Paper Electrophoresis in the Identification of Writing Inks. Comparison with Horizontal Paper Chromatography

Paper Electrophoresis in the Identification of Writing Inks--Comparison with Horizontal Paper Chromatography

The identification of barbiturates by paper chromatography.

B ECAUSE barbiturates are relatively easily available and much used drugs, specimens from suspected cases of poisoning are frequently submitted to the laboratory for routine chemical examination. Since their urinary excretion begins early (because they are quickly absorbed), they can often be identified 1-2 hours after administration. The specimen of choice for examination is therefore the urin...

Study of phenylketonuria by paper chromatography

Paper Electrophoresis

sites on the polysaccharide using simple sugars as prospective inhibitors. Although much discussion is given to this topic, a really critical evaluation of the method as it is applied would have been welcome. As if overcome by long hours of work in purifying and assaying, the members of the conference several times lapse into rather unrewarding philosophical speculation on the question of wheth...

Analysis of writing inks on paper using direct analysis in real time mass spectrometry.

Ink analysis is central to questioned document examination. We applied direct analysis in real time mass spectrometry (DART MS) to ballpoint, gel, and fluid writing ink analysis. DART MS acquires the mass spectrum of an ink while it is still on a document without altering the appearance of the document. Spectra were acquired from ink on a variety of papers, and the spectrum of the blank paper c...