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 about a particular compound. To simplify identification and retrieval, the Chemical Abstracts Service (CAS) assigns a unique identifier known as the CAS number. This number serves as a reliable reference point for chemical substances, regardless of their various names. The CAS Registry Number, or simply CAS number, is a unique numeric identifier assigned by the Chemical Abstracts Service, a division of the American Chemical Society. It is used to accurately identify chemical compounds, polymers, biological sequences, mixtures, and alloys. The CAS number is essential in chemical databases, allowing researchers to efficiently search for information on substances that may have multiple naming conventions. CAS numbers are structured in three parts separated by hyphens. The first part typically contains 2 to 6 digits, the second part has 2 digits, and the third part is a single check digit used to verify the validity of the number. For example, the CAS number for water (H₂O) is 7732-18-5. The check digit is calculated using a specific algorithm: each digit in the first two parts is multiplied by its position (starting from 1), summed up, and then divided by 10. The remainder becomes the check digit. This ensures accuracy and helps prevent errors in data entry. It's important to note that different isomers of the same molecule will have distinct CAS numbers. For instance, D-glucose has a CAS number of 50-99-7, while L-glucose is 921-60-8. Similarly, alpha-D-glucose is assigned 26655-34-5. Some enzymes and complex molecules also have CAS numbers; for example, alcohol dehydrogenase has the CAS number 9031-72-5. Even mixtures, such as mustard oil, are given a CAS number—8007-40-7 in this case. As of December 25, 2005, the CAS database contained over 27 million substances, with new entries being added at a rate of more than 4,000 per day. This growing collection makes the CAS number an indispensable tool for scientists, researchers, and professionals working in the chemical industry. Whether you're looking up a compound’s properties, safety data, or synthesis methods, the CAS number provides a standardized way to access accurate and reliable information.

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