Peter Griess
Johann Peter semolina ( semolina also, born September 6, 1829 in Kirchhosbach, now part of Forest Kappel, † August 30 1888 in Bournemouth ) was a German chemist.
Life and work
Meal was one of those German chemist who made such as August Wilhelm von Hofmann or Ludwig Mond in the 19th century in England their luck. Last Johann Peter semolina worked as a brewery chemist of the famous brewery of Samuel Allsopp & Sons in Burton- upon- Trent.
After visiting a rural private school and higher vocational school in Kassel, and a short stint in a Hessian hussar regiment semolina wrote in 1850 at the University of Jena to switch in autumn 1851 at the University of Marburg. There he studied philology; He lived during this time when clothiers herring (WS 1851/52 ), the master mason Dauber (SS 1853) and the Municipal servants Cöster (WS 1853/54 ). Corp Student excesses and a concomitant relegation still finished his 1853 Marburg - stay, and brought him to the Ludwig -Maximilians- University of Munich; Here he heard, without having been enrolled, lectures by Justus von Liebig. In 1854 he returned back with ministerial approval and after settling a Karzerstrafe, to Marburg and studied chemistry in particular Hermann Kolbe; But he has not filed an academic audit. In 1856 he left to earn money the university. After his temporary place of work, the oehlersche factory in Offenbach am Main, was burned down, it drove him again to Marburg. His teacher Kolbe took care of him and recommended him for a job in 1858 with August Wilhelm (from) Hofmann at the London laboratory at the Royal College of Chemistry. His work on the aromatic diazo compounds on the basis of synthetic dyes, azo dyes ( see also tar color ) are prepared, and which he had already begun partly in Marburg, soon attracted the attention of gathered at the Royal Society of Chemistry professional colleagues on itself. So he asked the first diazo compound by introducing nitrous gases in Pikraminsäurelösung dar. 1858 Griess had found that you can generally produce diazonium salts by the action of nitrous acid on aromatic amines, without, however, to be located on the structure of these compounds clear. With a number of azo dyes prepared on this basis he started competing with other dye chemists of his time, such as Otto Nikolaus Witt and Carl Alexander von Martius. A lively and friendly exchange of ideas connected him over many years with the chemist Heinrich Caro, a director and board member of BASF.
The professional collaboration with the German chemist Heinrich Böttinger, a student of Hofmann, who was employed by Samuel Allsopp & Sons in Burton- upon- Trent, helped him to a position in life in the brewery. Also semolina ' wife, a doctor's daughter, came from this city. His new job forced him temporarily to abandon the hitherto familiar studies, but he found plenty of opportunity research direction developed by him to enrich new discoveries. For his scientific achievements, he was in personal attendance, appointed by the Faculty of Arts of the University of Munich in 1877 an honorary doctorate. In the field of azo dyes semolina had indeed applied for patents, as a researcher, he was not involved in the profits of dye production, however, was able to sell some of its patents. He also appeared as an expert witness on the suggestion of Caro in patent litigation for BASF.
Semolina was buried in Burton- upon- Trent.
Griess test
In medicine, Peter semolina has left its mark - named after him Griess test, evidence for nitrite. The substance is heated dry with MnO2 or Pb3O4, which develop HNO2 vapors which color -dampened filter paper Grieß'schem reagent red.
Grieß'sches reagent
A one percent solution of sulfanilic acid in 30 per cent acetic acid and a 0.1 - percent solution of naphthylamine are mixed together. Colors to a sample after addition of the reagent pink, then nitrite (NO2 - ) is proved.