绿茶碳量子点对1,1-二苯基-2-苦基肼自由基的清除作用研究  

Study on the Scavenging Effect of Green Tea Carbon Quantum Dots on 1,1-Diphenyl-2-Picrylhydrazine Fee Radicals

作　　者：张雅晴 王昕 朱昌健 王英特[1] 王云霞 张勇[1] ZHANG Yaqing;WANG Xin;ZHU Changjian;WANG Yingte;WANG Yunxia;ZHANG Yong(School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China;Shanxi Lüshanyuan Wine Industry Limited company,Taiyuan 030063,China)

机构地区：[1]山西大学化学化工学院,山西太原030006 [2]山西绿膳源酒业有限公司,山西太原030063

出　　处：《山西大学学报（自然科学版）》2022年第6期1600-1608,共9页Journal of Shanxi University(Natural Science Edition)

基　　金：2020年度山西省研究生教育创新项目(2020SY031);2020年度小店区-山西大学产学研合作项目;山西省自然科学基金(201801D121074);2022年度山西省研究生教育创新项目(2022Y161)。

摘　　要：文章分别以绿茶、燕麦、菠菜、西兰花、葡萄籽、番茄,核桃和草莓为碳源,采用水热法合成了8种碳量子点(CQDs)。所合成的绿茶CQDs的量子产率为3.52%。利用红外光谱、紫外吸收光谱、荧光光谱、光电子能谱对CQDs的结构和光学性能进行了表征,并用透射电镜对其形貌进行了观察。结果显示绿茶CQDs呈球形,平均粒径约为3.25 nm,表面富有含氧官能团,具有良好的水溶性。在365 nm紫外光激发下发出亮蓝色荧光,最大激发与发射波长分别为380 nm和460 nm。8种CQDs分别用于清除1,1-二苯基-2-苦基肼自由基(DPPH),结果发现绿茶CQDs对DPPH自由基清除率最大,清除率达到94.1%,与抗坏血酸相近(94.5%)。绿茶CQDs对DPPH自由基的EC50值为9.97μg/m L。In this study,eight kinds of carbon quantum dots(CQDs)were synthesized by hydrothermal method using green tea,oats,spinach,broccoli,grape seed,tomato,walnut and strawberry as carbon sources,respectively.The quantum yield of the synthesized green tea CQDs was 3.52%.The structure and optical properties of CQDs were characterized by FT-IR,ul-traviolet absorption spectroscopy,fluorescence spectroscopy,and X-ray photoelectron spectroscopy,and their morphology was observed by transmission electron microscopy.The results showed that the green tea CQDs are spherical,with an average particle size of about 3.25 nm,and emit bright blue fluorescence under 365 nm ultraviolet light excitation.The maximum excitation and emission wavelengths are 380 nm and 460 nm,respectively.Eight CQDs were used to scavenge 1,1-diphenyl-2-picrylhydrazine(DPPH)free radical,respectively.The results showed that the green tea CQDs had the highest DPPH free radical scavenging rate(94.1%),which was comparable to that of ascorbic acid(94.5%).The EC50value of the green tea CQDs for DPPH free radicals scavenging is 9.97μg/m L.

关 键 词：绿茶 碳量子点 1 1-二苯基-2-苦基肼自由基 

分 类 号：TB383[一般工业技术—材料科学与工程]