The use of a rapeseed oil emulsion feed, produced by a phase inversion temperature (PIT) process, produced more biomass, gave a 3-fold increase in oil utilisation and a higher oxytetracycline titre but a higher residual oil concentration when compared to a conventional fed-batch Streptomyces rimosus process fed with crude rapeseed oil. Importantly, microbial utilisation of the surfactant was confirmed for the first time.
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