Copper Quantum Clusters in Protein Matrix: Potential Sensor of Pb2+ Ion

详细信息    查看全文

• 作者：Nirmal Goswami ; Anupam Giri ; M. S. Bootharaju ; Paulrajpillai Lourdu Xavier ; Thalappil Pradeep ; Samir Kumar Pal
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：December 15, 2011
• 年：2011
• 卷：83
• 期：24
• 页码：9676-9680
• 全文大小：864K
• 年卷期：v.83,no.24(December 15, 2011)
• ISSN：1520-6882

文摘

A one-pot synthesis of extremely stable, water-soluble Cu quantum clusters (QCs) capped with a model protein, bovine serum albumin (BSA), is reported. From matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry, we assign the clusters to be composed of Cu₅ and Cu₁₃ cores. The QCs also show luminescence properties having excitation and emission maxima at 325 and 410 nm, respectively, with a quantum yield of 0.15, which are found to be different from that of protein alone in similar experimental conditions. The quenching of luminescence of the protein-capped Cu QCs in the presence of very low hydrogen peroxide concentration (approximately nanomolar, or less than part-per-billion) reflects the efficacy of the QCs as a potential sensing material in biological environments. Moreover, as-prepared Cu QCs can detect highly toxic Pb²⁺ ions in water, even at the part-per-million level, without suffering any interference from other metal ions.