نتایج جستجو برای: gc and gc ms
تعداد نتایج: 16844927 فیلتر نتایج به سال:
background and objectives: many members of the amaryllidaceae are regarded as toxic. the toxic constituents that occur in the whole family are referred to as the amaryllidaceae alkaloids. the main aim of this study was the identification of alkaloid compounds from galanthus transcaucasicus fomin, a medicinal plant from amaryllidaceae. methods: planar and column chromatography techniques were us...
microorganisms are important components of soil. some soil filamentous fungi such aspenicilium produce many bioactive small molecules, or secondary metabolites, that range frombeneficial bioactive compounds to harmful toxins. in this study, the metabolites of threepenicillium species (p. goditanum, p. moldavicum and p. corylophilum) were extracted byadding ethyl acetate to liquid cultures. the ...
A new approach of flow modulation comprehensive two-dimensional gas chromatography-mass spectrometry (GC x GC-MS) with supersonic molecular beam (SMB) and a quadrupole mass analyzer is presented. Flow modulation uniquely enables GC x GC-MS to be achieved even with the limited scan speed of quadrupole MS, and its 20 ml/min column flow rate is handled, splitless, by the SMB interface. Flow modula...
جنس saliva بیش از 900 گونه در جهان دارد. این جنس متعلق به خانواده lamiaceae می باشد. اسانس گونه های زیادی از این جنس شناسایی شده است. فعالیت های ضد قارچی، ضد میکروبی و . . . از اسانس این جنس گزارش شده است. اکثر گونه های این جنس دارای خواص دارویی هستند و بر همین اساس در این تحقیق 3 گونه ی saliva، از جمله، s. sclarea. s. syriaca، s. virgataa بررسی و ترکیبات اسانس آن ها شناسایی شد. اسانس گل آذین...
a reliable, rapid and accurate method based on spiked calibration curves and direct sample introduction was developed for determination of 17 pesticide residues in rice by gas chromatography-mass spectrometry single quadrupole selected ion monitoring gc/ms-sq-sim. sample preparation is based on extraction with acetonitrile without clean up. the use of spiked calibration curves for constructing ...
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