CAS coding introduction and rule ELISA kit

Chemical reagents and other substances generally have a lot of names, such as trade names, aliases, chemical names, common names, etc., and various names are easily mixed. The CAS number assigns a number to each substance, which can make us Searching is more convenient.

The CAS Registry Number or CAS Number, also known as the CAS registration number, is the registration number for chemical substances produced by the Chemical Abstracts Service (CAS). This number is an important tool for searching information on chemical substances with multiple names. It is the 8 unique numeric identification number of a substance such as a compound, a polymer material, a biological sequence, a mixture or an alloy.

The CAS of the American Chemical Society is responsible for assigning a CAS number to each substance present in the literature. The purpose is to avoid the trouble of having multiple names for the chemical, making the retrieval of the database more convenient. Almost all chemical databases today are allowed to be retrieved using the CAS number. As of December 25, 2005, CAS has registered the latest data on 27,115,156 substances, and has also increased at a rate of more than 4,000 per day.

CAS number format: A CAS number is divided into three parts with a hyphen "-". The first part has 2 to 6 digits, the second part has 2 digits, and the third part has 1 digit as the check code. The CAS numbers are in ascending order and have no inherent meaning. The checksum is calculated as follows: the last digit of the CAS sequence number (first and second digits) is multiplied by 1, the second digit is multiplied by 2, and so on, and then all the products are added together. And divide by 10, the remaining number is the third part of the check code. For example, the first two parts of the CAS number of water (H2O) are 7732-18, then the check code = (8 × 1 + 1 × 2 + 2 × 3 + 3 × 4 + 7 × 5 + 7 × 6) Mod 10=105 mod 10=5. (mod is the remainder operator)

Isomers, Enzymes, and Mixtures: Different isomer molecules have different CAS numbers. For example, D-glucos has a CAS number of 50-99-7 and L-glucose is 921. -60-8, alpha-D-glucose is 26655-34-5. Occasionally, there is a class of molecules with a CAS number, such as a group of alcohol dehydrogenase (Alcohol dehydrogenase) CAS number is 9031-72-5. The CAS number of a mixture such as mustard oil is 8007-40-7.

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