Abstract
The global isotope abundance of natural organic compounds is determined by that of their precursors. A prerequisite for the formation of non-statistical intermolecular and intramolecular isotope distributions is the occurance of thermodynamic and kinetic isotope effects in irreversible and branched metabolic processes. This coincidence permits the interference of external factors like climatological conditions during biosynthesis, thus leading to corresponding modulations of isotope fractionations. The general principles of the in-vivo isotope discrimination are outlined and the individual properties of the different bioelements in this system are described. The results are discussed in regard to obtain maximum information about the origin and authenticity of a natural compound by multielement isotope analysis.
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