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	1. Novel Polyurethane Ionomer Nanoparticles Interaction with DNA and Cell Uptaken
	LUO Wenping,HU Jiongsheng,WU Jie,ZHAO Xinyue,HUANG Caoxizi,YE Yu,LI Dong,LIU Hongke
	Chemistry 30 July 2017
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (4K B)

	Abstract:It is well known that nanomaterials are widely used in biomedicine as imaging tools, phototherapy agents, and gene delivery carriers. Here, we report the synthesis and characterization of novel amphiphilic polyurethane nanoparticles (APU NPs), and the interaction of the APU NPs with CT-DNA and cell-penetrating. The physical properties and chemical composition of APU NPs were characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), zeta potential and nuclear magnetic resonance (NMR). The interactions with CT-DNA were investigated by circular dichroism (CD) and ultraviolet-visible (UV-Vis) spectroscopies. The cell membranes penetration were characterized by fluorescence inverted microscope and HEK293 cell was used. These results showed that the APU NPs might cause slight conformational change in CT-DNA, and the APU NPs could efficiently internalized into the HEK293 cells without overt membrane disruption.In particular,50 nm of the nanoparticles can enter the cell by effectively penetrating cell membrane and no damage.
	TO cite this article:LUO Wenping,HU Jiongsheng,WU Jie, et al. Novel Polyurethane Ionomer Nanoparticles Interaction with DNA and Cell Uptaken[OL].[30 July 2017] http://en.paper.edu.cn/en_releasepaper/content/4739221


	2. Density Functional Theory Characterization of Metallofullerenes La2C92: La2C2@C90 or La2@C92?
	GUAN Wenjuan,LI Qiaozhi,ZHAO Xiang
	Chemistry 21 June 2017
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	Abstract:By using density functional theory computations in conjunction with statistic mechanics analyses, the cage-selectivity of endohedral metallofullerenes La2C92 is investigated. Results indicate that isomers La2C2@C1(84069)-C90, La2C2@C2(99913)-C90 in carbide cluster metallofullerenes (CCMFs) La2C2@C90 and La2@D3-(126408)-C92, La2@C1-(126367)-C92 in dimetallofullerenes (di-EMFs) La2@C92 are the most favorable La2C92 candidates, in which the isomer La2C2@C2(99913)-C90 has been successfully isolated and characterized experimentally. In addition, those two CCMF isomers exhibit superior thermodynamic abundances than above-mentioned di-EMFs, though the latter ones are more favorable in potential energies. Furthermore, the electronic, orbital, and spectral analyses of those four isomers are conducted to help the further experimental characterization of La2C92 series.
	TO cite this article:GUAN Wenjuan,LI Qiaozhi,ZHAO Xiang. Density Functional Theory Characterization of Metallofullerenes La2C92: La2C2@C90 or La2@C92?[OL].[21 June 2017] http://en.paper.edu.cn/en_releasepaper/content/4737905


	3. Aptamer-modified Semiconductor Quantum Dots for Biosensing Applications
	WEN Lin,ZHANG xiaobing
	Chemistry 07 June 2017
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	Abstract:Semiconductor quantum dots have attracted growing interest in biosensing area, because of their unique properties, such as narrow and symmetric emission with tunable colors, high quantum yield, high stability and controllable morphology. The introduction of various reactive functional groups on the surface of semiconductor quantum dots allows us to conjugate a spectrum of ligands, antibodies, peptides, or nucleic acids for broader and smarter applications. Among these ligands, aptamers exhibit many advantages including small size, high chemical stability, simple synthesis with high batch-to-batch consistence and convenient modification. More importantly, it is facile to introduce nucleic acid amplification strategies and/or nanomaterials to improve the sensitivity of aptamer-based sensing systems. Therefore, the combination of semiconductor quantum dots and aptamers brings more opportunities in bioanalysis. In this review, we summarize recent advances of aptamer-functionalized semiconductor quantum dots in biosensing applications. Firstly, we discuss the structure and properties of semiconductor quantum dots, as well as aptamers. Then, the application of biosensors based on aptamer-modified semiconductor quantum dots is discussed in the context of different signal transducing mechanisms, including optical, electrochemical and electrogenerated chemiluminescence approaches. Finally, we provide our perspectives on the current challenges and opportunities in this promising field.
	TO cite this article:WEN Lin,ZHANG xiaobing. Aptamer-modified Semiconductor Quantum Dots for Biosensing Applications[OL].[ 7 June 2017] http://en.paper.edu.cn/en_releasepaper/content/4737088


	4. Optimization on production technology of nano silica
	YIN Xiangbin,OU Encai,XU Weijian
	Chemistry 24 May 2017
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	Abstract:In this paper, chemical precipitation was used to produce nano silica in the presence of polyvinylpyrrolidone (PVP) and cetyltrimethyl ammonium bromide (CTAB) as composite dispersant. The structure and property of samples were characterized by IR, XRD, SEM and BET. The results indicates that the product with small particle size ,large specific surface area and high oil adsorption value can be prepared under these conditions: concentrati

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