Laboratory reagents properties

The aldehyde group of aldoses can either be oxidized or reduced and ketoses can be reduced. The best laboratory reagent for reduction is sodium boro-hydride which acts rapidly in neutral aqueous solutions (see Eq. 4-2). Since both NaB H4 and NaB H4 are available, radioactive or heavy isotope labels can be introduced in this way. The aldehyde groups can be oxidized by a variety of agents to the corresponding aldonic acids, a fact that accounts for the reducing properties of these sugars. In alkaline solution aldoses reduce Cu + ions to cuprous oxide (Eq. 4-3), silver ions... 

EURACHEM Guide on Validation, 1998 [14] Reference material RM can be virtually any material used as a basis for reference, and could include laboratory reagents of known purity, industrial chemicals, or other artifacts. The property or analyte of interest needs to be stable and homogenous but the material does not need to have the high degree of characterisation, traceability and certification more properly associated with CRMs. 

Properties White to light-buff powder. Stable in aqueous solution, mp 182-188C. Combustible. Use Dyestuff intermediate, laboratory reagent. 

Workers at NIST and elsewhere have used cells without liquid junctions to study primary-standard buffers extensively. Some of the properties of these buffers are discussed in detail elsewhere. Note that the NIST buffers are described by their molal concentrations (mol solute/kg solvent) for accuracy and precision of preparation. For general use, the buffers can be prepared from relatively inexpensive laboratory reagents for careful work, however, certified buffers can be purchased from the NIST. 

Deoxycholate, a bile acid, is abundant in the bile of some mammals. It is widely used as a laboratory reagent, to solubilize membrane proteins, due to its detergent properties. 

With As, Sb, and Se, both Specpure and Laboratory Reagent Grade materials were used. No difference was observed in the surface properties of the two sets of samples. With Bi a Specpure and with Te a Laboratory Reagent Grade sample was used. 

The utility of the 2-diethylaminoethyl ethers of insoluble polysaccharides is well established in the field of ion-exchange chromatography, and so such compounds as 0-( 2-diethylaminoethyl) cellulose and 0-(2-diethylaminoethyl) cross-linked dextran (DEAE-Sephadex) are common laboratory reagents for fractionations. The preparation, properties, and uses of 0-(2-diethylaminoethyl)-, 0-[2-(triethylammonium)-ethyl]-, and 0-(2-aminoethyl)-cellulose have been reviewed. Modification of the reaction conditions originally employed for diaminoethylation... 

All metals in the periodic table form nitrates, M(N03) c. Nitrate is a common anion. Many nitrates occur in nature. These are widely used in industry, and many are common laboratory reagents. Nitrates are salts of nitric acid. Their hazardous properties vary widely. The toxicity of nitrates depends exclusively on the metal cation part of the molecule. 

Because n-heptane must be extremely pure for use as the standard zero in the testing of motor fuels for motor octane number, it is available for use as a pure solvent. In practice, such a grade is seldom used except as a laboratory reagent. Narrow boiling range petroleum cuts primarily consisting of n- and isoalkanes have solvent properties similar to n-heptane and are very much less expensive. Repeated recovery may result in the more volatile compounds not being stripped completely from solutions but the overall solvent and volatility properties of recovered solvent... 

CAS 9045-22-1 EINECS/ELINCS 232-681-7 Definition Lithium salt of heparinic acid Properties Wh. powd. sol. in water Uses Anticoagulant in medical devices laboratory reagent Manuf/Distrib. CarboMer http //www.carbomer.com] Fluka http //www.sigma-aidrich.com] Sigma Trade Name Synonyms SPL Heparin Lithium [Scientific Protein Labs http //www.spi-pharma.com]... 

Laboratory reagents, preparation of, 8-1 to 4 Laboratory Solvents and Other Liquid Reagents, 15-13 to 22 Laguerre polynomials, A-83 to 85 Lanthanum see also Elements electrical resistivity, 12-39 to 40 electron configuration, 1-18 to 19 heat capacity, 4-135 history, occurrence, uses, 4-1 to 42 ionization energy, 10-203 to 205 isotopes and their properties, 11-56 to 253 magnetic susceptibility, 4-142 to 147 molten, density, 4-139 to 141 physical properties, 4-133 to 134 thermal properties, 12-201 to 202 vapor pressure, 6-61 to 90 vapor pressure, high temperature, 4-136 to 137... 

In general, reagent-based selection is much faster and more convenient to execute in the laboratory as compared with the product-based selection. On the other hand, the latter strategy usually provides more accurate results. There exists a potential to combine both approaches to achieve more optimal results, particularly in the case of large exploratory virtual combinatorial libraries, for which mass random synthesis and screening are not economically feasible. In this article, we demonstrated the usefulness of property-based approach for selection of optimal GPCR ligands. 

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