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TitleResponse surface optimization of the medium components for the production of biosurfactants by probiotic bacteria
Author(s)Rodrigues, L. R.
Teixeira, J. A.
Oliveira, Rosário
Mei, Henny van der
Probiotic bacteria
Response surface methodology
Medium optimization
Experimental factorial design
Product yield
Issue dateJan-2006
JournalProcess biochemistry
Citation"Process biochemistry". ISSN 1359-5113. 41:1 (Jan. 2006) 1-10
Abstract(s)Optimization of the medium for biosurfactants production by probiotic bacteria (Lactococcus lactis 53 and Streptococcus thermophilus A) was carried out using response surface methodology. Both biosurfactants were proved to be growth-associated, thus the desired response selected for the optimization was the biomass concentration. The selected factors based on MRS medium for L. lactis 53 growth were peptone, meat extract, yeast extract, lactose, ammonium citrate and KH2PO4. For S. thermophilus A based on the M17 medium, the selected factors were peptone, meat extract, yeast extract, lactose, soya peptone and sodium glycerophosphate. The optimum MRS composition was found to be 38.6 g/l peptone, 43.0 g/l lactose, 10 g/l meat extract, 5 g/l yeast extract, 1.08 g/l Tween-80®, 2 g/l KH2PO4, 2 g/l CH3COONa, 2 g/l ammonium citrate, 0.2 g/l MgSO4•7H2O and 0.05 g/l MnSO4•4H2O. The optimized medium allowed a mass of produced biosurfactant (milligram per gram cell dry weight) 1.6 times higher compared to MRS standard medium. The optimum medium composition for growing S. thermophilus A consists of 5.0 g/l peptone, 5.7 g/l lactose, 5.0 g/l meat extract, 2.5 g/l yeast extract, 5.0 g/l soya peptone, 26.4 g/l sodium glycerophosphate, 0.5 g/l ascorbic acid and 0.25 g/l MgSO4•7H2O. With the optimization procedure a biosurfactant mass recovery 2.1 times higher was achieved. The application of response surface methodology resulted in an enhancement in biosurfactants production.
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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