Carbon-13 (13C)

Carbon-13 (13C) is one of stable isotope atom of carbon-12 (12C), it contains six protons and seven neutrons, and its atomic mass is 13. It makes up about 1.1% of all natural carbon on earth. Many organic compounds contain 13C, which can be used in different research areas, such as molecular structures, metabolomics, proteomics, etc.. It is best known for the 13C breast test. These containing carbon-13 compounds can be used as tracers and internal standards, etc.