[Objective]To optimize the ultrasonic-assisted extraction process of chlorogenic acid from sunflower meal.[Method]Based on the single-factor test,the extraction factors of ethanol concentration,extraction temperature ...[Objective]To optimize the ultrasonic-assisted extraction process of chlorogenic acid from sunflower meal.[Method]Based on the single-factor test,the extraction factors of ethanol concentration,extraction temperature and extraction time were optimized using the response surface methodology with the extraction rate of chlorogenic acid as the response value.[Result]The optimum extraction conditions of chlorogenic acid from sunflower meal were 57% of ethanol concentration,39 min of extraction time,53℃ of extraction temperature,100 W of ultrasonic power,1:14(g/ml)of solid-liquid ratio and one time of extraction.Under these conditions,the extraction rate of chlorogenic acid was 2.25%.[Conclusion]Ultrasonic assisted extraction method has high extraction rate but short time,the study provides a theoretical basis for the industrialized production of chlorogenic acid in sunflower meal.展开更多
We report on a white hybrid light-emitting device employing a mixture of ternary CdSe/ZnS quantum dots(QDs)as an emitting layer(EML)and a small molecular material tris(8-hydroxyquinoline)aluminum(Alq3)as an electron-t...We report on a white hybrid light-emitting device employing a mixture of ternary CdSe/ZnS quantum dots(QDs)as an emitting layer(EML)and a small molecular material tris(8-hydroxyquinoline)aluminum(Alq3)as an electron-transporting layer.The film morphology of the spin-coated mixture of QDs is strongly improved via thermal annealing,and therefore a close-packed QD-EML is realized between organic charge-transporting layers.As a result,compared to the device with an unannealed QD-EML,the emission of Alq3 is deeply suppressed.In addition,a maximum luminance of more than 1000 cd/m2 and a maximum luminous efficiency of 2.2 cd/A are achieved.展开更多
基金Supported by the Science and Technology Program of Jilin Education Department during the"Eleventh-Five Year Plan" (Jilin[2010]No.206)
文摘[Objective]To optimize the ultrasonic-assisted extraction process of chlorogenic acid from sunflower meal.[Method]Based on the single-factor test,the extraction factors of ethanol concentration,extraction temperature and extraction time were optimized using the response surface methodology with the extraction rate of chlorogenic acid as the response value.[Result]The optimum extraction conditions of chlorogenic acid from sunflower meal were 57% of ethanol concentration,39 min of extraction time,53℃ of extraction temperature,100 W of ultrasonic power,1:14(g/ml)of solid-liquid ratio and one time of extraction.Under these conditions,the extraction rate of chlorogenic acid was 2.25%.[Conclusion]Ultrasonic assisted extraction method has high extraction rate but short time,the study provides a theoretical basis for the industrialized production of chlorogenic acid in sunflower meal.
基金Supported by the National Basic Research Program of China under Grant No 2010CB327701the National Natural Science Foundation of China under Grant Nos 60977024 and 60907021.
文摘We report on a white hybrid light-emitting device employing a mixture of ternary CdSe/ZnS quantum dots(QDs)as an emitting layer(EML)and a small molecular material tris(8-hydroxyquinoline)aluminum(Alq3)as an electron-transporting layer.The film morphology of the spin-coated mixture of QDs is strongly improved via thermal annealing,and therefore a close-packed QD-EML is realized between organic charge-transporting layers.As a result,compared to the device with an unannealed QD-EML,the emission of Alq3 is deeply suppressed.In addition,a maximum luminance of more than 1000 cd/m2 and a maximum luminous efficiency of 2.2 cd/A are achieved.
