Due to "Russification" of the university, Kobert left Dorpat in 1896, subsequently becoming director of the Brehmerschen Heilanstalten (a sanatorium founded decades earlier by Hermann Brehmer) in Gorbersdorf. In 1899 he was appointed to the chair of pharmacology, pharmacognosy, chemistry and physiological history of medicine at the University of Rostock, a position he kept until his death.
Kobert's work largely involved investigations of ergot alkaloids, scopolamine, saponins and various plant and animal poisons. He was the author of popular textbooks, and was especially known for his release of Historischen Studien aus dem Pharmakologischen Institut der Universität Dorpat (Historical studies in the Institute of Pharmacology at the University of Dorpat; 5 volumes 1889–96).
Compendium der praktischen Toxikologie zum Gebrauche für praktische Ärtze und Studierende, 1894 - Compendium of practical toxicology and numerous other particulars for physicians and students.
"Practical toxicology for physicians and students"; translated and edited by Ludwig Heinrich Friedburg. New York, W. R. Jenkins (1897)
Beiträge zur Kenntnis der vegetabilischen Hämagglutinine : eine auf Veranlassung der Königl. Bayerischen Akademie der Wissenschaften ausgeführte und durch Verleihung des Liebigstipendiums unterstützte Experimentaluntersuchung , Vol. 1–2, 1913 Digital edition by the University and State Library Düsseldorf
