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fluorescent Labeling of Nanometer Hydroxyapatite

Journal of Materials Science & Technology 2008年第2期24卷 187-191页

作者： Yuan ZHANG Yuan YUAN Changsheng LIU Key Laboratory for Ultrafine Materials of Ministry of Education and Engineering Research Center for Biomedical Materials of Ministry of Education East China University of Science and Technology Shanghai 200237 China

A novel surface treatment method using 3-aminopropyltriethoxysilane （AMPTES）, was developed to immobilize the fluorescein molecule on nano-HAP （nanometer hydroxyapatite） powders. By pretreating the nano-HAP powders surface with AMPTES, fluorescein, chosen on the basis of the chemical structure of the nano- HAP powders, could be bound to the nano-HAP powders surface. The chemical compositions of nano-HAP before and after being labeled were characterized by Fourier transform infrared spectroscopy （FTIR） and X-ray photoelectron spectroscopy （XPS）. The morphology, phase composition, and the fluorescence characteristics of the nano-HAP powders with and without staining were also investigated. The FTIR and XPS results revealed that fluorescein had been successfully immobilized on the surface of AMPTES-bound nano-HAP powders via the acylamide bond formation between the -COOH of fluorescein and the -NH2 of AMPTES. The labeled nano-HAP powders possessed strong fluorescent intensity with a little deviation from the maximum emission wavelength of fluorescein. But the morphology and phase composition had no obvious alteration. Under fluorescence microscopy, the labeled nano-HAP powders, even after 24 h cell incubation, exhibited strong fluorescence.

关键词： Nano-HAP Fluorescein Silane coupling agent fluorescent intensity

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Upconversion Luminescence from Ho3＋ and Yb3＋ Codoped α-NaYF4 Single Crystals

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Chinese Journal of Chemical Physics 2015年第3期28卷 351-354,I0002页

作者： Jia-zhong Zhang Hai-ping Xia Shuo Yang Yong-zhang Jiang Xue-mei Gu Jian-li Zhang Hao-chuan Jiang Bao-jiu Chen Key laboratory of Photoelectronic Materials Ningbo University Ningbo 315211 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315211 China Department of Physics Dalian Maritime University Dalian 116026 China

The Ho3＋/yb3＋ co-doped a-NaYF4 single crystal was grown successfully for the first time by a modified Bridgman method in which KF was used as assisting flux and a large temperature gradient （70-90℃ /cm） of solid-liquid interface was adopted. Upconversion emissions at green -544 nm, red -657 and -751 nm were obtained under 980 nm laser diode excitation. The intensity at -544 nm was much stronger than those of -657 and -751 nm. The mechanisms of the upconversion emissions were investigated by studying the relationship between the upconversion intensity and pump power. The optimized Yb3＋ concentration was about 8.08moi% when Ho3＋ concentration was hold at about 1.0mol%. The results showed that Ho3＋/yb3＋ doped α-NaYF4 single crystal was a possible candidate upconversion material for the green solid-state laser.

关键词： Ho3+/yb3+ a-NaYF4 single crystal fluorescent intensity Upconversion

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Toxicity and bio-distribution of carbon dots after single inhalation exposure in vivo

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Chinese Chemical Letters 2018年第6期29卷 895-898页

作者： Yue Yang Xiangling Ren Zhenning Sun Changhui Fu Tianlong Liu Xianwei Meng Zili Wang College of Animal Science and Technology Southwest University Chongqing 400716 China Laboratory of Controllable Preparation and Application of Nanomaterials CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China College of Veterinary Medicine China Agricultural University Beijing 100193 China

Because of the advantages of excellent light stability, carbon dots（CDs） are considered to be a promising agent in the bio-marker application. Nevertheless, there are many unresolved issues with the toxicity of CDs in vitro and in vivo. In the study, CDs were synthesized by citric acid and ethylenediamine into deionized water, then the inhalation toxicity and bio-distribution of CDs in vivo were systematically assessed. The results showed that CDs caused animals death at higher dosages and induced injury in the lung and liver including inflammation and necrosis after single inhalation exposure at 5, 2 and 1 mg/kg dosages of the CDs. We also found that the injury increase with a dose-dependent and time-dependent manner. fluorescent examination and TEM results showed that CDs mainly located at the lung and *** the fluorescent intensity increase with a time-dependent manner. This study provides a theoretical basis of the respiratory toxicity of CDs, and provides a basis for the use of CDs as a bio-marker.

关键词： Carbon dots Toxicity Bio-distribution Inhalation fluorescent intensity

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Fluorescence Studied of Dissociation Constant of Cyclodextrin With Phenol Derivatives

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Chemical Research in Chinese Universities 2001年第Z1期17卷 232-233页

作者： ZHANG YouMing Department of Chemistry Northwest Normal University

α-and β-cyclodextrins consisting of six and seven glucose residues respectively, have lipophilic cavities with different inner diameters. They form host-guest inclusion complexes with hydrophobic organic and organometallic guest molecules in aqueous solution. These host-guest complexes have proved to be excellent model systems for studying the nature of noncovalent bonding forces in aqueous media. They have provided valuable insights into the hydrophobic effect and London dispersion forces and are good model for understanding the specificity of enzyme substrate interactions [1] Evidence for the formation of inclusion complexes have been provided from calovimetric titration [2] NMR[33], circular dichroism[4], U V[1] and fluorescence spectra[5] and conductometric method[6] etc. H ere we report a new fluorimetric method for a study on the reaction of the host-guest inclusion complexes of cyclodextrin with phenols. Dissociation constants (Kd) of the inclusion complexes of some phenols with α-β-cyclodextrin are estimated based on the variation of the fluorescent intensity and modified Harad' equations.

关键词： inclusion complexes fluorescent intensity fluorescence spectra dispersion forces aqueous solution aqueous media nature of

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