A tracer which only differs in isotopic composition from the substance to be traced.
ChEBI ID: 35206
| Member | Definition | Class | Studies | Trials |
|---|---|---|---|---|
| argon-39-atom | A trace radioisotope of argon with atomic mass of 38.964313 and a half-life of 269 years. | argon atom | 1 | 0 |
| methacetin-(methoxy-(13)C) | A (13)C-modified compound that is methacetin which has (13)C as the predominant isotope of the methoxy carbon. In normal subjects, methacetin is rapidly metabolised in the liver, being dealkylated by hepatic CYP1A2 to give paracetamol (acetaminophen); the methyl of the methoxy group is eliminated as CO2. Administering methacetin-(methoxy-(13)C) to a patient enables the liver (cytochrome P-450 1A2) function to be determined quickly and precisely by measuring the (13)CO2 in the breath (e.g. by isotope-selective non-dispersive infrared spectrometry (NDIRS)). | (13)C-modified compound; | 0 | 0 | |
| Studies | Pre-1990 | 1990's | 2000's | 2010's | Post-2020 |
|---|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 0 | 1 |