Growth optimization of a probiotic candidate,<Emphasis Type="Italic">Bifidobacterium pseudocatenulatum</Emphasis> G4, in milk medium using response surface methodology |
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Authors: | W Stephenie B M Kabeir M Shuhaimi M Rosfarizan A M Yazid |
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Institution: | (1) Department of Food Service and Management, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;(2) Department of Microbiology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;(3) Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia |
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Abstract: | Bifidobacterium pseudocatenulatum G4, a wild strain isolated from infant stools that has previously exhibited probiotic characteristics, was used in this study.
The aim of this research was to improve the growth potential of this strain in milk-based medium. An initial screening study
using a 23 full factorial design was carried out to identify the impact on biomass production of the various components of the medium
which were skim milk, yeast extract, and glucose. Statistical analysis suggested that yeast extract had a significant positive
effect on viable cell count whereas glucose had a negative effect. Response surface methodology (RSM) was then applied to
optimize the use of skim milk and yeast extract. A quadratic model was derived using a 32 face-centered central composite design to represent cell mass as a function of the two variables. The optimized medium composition
was found to be 2.8% skim milk and 2.2% yeast extract, w/v. The optimized medium allowed a maximum biomass of 9.129 log10 cfu/mL, 3.329 log units higher than that achieved with 10% skim milk, which is the amount commonly used. The application
of RSM resulted in an improvement in the biomass production of this strain in a more cost-effective milk medium, in which
skim milk use was reduced by 71.8%. |
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Keywords: | bifidobacteria medium milk optimization probiotic RSM |
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