Millen, Raptes & White
Process for producing citric acid by fermentation
 Process for manufacturing citric acid by aerobic culture of yeast strains in a medium containing at least one n-paraffin, comprising adding to the culture medium, after the phase of exponential growth thereof, a nitrogenous heterocyclic organic compound selected from .alpha.-picolinic acid, 2,6-dipicolinic acid, quinaldic acid, bi-pyridine, orthophenanthroline, 8-hydroxyquinoline and 5-hydroxyquinoxaline, at a concentration from 0.5 to 10 g/liter, and controlling the pH value of said medium during said growth phase by addition of sodium or potassium carbonate. 
Institut Francais du Petrole, des Carburants et Lubrifiants et Entreprise de Recherches et d'Activities Petrolieres Elf
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Paul Georges Jean-Max
Maldonado Glikmans Charpentier