نتایج جستجو برای: gc ms
تعداد نتایج: 145754 فیلتر نتایج به سال:
Although gas chromatography–triple quadrupole mass spectrometry (GC-MS/MS) has been applied to the determination of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) in various food samples, there is insufficient evidence evaluate its equivalence with chromatography–high resolution (HRMS). In present study, two GC-MS/MS instruments different ion sources (advanced electron ionization [EI] a...
Identifying non-annotated peaks may have a significant impact on the understanding of biological systems. In silico methodologies have focused on ESI LC/MS/MS for identifying non-annotated MS peaks. In this study, we employed in silico methodology to develop an Isotopic Ratio Outlier Analysis (IROA) workflow using enhanced mass spectrometric data acquired with the ultra-high resolution GC-Orbit...
Gas chromatography mass spectrometry (GC-MS) is a widely used central analytical technology. Commercially available GC-MS systems use different types of mass analyzers such as Quadrupole, Ion Trap and/or Time of Flight, but practically all systems utilize the same Nier type electron ionization (EI) ion source and the same standard GC-MS transfer-line interface. Consequently, the various GC-MS v...
the composition of the essential oils of teucrium chamaedrys l. belongs to the family lamiaceae, it is growing wild in the margin of mountainous roads of arid and cold climate of north iran. in this research, essential oils of t. chamaedrys, extracted and measured at the different location by different methods of distillationand then were analyzed by gc and gc/ms. investigation and comparison o...
مقدمه: در کشور ایران تعداد 58 گونه از این جنس رویش دارد که 17 گونه از این تعداد بومی ایران می باشد. گیاهان متعلق به این جنس دارای خواص دارویی بوده ودر طب سنتی استفاده می شوند. هدف: شناسایی اجزای تشکیل دهنده اسانس گونه مریم گلی گل درشت و بررسی فعالیت ضدباکتری آن. روش بررسی: در این تحقیق گونه مریم گلی گل درشت از محل رویش خود در دره مارمیشو ارومیه جمع آوری شد. اسانس گیری به روش تقطیر با آب انجام ش...
مقدمه: جنس بومادران از تیره آفتابگردان2 شامل حدود 115 گونه در سراسر جهان می باشد. در کشور ایران 19 گونه از این جنس رویش دارد که دارای خواص دارویی بوده و در طب سنتی مورد استفاده قرار می گیرند. هدف: بررسی اجزای تشکیل دهنده اسانس گل و برگ گونه بومادران تماشایی (achillea nobilis l. subsp. neilreichii) می باشد. روش بررسی: در این تحقیق گونه بومادران تماشایی3 از محل رویش خود واقع در روستای داماش، شرق ...
background: to study the chemical constituents and larvicidal activity of essential oil extracted from the leaves of coccinia grandis against three mosquito species. methods: essential oil was extracted by hydro distillation using clevenger apparatus and was analyzed for chemical constituents by gas chromatography-mass spectrophotometry (gc-ms). larvicidal activity was recorded after 12 and 24h...
in this study, the essential oil obtained by hydrodistillation of the seeds of vitex pseudo-negundo (verbenaceae), growing wild in sabzevar, khorasan razavi province, iran, were analyzed by gc and gc/ms. the yield of total volatiles was 0.8% (w/w). thirty-seven compounds representing 92.4% of the seed oil were identified. the main components of the oil were hexadecanoic acid (8.0%), elemol (7.0...
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