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Ramesh Bokka Sarma Vanka Uma Maheswara Kumar Katragunta Babu Katragadda Suresh Devi Potturi Sita 《平面色谱法杂志一现代薄层色谱法》2015,28(4):280-286
JPC – Journal of Planar Chromatography – Modern TLC - The isolation and characterization of bioactive compounds from medicinal plants is usually a significant challenge in phytochemical... 相似文献
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Robichaud G Dixon RB Potturi AS Cassidy D Edwards JR Sohn A Dow TA Muddiman DC 《International journal of mass spectrometry》2011,300(2-3):99-107
Through a multi-disciplinary approach, the air amplifier is being evolved as a highly engineered device to improve detection limits of biomolecules when using electrospray ionization. Several key aspects have driven the modifications to the device through experimentation and simulations. We have developed a computer simulation that accurately portrays actual conditions and the results from these simulations are corroborated by the experimental data. These computer simulations can be used to predict outcomes from future designs resulting in a design process that is efficient in terms of financial cost and time. We have fabricated a new device with annular gap control over a range of 50 to 70 μm using piezoelectric actuators. This has enabled us to obtain better aerodynamic performance when compared to the previous design (2× more vacuum) and also more reproducible results. This is allowing us to study a broader experimental space than the previous design which is critical in guiding future directions. This work also presents and explains the principles behind a fractional factorial design of experiments methodology for testing a large number of experimental parameters in an orderly and efficient manner to understand and optimize the critical parameters that lead to obtain improved detection limits while minimizing the number of experiments performed. Preliminary results showed that several folds of improvements could be obtained for certain condition of operations (up to 34 folds). 相似文献
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Aliphatic or aromatic N,N-disubstituted nitrosamine was generated in fair to excellent yield from the reaction of a secondary or tertiary amine with o-iodoxybenzoic acid (IBX) or o-iodosylbenzoic acid (IBA)/R(4)NX (X = halide) and nitromethane. The product yield was strongly influenced by both the halide of R(4)NX and iodanes. IBX gave a higher yield than IBA, while the halides follow F(-) > Cl(-) > Br(-) ~ I(-). Nitrous acid formed in situ from nitromethane and IBX (or IBA)/halides is likely responsible for the observed reaction. 相似文献
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JPC – Journal of Planar Chromatography – Modern TLC - A new quantitative densitometric HPTLC method has been developed for analysis and determination of the stability of anastrozole,... 相似文献
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Single crystals of the title compound, obtained from a melt after reacting intimate mixtures of BaCO3 and In2O3 at 840 °C (12 h), belong to the monoclinic space group P21/a with Z=16. 相似文献
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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献
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