In order to effectively improve the oxygen transfer rate in the microbial production of natamycin, the effect of several oxygen vectors on Streptomyces gilvosporeus biomass and natamycin production was studied. The results showed that oxygen vectors and surfactants could not be used as carbon source although they were useful to improve dissolved oxygen and transfer rate, as well as the production of natamysin. The yield of natamycin could be improved by 56.8%, 59.5% and 72.5% after adding 6% soybean oil, 6%...