نتایج جستجو برای: Non-volatile components

تعداد نتایج: 1691054  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1391

in this work, a novel and fast method for direct analysis of volatile compounds (davc) of medicinal plants has been developed by holding a filament from different parts of a plant in the gc injection port. the extraction and analysis of volatile components of a small amount of plant were carried out in one-step without any sample preparation. after optimization of temperature, extraction time a...

Journal: :iranian journal of pharmaceutical sciences 0
mohammad hassanzadeh khayyat department of medicinal chemistry, faculty of pharmacy, and pharmaceutical sciences research center, mashhad university of medical sciences, mashhad, iran sayyed ahmad emami department of pharmacognosy, faculty of pharmacy, and biotechnology research center m. rahimizadeh department of chemistry, faculty of sciences, ferdowsi university, mashhad, iran bibi seddigheh fazly-bazzaz department of medicinal chemistry, faculty of pharmacy, and pharmaceutical sciences research center, mashhad university of medical sciences, mashhad, iran j. assili adepartment of pharmacognosy, faculty of pharmacy, and biotechnology research center,

the essential oils obtained from fresh fruits and terminal branchlets with adherent leaves of cupressus sempervirens l. cv. cereiformis rehd. growing in iran, were analyzed by gc-ms, and screened for bacteriostatic and fungistatic activities. thirteen components were identified in the essential oils. the main constituents of both fruits and leaves were ?-pinene, æ-3-carene, ?-terpenyl acetate a...

Journal: :journal of food biosciences and technology 0

abstract: a combined gas chromatography-mass spectrometry (gc-ms) with headspace solid-phase micro extraction (spme) method has been employed for the analysis of the flavor volatiles of three different rice cultivar, including two modified iranian rice cultivars and hashemi rice cultivar during gelatinization. the proposed combination provided a powerful system for easy and rapid screening of a...

Journal: :International Journal of Food Properties 2018

ABSTRACT: A combined gas chromatography-mass spectrometry (GC-MS) with headspace solid-phase micro extraction (SPME) method has been employed for the analysis of the flavor volatiles of three different rice cultivar, including two modified Iranian rice cultivars and Hashemi rice cultivar during gelatinization. The proposed combination provided a powerful system for easy and rapid screening of a...

2014
John A. Pickett Stephen Barasa Michael A. Birkett

The interaction between volatile and non-volatile, e.g. proteinaceous, components of pheromone and other semiochemical-based signalling systems presents a daunting set of problems for exploitation in the management of vertebrates, good or bad. Aggravating this is the complexity of the mixtures involved with pheromones, not only by definition associated with each species, but also with individua...

Journal: :Clinica chimica acta; international journal of clinical chemistry 1985
D N Buchanan J G Thoene

We present a procedure for the profiling of the volatile carboxylic acids and neutral compounds in blood or urine using the direct injection of the acidified sample into a gas chromatograph interfaced with a mass spectrometer by a jet separator. The non-volatile components remain at the head of the SP-1000 column while the volatile components move through the column. Up to sixty physiological s...

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