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Chemical Methods in Gas Chromatography by V. G. Berezkin

By V. G. Berezkin

During this two-part monograph, the writer describes glossy equipment for the swift column liquid chromatography of excessive- and medium-molecular-weight compounds of organic foundation, i.e. proteins, peptides, enzymes, nucleic acids, poly- and oligonucleotides, poly- and oligosaccharides, complicated biopolymers and biooligomers comparable to viruses, bacteriophages, ribosomes and glycoconjugates, in addition to another compounds corresponding to immunomodulators. the fabric is contained in components: half A facing basic chromatographic concept, rules, fabrics and methods; and half B facing the separation of person compound periods and containing a check in of chromatographed ingredients and a full-title bibliography. not just is that this a really good, certain treatise on chromatographic options, it additionally supplies a large, balanced assessment of swift separation of all recognized vital biopolymers and biooligomers, either basic and intricate, and in addition of a few synthetically ready and pharmaceutically vital biooligomers. furthermore, it presents an creation to the appliance of HPLC to the examine of the constitution of those elements.

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The tap is opened only when the liquid is removed with a syringe. , ref. 6). The methods and equipment used in the analysis of inorganic substances are less PRE-TREATMENT OF' SAMPLES 42 1 0 A Fig. 21. Vial reactor used in the CFD method. 1 = Container for liquid; 2 = stopper; 3 = rubber packing; 4 = tap; 5 = syringe. A, open vial reactor: B , closed vial reactor. From ref. 6 . conventional. As an example we shall consider a technique applied t o determine germanium in oxides, ores and alloys [113].

The distribution coefficients for isobutene and butene-1 in METHODS USED TO OBTAIN DERIVATIVES FOR GC u 0 1 2 3 4 0 1 2 3 45 4 Tlrne (min) Fig. 24. 4 pg). From ref. 118. 9, respectively. The content of the sample components was determined, using a non-polar stationary phase on which these compounds are not separated, with an accuracy of rt 6% [ 119,1201. Another example is the method of determining the degree of branching in polyethyleneimine (PEI) [12 1J . The method is based on the cyanoethylation of the primary and secondary amino groups in PEI.

2] octane-lcarboxylic acid (internal standard). Reprinted with permission from ref. 77. Fig. 11. Dependence of the ester yield on duration of reaction. Reprinted with permission from ref. 77. ceeds to completion. ). It is usually possible to reduce the duration of chemical reactions by using already known regularities. Let us cite some examples. In the work of Sizova et al. f741, devoted to the analysis of lower organic acids, the acids were preesterified with ethanol. Derivatives of the sample acids have to be formed, mainly because the direct chromatographic determination of formic acid is greatly hampered by the interaction of the acid with metallic parts of the chromatograph [75].

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