Scientists from Europe and the United States have determined which amino acids contained in the shells of eggs of titanosaur age of about 80 million years. Set and the state of the molecules suggests that during this period all peptides (chains of amino acids), which theoretically could remain in the shell, was to degrade. In favor of the same point of view I say experimenting with subfossile remains, where part of the tissue does not have time to turn into a fossil. This casts doubt on the findings of these peptides remains of dinosaurs that were made earlier. Preprint available on the website bioRxiv.org.
Biological polymers decompose rather quickly. Therefore, no solid DNA and RNA or proteins in the remains of dinosaurs that are 65 million or more years (we’re not talking here about birds, although technically they are dinosaurs too), can not find work. One of the oldest protein molecules that have been extracted from the remains of animals (specifically ostrich eggs), less than 4 million years.
However, in scientific magazines periodically publish articles about what the fossils is presented dinosaur discovered parts of the proteins — short chains of amino acids called peptides. Misleading even about fragments of very specific molecules — collagens in the remains of tyrannosaurs (68 million years) and the hadrosaurs (78 million years). This is really one of the most persistent protein, but they have little chance to survive for such a long time. The problem is in the fact that the short “strings” of protein molecules from different species can be the same, so to determine their origin is nearly impossible these peptides dinosaurs fail to distinguish from biological contamination by the peptides of modern birds.
Therefore, paleontologists and chemists from several European and American laboratories led Christy Pinkman (Kirsty Penkman) from York University (UK) analyzed using high performance liquid chromatography (HPLC), which amino acids contained in the fossils available to them — the shells of eggs of titanosaur age of about 80 million years, and compared the obtained data with a set of amino acids in the artificially aged modern shell eggs, supposititiously-shelled ostrich eggs by the age of 3.8 million years, and a lid shell snail bithinia, which was about 30 million years. Except HPLC was used Romanovsky spectroscopy and pyrolytic gas chromatography with mass spectrometry.