Journal
NEW JOURNAL OF CHEMISTRY
Volume 42, Issue 2, Pages 1446-1456Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj03524a
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Funding
- National Natural Science Foundation of China [21645008, 21305042, 21375037]
- Hunan Provincial Education Department [14B116]
- Science and Technology Department [14JJ4030]
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- Hunan Normal University [KLCBTCMR2011-08]
- Key Laboratory of Jiangxi Province Persistent Pollutants Control and Resources Recycle [ST201422007]
- Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
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In this study, a facile and environment-friendly method for the preparation of bovine serum albumin (BSA) capped fluorescent Cu nanoclusters (BSA-CuNCs) was adopted. The as-prepared BSA-CuNCs were characterized by ultraviolet-visible spectroscopy (UV-Vis), fluorescent spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM). The fluorescence excitation and emission wavelength of BSA-CuNCs appeared at 325 and 406 nm, respectively. The as-synthesized BSA-CuNCs can be utilized as a bi-functional nanomaterial for pH sensing and dopamine (DA) detection with good performance. The fluorescence intensity decreased linearly with decrease in pH from 12 to 5 and increased linearly with increase in DA concentration from 0.5 to 50 mu M. TEM measurements proved that the decrease in the pH value resulted in the aggregation of BSA-CuNCs, leading to color change and the quenching of fluorescence. The FT-IR spectra, fluorescent spectra, UV-Vis spectra and zeta potential measurements demonstrated that DA can be combined with Cu2+ and the Cu2+ would be removed from the surface of BSA-CuNCs. As a result, the fluorescence was recovered owing to the formation of the highly stable compound CuH2(DA)(2). The pH value of five water samples was determined by the proposed method with relative errors of less than 0.91%. Furthermore, DA in human urine samples was also analyzed by BSA-CuNCs with good recoveries ranging from 90.4% to 104.7% using the standard addition method. It is believed that the bi-functional BSA-CuNCs will show great potential in bio-systems.
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