CAS coding introduction and rule ELISA kit

Chemical substances often have multiple names, including trade names, common names, chemical names, and synonyms. This can lead to confusion when searching for information. To simplify the process, the Chemical Abstracts Service (CAS) assigns a unique identifier known as the CAS number. This number serves as a universal reference for identifying chemical compounds, making it easier to retrieve accurate information from various databases. The CAS Registry Number, also called the CAS number, is a unique numeric identifier assigned by the CAS, a division of the American Chemical Society. It is used to distinguish chemical substances that may have several different names. A CAS number can represent compounds, polymers, biological sequences, mixtures, or alloys. It consists of three parts separated by hyphens, with no inherent meaning other than being a unique identifier. The CAS system was created to address the challenge of multiple naming conventions in chemistry. By assigning a single number to each substance, researchers and professionals can efficiently search for chemical data across global databases. As of December 25, 2005, the CAS database had registered over 27 million substances, with more than 4,000 new entries added daily. This ongoing growth highlights the importance of the CAS number in modern scientific research. A typical CAS number follows a specific format: the first part contains 2 to 6 digits, the second part has 2 digits, and the third part is a single check digit. The check digit ensures the accuracy of the number. The calculation involves multiplying each digit (except the last one) by its position, summing the results, and taking the remainder when divided by 10. For example, the CAS number for water (H₂O) is 7732-18-5. The check digit is calculated as follows: (8×1 + 1×2 + 2×3 + 3×4 + 7×5 + 7×6) mod 10 = 105 mod 10 = 5. It's important to note that isomers, enzymes, and mixtures all have distinct CAS numbers. For instance, D-glucose has a CAS number of 50-99-7, while L-glucose is 921-60-8. Even different forms of the same molecule, like alpha-D-glucose, have separate identifiers such as 26655-34-5. Enzymes, such as alcohol dehydrogenase, are also assigned CAS numbers—like 9031-72-5. Mixtures, such as mustard oil, also receive unique CAS numbers, such as 8007-40-7. This system helps ensure clarity and precision in chemical identification and data retrieval.

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