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Analytical Chemistry

Standard

Benzo[ghi]fluoranthene

(203-12-3)
Yellow needles with greenish-yellow fluorescence (recrystallized from petroleum ether); blue fluorescence in solution.

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Thiochrome

(92-35-3)
Thiochrome, a natural oxidation product and metabolite of thiamine, is a selective M4 muscarinic receptor of acetylcholine (ACh) affinity enhancer. Thiochrome has neutral cooperativity with ACh at M1 to M3 receptors[1][2].

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Pentabromoethylbenzene

(85-22-3)
2,3,4,5,6-Pentabromoethylbenzene is a solid of high bromine content (80 wt %) with a melting point of 136-138°C and a decomposition temperature of ca 210°C. The compound is prepared by the Friedel-Crafts-catalyzed bromination of ethyl benzene in an inert solvent. Its manufacturers recommends its use in epoxy resins, ABS and urethane foams.

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In the analysis work, it is often necessary to use a compound of good quality and accurate content, which is used as a comparison for detection control, or used to calibrate the instrument. This compound is called a standard. Or standard. The standard product refers to the standard substance used to determine the potency of biological products. The production department must provide the standard product expressed in units (μ) of its potency when it is approved as a quality standard for biological products. According to the application, the standard products for inspection can be divided into biological standard products for biological verification of biological products, endocrine drugs, antibiotics and so on.
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