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Analytical Chemistry

Standard

Aflatoxin B1

(1162-65-8)
Aflatoxin B1 is the major analogue of a family of bisfuranocoumarin mycotoxins produced by Aspergillus flavus and related species. Aflatoxin B1 exhibits a distinctive UV spectrum and blue fluorescence. Aflatoxins are among the most potent mycotoxins known but are in fact "pre-toxins", requiring metabolic activation to the toxic principle. Aflatoxins are found widely in nature in trace amounts, particularly in grains and nuts. The toxicity of these metabolites was first recognised in the 1950s an

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3,4-Dihydro-3-(4-hydroxyphenyl)-2H-1-benzopyran-7-ol

(94105-90-5)
A human urinary metabolite of Daidzein.It is also a natural estrogenic metabolite from soy isoflavones.

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Ammelide

(645-93-2)
A related compound of Melamine.

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(+)-Mecoprop

(16484-77-8)
ChEBI: The (R)-enantiomer of 2-(4-chloro-2-methylphenoxy)propanoic acid; the active stereoisomer of the racemic herbicide mecoprop.

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butyl 2-[4-(4-cyano-2-fluoro-phenoxy)phenoxy]propanoate

(122008-78-0)
Cyhalofop(Cyhalofop acid) is a recently registered herbicide from the aryloxyphenoxy propionate group in India to control a wide range of grass weed species at various growth stages in rice crop.

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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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