منابع مشابه
Gas Chromatography I. Retention, Efficiency and Resolution Purpose
Purpose In this experiment you will examine the effect of temperature on retention in isothermal gas chromatography, and use this information to determine the heat of solution of the solute in the stationary phase and to determine the temperature for optimum retention. You will also examine the effect of flow rate on efficiency and construct a van Deemter plot, and determine the flow rate for o...
متن کاملGas Chromatography
Capillary GC Columns and Guard Columns/ Retention Gaps 2 How to Choose a Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Columns by Phase Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Ionic Liquid Columns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 MS-Grade Columns . . . . . ...
متن کاملCharacterization of biological active compounds from Verbascum phlomoides by chromatography techniques. I. Gas chromatography
The extracts, decoctions and infusions of Verbascum, commonly known as “mullein”, have been used in traditional medicines for centuries in almost all parts of the world. In this paper, a screening of two different extracts of Verbascum phlomoides flowers originating from the Southeast region of Romania is presented. The content of total phenolics and flavonoids from extracts were determined. Al...
متن کاملSulfur Compounds: Gas Chromatography
(tetrahydrofuran) at 703C for 16 h. The ester residue is then converted to a 6,6-dideuteriohexose residue, the O-methyl ethers of which are easily distinguishable by GC-MS of the derived alditol acetates. An alternative to acid hydrolysis that is applicable to most polysaccharides and glycoconjugates, including those containing acid-labile residues or glycosidic linkages resistant to hydrolysis...
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ژورنال
عنوان ژورنال: Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi)
سال: 1968
ISSN: 0015-6426,1882-1006
DOI: 10.3358/shokueishi.9.455