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Quantitative assessment of the impact of the type of inoculum on the kinetics of cell growth, substrate consumption and pigment productivity by Penicillium purpurogenum GH2 in liquid culture with an integrated stochastic approach

Paper ID Volume ID Publish Year Pages File Format Full-Text
18838 43035 2015 11 PDF Available
Title
Quantitative assessment of the impact of the type of inoculum on the kinetics of cell growth, substrate consumption and pigment productivity by Penicillium purpurogenum GH2 in liquid culture with an integrated stochastic approach
Abstract

•Inoculum type had a great effect on the pigment production by P. purpurogenum GH2.•Production yield was significantly higher when using mycelium as inoculum.•Initial concentration of mycelium showed a point of optimum around 10% (v/v).•Probability distribution functions described integratedly bioprocess kinetics.

Natural ingredients are in demand and microbial processes to produce biocolourings are thus being developed. Penicillium spp. is particularly interesting for food applications. While microbial growth would be enhanced by using mycelium as inoculum, studies aimed at optimising pigments yields produced by Penicillium spp. have used spores as inoculum. A quantitative comparison of the pre-culture method for producing pigments by P. purpurogenum GH2 is provided in this work. Data analysis showed that simple growth models do not provide a suitable description of the fermentation process with mycelium as inoculum, which requires accounting for the effect of cell death. Probability density functions were applied to describe cell growth, substrate consumption and pigment production jointly and accurately. Specific production was 51% higher using mycelium as inoculum instead of spores, reaching a highest production of pigments with 10% (v/v) initial concentration being optimal (10.60 ± 0.40 units of Optical Density at 500 nm). Productivity of pigments per hour was 55% higher using mycelium as inoculum compared to spores. Three stochastic distributions provided equally good quantifications of all data (normal, gamma and Weibull). The three variables could be described by a same distribution function, with biomass being related to both live cells and accumulated dead residue.

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Keywords
Fermentation; Gamma distribution; Natural colourants; Normal distribution; Weibull distribution
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Quantitative assessment of the impact of the type of inoculum on the kinetics of cell growth, substrate consumption and pigment productivity by Penicillium purpurogenum GH2 in liquid culture with an integrated stochastic approach
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 96, October 2015, Pages 221–231
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us