within 90℃~100℃,but only the lnA~t showed a linear correlation at 80℃ when heating-treatment temperature was lower than 90℃.There was no A~t and lnA~t linear correlation between degradation rate and light treatment time,and degradation rate of anthocyanidin was hardly affected by no-stop light.
【Fund】: 湖南省教育厅自然科学基金资助项目( 0 2 C3 11) ;; 吉首大学生态学重点学科基金资助项目
【CateGory Index】: Q946.8
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