Production of pantothenic acid and thiamine byAzotobacter vinelandiiin a chemically defined medium and a dialysed soil medium

摘要

The production of pantothenic acid and thiamine byAzotobacter vinelandiiwas studied in a chemically defined medium and a dialysed soil medium amended with different amounts of carbohydrate and NHinf4sup+. Pantothenic acid and thiamine were produced in large amounts in the culture medium containing 2.0–5.0 glucose and 0.1–0.3 NH4Cl. The results showed that the liberation of these vitamins was increased under adiazotrophic conditions and with an excess of C sou