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NUTRITIVE VALUE OF PROPIONIBACTERIA AND LACTOSE-FERMENTING YEAST GROWN IN WHEY (1977)

SKUPIN, J. ; PEDZIWILK, F. ; GIEC, A. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Journal of food processing and preservation 1 (1977), S. 0

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ISSN: 1745-4549

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Process Engineering, Biotechnology, Nutrition Technology

Notes: The nutritive values of propionic acid bacteria (Pb) grown in whey media as mixed cultures and as a 2-stage fermentation with a lactose-fermenting yeast (Y-Pb) were determined.Yields were 14 g of cells per liter for Pb cultures and 16 g/liter for Y-Pb fermentations. When the fermentation medium and cells were dried together, total solids equalled 28 g/liter. The BOD of the whey was reduced over 90% in both fermentations. Adequate yields of vitamins, particularly B12, were obtained in both fermentations. The in vitro enzymatic digestibility of the cultures was increased by mechanical disruption of cells; however, this cell breakage did not affect Biological Value (BV). The essential amino acid composition was equal to or better than the FAO Standard Reference Protein. The BV of the Y-Pb was 25% higher than Pb and 10–40% higher than other microbial cell masses, including Torula yeast, commercial yeast and BP yeast from n-paraffin.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1745-4549.1977.tb00323.x

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Modeling cell concentration in complex media (1978)

Alford, J. S.

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 20 (1978), S. 1873-1881

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ISSN: 0006-3592

Keywords: Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: A model that continuously predicts the concentration of microorganisms in complex medium fermentations is suggested. The model uses carbon dioxide evolution as its primary input and assumes that respiration activity can be differentiated into growth-related and maintenance-related functions. This model can be programmed on computer-coupled vessels and used to standardize on a physiological fermentation inoculum transfer time. The cell concentration estimate can also be used to calculate specific growth rate and can be combined with additional monitored information to calculate other important fermentation parameters such as specific oxygen uptake.

Additional Material: 3 Ill.