Copper oxides and its salts are now widely used as pesticides to control fungal and bacterial diseases of field crops. Copper toxicity is often a major contributor of human health problems caused through accumulation ...Copper oxides and its salts are now widely used as pesticides to control fungal and bacterial diseases of field crops. Copper toxicity is often a major contributor of human health problems caused through accumulation of excess copper ions in various organs via drinking water, fruits and vegetables. So, detection and estimation of cupric ions in biological organs, drinking water, fruits and vegetables are extremely important. Recently, a fluorescence based sensor using coumarin dye (high quantum yield) has been proposed to detect micromolar Cu++ ion in biological organs. But major problem with coumarin dye is that it is insoluble in water and undergoes dye-dye aggregation in organic solvents. We proposed here a synthetic scheme of preparation of graphene oxide conjugated coumarin dye derivative which would be water dispersible and expected to be an ideal candidate for Cu2+ ion estimation in biological organs and drinking water.展开更多
A novel fluorescent probe,6-（N,N-dimethylamino）-2-naphthoylacryl acid（ACADAN） was designed and synthesized as a fluorescent sensor for Cu^2＋ in aqueous media.Significant amplification of fluorescence signals with...A novel fluorescent probe,6-（N,N-dimethylamino）-2-naphthoylacryl acid（ACADAN） was designed and synthesized as a fluorescent sensor for Cu^2＋ in aqueous media.Significant amplification of fluorescence signals without causing any discernible change of maximum fluorescence emission wavelength（λ max） was observed upon the addition of Cu^2＋.Importantly,ACADAN is capable of recognizing Cu^2＋ selectively in aqueous media in the presence of various biologically relevant metal ions and the prevalent toxic metal ions in the environment with high sensitivity（detection limit was 0.1 μmol/L）.展开更多
合成了弱配体柠檬酸三钠修饰的Cd S量子点（Cit-Cd S QDs）,透射电子显微镜表征结果表明,Cit-Cd S QDs的粒径分布均匀（4～6 nm）,分散性好。研究了金属离子（银（Ⅰ）离子、镉（Ⅱ）离子）、巯基化合物（巯基乙酸、半胱氨酸）以及金属...合成了弱配体柠檬酸三钠修饰的Cd S量子点（Cit-Cd S QDs）,透射电子显微镜表征结果表明,Cit-Cd S QDs的粒径分布均匀（4～6 nm）,分散性好。研究了金属离子（银（Ⅰ）离子、镉（Ⅱ）离子）、巯基化合物（巯基乙酸、半胱氨酸）以及金属离子（银（Ⅰ）离子、镉（Ⅱ）离子）与巯基化合物形成的配合物对Cit-Cd S QDs荧光的影响。发现金属离子（银离子、镉离子）与巯基化合物（巯基乙酸、半胱氨酸）形成的水溶性配合物可以显著增强Cit-Cd S QDs的荧光,配合物对Cit-Cd S QDs的增强程度比单独的金属离子或巯基化合物均要高,而且配合物修饰的Cd S QDs对铜（Ⅱ）离子的响应要高于单独用金属离子或巯基化合物修饰的量子点。建立了铜（Ⅱ）离子高灵敏度荧光检测方法,该方法检测范围宽（1.0×10^-8～1.0×10^-6mol/L）,检测限低（1.0×10^-9mol/L）且具有很好的选择性,拓展了配合物作为量子点修饰剂的应用。展开更多
文摘Copper oxides and its salts are now widely used as pesticides to control fungal and bacterial diseases of field crops. Copper toxicity is often a major contributor of human health problems caused through accumulation of excess copper ions in various organs via drinking water, fruits and vegetables. So, detection and estimation of cupric ions in biological organs, drinking water, fruits and vegetables are extremely important. Recently, a fluorescence based sensor using coumarin dye (high quantum yield) has been proposed to detect micromolar Cu++ ion in biological organs. But major problem with coumarin dye is that it is insoluble in water and undergoes dye-dye aggregation in organic solvents. We proposed here a synthetic scheme of preparation of graphene oxide conjugated coumarin dye derivative which would be water dispersible and expected to be an ideal candidate for Cu2+ ion estimation in biological organs and drinking water.
基金Supported by the National Natural Science Foundation of China(Nos.30672560,81172982)the Accented Project for Natural Scientific Research of Universities in Guangdong Province,China(No.05Z012)
文摘A novel fluorescent probe,6-（N,N-dimethylamino）-2-naphthoylacryl acid（ACADAN） was designed and synthesized as a fluorescent sensor for Cu^2＋ in aqueous media.Significant amplification of fluorescence signals without causing any discernible change of maximum fluorescence emission wavelength（λ max） was observed upon the addition of Cu^2＋.Importantly,ACADAN is capable of recognizing Cu^2＋ selectively in aqueous media in the presence of various biologically relevant metal ions and the prevalent toxic metal ions in the environment with high sensitivity（detection limit was 0.1 μmol/L）.
基金Sate Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Guangxi Normal University), Nation al Natural Science Foundation of China (21372117), Fok Ying Tung Education Foundation (141030), Research Fund for the Doctoral Program
文摘合成了弱配体柠檬酸三钠修饰的Cd S量子点（Cit-Cd S QDs）,透射电子显微镜表征结果表明,Cit-Cd S QDs的粒径分布均匀（4～6 nm）,分散性好。研究了金属离子（银（Ⅰ）离子、镉（Ⅱ）离子）、巯基化合物（巯基乙酸、半胱氨酸）以及金属离子（银（Ⅰ）离子、镉（Ⅱ）离子）与巯基化合物形成的配合物对Cit-Cd S QDs荧光的影响。发现金属离子（银离子、镉离子）与巯基化合物（巯基乙酸、半胱氨酸）形成的水溶性配合物可以显著增强Cit-Cd S QDs的荧光,配合物对Cit-Cd S QDs的增强程度比单独的金属离子或巯基化合物均要高,而且配合物修饰的Cd S QDs对铜（Ⅱ）离子的响应要高于单独用金属离子或巯基化合物修饰的量子点。建立了铜（Ⅱ）离子高灵敏度荧光检测方法,该方法检测范围宽（1.0×10^-8～1.0×10^-6mol/L）,检测限低（1.0×10^-9mol/L）且具有很好的选择性,拓展了配合物作为量子点修饰剂的应用。
