Notre groupe organise plus de 3 000 séries de conférences Événements chaque année aux États-Unis, en Europe et en Europe. Asie avec le soutien de 1 000 autres Sociétés scientifiques et publie plus de 700 Open Access Revues qui contiennent plus de 50 000 personnalités éminentes, des scientifiques réputés en tant que membres du comité de rédaction.
Les revues en libre accès gagnent plus de lecteurs et de citations
700 revues et 15 000 000 de lecteurs Chaque revue attire plus de 25 000 lecteurs
Eugene Jansen, Piet Beekhof, Johannes Cremers and Reinskje Talhout
The presence of ammonia in tobacco is an important factor for the absorption of nicotine, and for product taste. The determination of ammonia in tobacco is usually performed by ion chromatography with conductivity detection devices.
Here a new method is presented to measure the concentration of ammonia in tobacco based on an automated enzymatic method. This method is easy to perform and can be used on routine clinical analyzers. The enzymatic ammonia determination showed an intra-assay and inter-assay variation of 4-7 and 5-8%, respectively as determined with 3 brands of cigarettes. A comparison with the established HPLC-IC method gave similar results with respect to both concentrations in cigarettes and the reproducibility of the method. In one working day 50-60 samples of cigarettes or tobacco can be processed and analyzed.