نتایج جستجو برای: gc and gc ms

تعداد نتایج: 16844927  

Journal: :research journal of pharmacognosy 0
m. babashpour-asl department of horticultural sciences, university campus 2, university of guilan, rasht, iran. research center for pharmaceutical nanotechnology, faculty of pharmacy, tabriz university of medical sciences, tabriz, iran. h. nazemiyeh research center for pharmaceutical nanotechnology, faculty of pharmacy, tabriz university of medical sciences, tabriz, iran. h. zakizadeh department of horticultural sciences, university campus 2, university of guilan, rasht, iran. a. motallebi-azar department of horticultural sciences, faculty of agriculture, tabriz university, tabriz, iran.

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...

Journal: :progress in biological sciences 2014
mohammad ali tajick hamideh seid mohammad khani valiollah babaeizad

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 ...

Journal: :Journal of chromatography. A 2006
Maya Kochman Alexander Gordin Tal Alon Aviv Amirav

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...

Journal: :Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi) 1992

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه محقق اردبیلی - دانشکده علوم 1393

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...

Journal: :iranian journal of pharmaceutical research 0
maryam amirahmadi 1- department of pharmacology and toxicology, school of pharmacy, shahid beheshti university of medical sciences, tehran, iran. 2- food and drug laboratories research center, ministry of health and medical education, tehran, iran. 3- food and drug control laboratories, food and drug deputy, ministry of health and medical education, tehran, iran. hassan yazdanpanah 1- department of pharmacology and toxicology, school of pharmacy, shahid beheshti university of medical sciences, tehran, iran. 2- food and drug laboratories research center, ministry of health and medical education, tehran, iran. shahram shoeibi 1- food and drug laboratories research center, ministry of health and medical education, tehran, iran. 2- food and drug control laboratories, food and drug deputy, ministry of health and medical education, tehran, iran. morteza pirali-hamedani 1- food and drug laboratories research center, ministry of health and medical education, tehran, iran. 2- food and drug control laboratories, food and drug deputy, ministry of health and medical education, tehran, iran. 3- department of pharmacology, school of pharmacy, tehran university of medical sciences, tehran, iran. mahsa ostad gholami 1- food and drug laboratories research center, ministry of health and medical education, tehran, iran. 2- food and drug control laboratories, food and drug deputy, ministry of health and medical education, tehran, iran. mohammad farshid mohseninia 1- food and drug laboratories research center, ministry of health and medical education, tehran, iran. 2- food and drug control laboratories, food and drug deputy, ministry of health and medical education, tehran, iran.

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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