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AMB Express. 2012; 2: 12.
Published online 2012 February 15. doi:  10.1186/2191-0855-2-12
PMCID: PMC3293749

Recombinant bromelain production in Escherichia coli: process optimization in shake flask culture by response surface methodology


Bromelain, a cysteine protease with various therapeutic and industrial applications, was expressed in Escherichia coli, BL21-AI clone, under different cultivation conditions (post-induction temperature, L-arabinose concentration and post-induction period). The optimized conditions by response surface methodology using face centered central composite design were 0.2% (w/v) L-arabinose, 8 hr and 25°C. The analysis of variance coupled with larger value of R2 (0.989) showed that the quadratic model used for the prediction was highly significant (p < 0.05). Under the optimized conditions, the model produced bromelain activity of 9.2 U/mg while validation experiments gave bromelain activity of 9.6 ± 0.02 U/mg at 0.15% (w/v) L-arabinose, 8 hr and 27°C. This study had innovatively developed cultivation conditions for better production of recombinant bromelain in shake flask culture.

Keywords: bromelain, Escherichia coli BL21-AI, face centered central composite design, induction.

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