In 1902 Delezenne became a member of the Société de biologie, in 1903 he was co-founder of the Bulletin de l'Institut Pasteur with Amédée Borrel (1867-1936), Félix Mesnil (1868-1938), Gabriel Bertrand (1867–1962), Alexandre Besredka (1870–1940) and Auguste-Charles Marie (1864-1935), and in 1910 became a professor at the Pasteur Institute.
He then went to the Pasteur Institute in Paris, where he studied organic bases and amino acids under Gabriel Bertrand.
This used an intermediate step of creating sorbose using an ingenious bacterial fermentation method discovered by a French researcher, Gabriel Bertrand.
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