Jiang M.Y.,Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education |
Jiang M.Y.,Fuzhou University |
Li J.Q.,Fuzhou University |
Wu Y.Q.,Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education |
And 7 more authors.
Journal of Aerosol Science | Year: 2011
In order to obtain the exact chemical structure and further discuss the global warming effect of elemental carbon (EC) particles, the morphology and the chemical structure of EC particles emitted from diesel vehicles were first investigated in detail using scan electron microscopy equipped with an energy dispersive X-ray spectrometer (SEM-EDX), matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS), Fourier Transformation Infrared (FT-IR) spectrum and 13C Nuclear Magnetic Resonance (NMR) spectrum in this study. The SEM-EDX results showed that EC particles emitted from diesel bus are 50nm spherical particles with smooth surface and an O/C ratio (mass ratio) of 0.07±0.01. The 50nm EC particles were further deduced to be an aggregate of new fullerene C36(OH)2 according to the results of MALDI-TOF-MS, FT-IR and 13C NMR. Fullerenes smaller than 60C were considered to be unstable since they cannot fulfill the so-called isolated pentagon rule. So far, most of our knowledge regarding small fullerenes comes from gas-phase experiments and theoretical investigations, the production and separation of small fullerene solids in the macroscopic quantity has been reported. The present report is the first discovery of C36(OH)2-based solid. © 2011 Elsevier Ltd. Source
Chen J.,Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education |
Liu B.,Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education |
Song X.,Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education |
Tong P.,Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education |
And 2 more authors.
Science China Chemistry | Year: 2015
As microRNAs (miRNAs) are aberrantly expressed in a variety of cancers, detecting them precisely is of great importance. Here we constructed a sensitive and selective enzyme-free sensing platform for miRNA detection based on target-catalyzed hairpin assembly and magnesium ion-dependent deoxyribozyme (Mg2+-dependent DNAzyme). This sensing method introduces two amplification circuits simultaneously and shows a low detection limit of 1 pmol/L. This enzyme-free method is especially preferred because of its facility and economy. Furthermore, this amplified sensor shows high selectivity for discriminating perfectly complementary target and other mismatched RNAs. Therefore, the established strategy could be used as a simple, sensitive and selective method for target miRNA detection. © 2015 Science China Press and Springer-Verlag Berlin Heidelberg Source