Karenko Valeria Alexandrovna RussiaSaratovSSU. Institute of Chemistry., 410012, Saratov, Astrakhanskaya str., 83, building. 1, Institute of Chemistry, SSUkulapinaeg@mail.ru Author's articles Determination of the Main Substances in the Preparations of Cephalexin and Cefuroxime Axetil Research of a State of Some the Cephalosporin Antibiotics in Water Environments by Spectrophotometry Potentiometric Sensors for Determination of Cefepime in Water and Biological Environments