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Quantitative Nuclear Magnetic Resonance (qNMR) is widely used to determine the purity of organic compounds. For the compounds with lower purity especially molecular weight more than 500, qNMR is at risk of error for the purity, because the impurity peaks are likely to be incompletely separated from the peak of major component. In this study, an offline ISRC-HPLC-qNMR (internal standard recovery correction...
A sandwich-like composite composed of ordered mesoporous carbon–silica shell-coated graphene (denoted as graphene@mSiO2-C) was prepared by an in-situ carbonation strategy. A mesoporous silica shell was synthesized by a sol–gel method, and cetyltrimethyl ammonium bromide inside the mesopores were in-situ carbonized as a carbon source to obtain a carbon–silica shell. The resulting mesoporous carbon–silica...
Precise measurement for the purity of organic compounds will fundamentally improve the capabilities and measurement services of the organic chemical analysis. Quantitative nuclear magnetic resonance (qNMR) is an important method to assess the purity of organic compounds. We presented a precise measurement method for the purity of small molecule with identification of impurities. In addition, the qNMR...
A simple and rapid analytical method for the separation of trace amounts of gallium and germanium from aqueous solution by solid-phase extraction with nano-particles was developed. It was found that only Ga(III) could be quantitatively retained on nano-SiO 2 in the pH range of 3–4 and 8–12 while Ge(IV) was not adsorbed, but both Ga(III) and Ge(IV) ions could be adsorbed quantitatively on nano-TiO...
3-Mercaptopropyl acid-stabilized CdTe nanoparticles synthesized in aqueous solution are found to be able to conjugate with peptides or proteins mediated by N-hydroxysulfo-succinimide (NHS) but 1-ethyl-3(3-dimethylaminopropyl) carbodiimides hydrochloride (EDC). The reaction time and pH have been optimized. Gel-permeation HPLC was applied following the conjugation, which could quickly and simultaneously...
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