Dear list,

has anybody experience with carbon and nitrogen isotopes (natural
abundance) in caffeine? If there is any variation, are there isotopic
signatures of different sources?

A quick look at the literature (PubMed) gave no results.

Many thanks in advance, and ...

        ... happy new year to everyone!!!

        Uli Flenker
        Institute of Biochemistry
        German Sports University Cologne
        Carl-Diem-Weg 6

        50933 Cologne / Germany

        Phone 0049/0221/4982-493