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Summary The study of recovery of an extracellular alkaline protease from fermentation broth produced by Norcadiopsis sp, was carried out with liquid–liquid extraction through sodium di-(2-ethylhexyl) sulphosuccinate/isooctane reversed micelles systems and aqueous two-phase systems (polyethylene glycol/potassium phosphate). The best conditions for extraction and back-extraction with the reversed micelles...