甲硫氨酸封端的金纳米团簇作为用于镉（II）传感的荧光增强探针。
Methionine-Capped Gold Nanoclusters as a Fluorescence-Enhanced Probe for Cadmium(II) Sensing.
作者信息
Peng Yan, Wang Maomao, Wu Xiaoxia, Wang Fu, Liu Lang
机构信息
Laboratory of Environmental Sciences and Technology, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China.
College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China.
出版信息
Sensors (Basel). 2018 Feb 23;18(2):658. doi: 10.3390/s18020658.
Gold nanoclusters (Au NCs) have been considered as novel heavy metal ions sensors due to their ultrafine size, photo-stability and excellent fluorescent properties. In this study, a green and facile method was developed for the preparation of fluorescent water-soluble gold nanoclusters with methionine as a stabilizer. The nanoclusters emit orange fluorescence with excitation/emission peaks at 420/565 nm and a quantum yield of about 1.46%. The fluorescence of the Au NCs is selectively and sensitively enhanced by addition of Cd(II) ions attributed to the Cd(II) ion-induced aggregation of nanoclusters. This finding was further used to design a fluorometric method for the determination of Cd(II) ions, which had a linear response in the concentration range from 50 nM to 35 μM and a detection limit of 12.25 nM. The practicality of the nanoprobe was validated in various environmental water samples and milk powder samples, with a fairly satisfactory recovery percent.
由于其超小尺寸、光稳定性和优异的荧光特性，金纳米团簇（Au NCs）被认为是新型重金属离子传感器。在本研究中，开发了一种绿色简便的方法，以蛋氨酸作为稳定剂制备荧光水溶性金纳米团簇。该纳米团簇发射橙色荧光，激发/发射峰分别位于420/565 nm，量子产率约为1.46%。由于Cd(II)离子诱导纳米团簇聚集，加入Cd(II)离子后，Au NCs的荧光被选择性且灵敏地增强。这一发现进一步用于设计一种荧光法测定Cd(II)离子，该方法在50 nM至35 μM的浓度范围内具有线性响应，检测限为12.25 nM。该纳米探针在各种环境水样和奶粉样品中的实用性得到验证，回收率相当令人满意。
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