Barend Coenraad Petrus Jansen
Jansen began in 1904 at the University of Amsterdam to study chemistry, which he completed in 1909. In 1909 he was a scientific assistant in the physiological institute headed by Professor Gerard Abraham van Rijnberk. Through his work at the Institute Jansen developed his interest in biochemistry, particularly in digestion. On July 10, 1912 received his doctorate from the University of Utrecht with Pieter van Romburgh with a thesis on carbon dioxide. Jansen developed an early interest on the relationships between chemistry and physiology. 1913 acquired Jansen in Utrecht PhD in chemistry, which allowed him to work as a lecturer in biochemistry at the University of Amsterdam. There he worked 1915 on the urea synthesis.
Since many colleagues of Jansen 's career moved in the following years due to the Dutch East India, he followed them 1917. He went to Batavia, now the Indonesian capital of Jakarta. There, he became head of the medical laboratories of a pharmacy and came into contact with Willem Frederik Donath and Gerrit Grijns. In 1919 he became the head of the pharmaceutical-chemical department of the central laboratory in Weltevreden. In 1926 he isolated together with Donath the crystalline form of vitamin B1 from rice bran and gave him the name antineuritisches vitamin (short Aneurin ).
A year before he returned to the Netherlands in 1928, he received in 1927 a call from the newly constructed Medical College, later University in Batavia. There he became professor of chemistry. In 1928 he returned to the Netherlands and was Professor of Physiological Chemistry at the University of Amsterdam, which he held until 1954.
He died on 18 October 1962, 79 years of natural causes.