scholarly journals Production of a nisin Z/pediocin mixture by pH-controlled mixed-strain batch cultures in supplemented whey permeate

1999 ◽  
Vol 86 (3) ◽  
pp. 399-406 ◽  
Author(s):  
F. Goulhen ◽  
J. Meghrous ◽  
C. Lacroix
Keyword(s):  
Whey Permeate ◽  
Batch Cultures ◽  
Nisin Z ◽  
Ph Controlled

scholarly journals In vitrofermentation of commercial α-gluco-oligosaccharide by faecal microbiota from lean and obese human subjects

2012 ◽  
Vol 109 (11) ◽  
pp. 1980-1989 ◽  
Author(s):  
Shahrul R. Sarbini ◽  
Sofia Kolida ◽  
Glenn R. Gibson ◽  
Robert A. Rastall
Keyword(s):  
Human Subjects ◽  
Gas Production ◽  
Batch Cultures ◽  
Significant Difference ◽  
Bacterial Enumeration ◽  
Faecal Bacteria ◽  
Obese Human ◽  
Bacterial Groups ◽  
Ph Controlled

The fermentation selectivity of a commercial source of α-gluco-oligosaccharides (BioEcolians; Solabia) was investigatedin vitro. Fermentation by faecal bacteria from four lean and four obese healthy adults was determined in anaerobic, pH-controlled faecal batch cultures. Inulin was used as a positive prebiotic control. Samples were obtained at 0, 10, 24 and 36 h for bacterial enumeration by fluorescentin situhybridisation and SCFA analyses. Gas production during fermentation was investigated in non-pH-controlled batch cultures. α-Gluco-oligosaccharides significantly increased theBifidobacteriumsp. population compared with the control. Other bacterial groups enumerated were unaffected with the exception of an increase in theBacteroides–Prevotellagroup and a decrease inFaecalibacterium prausnitziion both α-gluco-oligosaccharides and inulin compared with baseline. An increase in acetate and propionate was seen on both substrates. The fermentation of α-gluco-oligosaccharides produced less total gas at a more gradual rate of production than inulin. Generally, substrates fermented with the obese microbiota produced similar results to the lean fermentation regarding bacteriology and metabolic activity. No significant difference at baseline (0 h) was detected between the lean and obese individuals in any of the faecal bacterial groups studied.

High-End pH-controlled delivery of glucose effectively suppresses lactate accumulation in CHO Fed-batch cultures

2011 ◽  
Vol 108 (6) ◽  
pp. 1328-1337 ◽  
Author(s):  
Matthew Gagnon ◽  
Gregory Hiller ◽  
Yen-Tung Luan ◽  
Amy Kittredge ◽  
Jordy DeFelice ◽  
...  
Keyword(s):  
Controlled Delivery ◽  
Fed Batch ◽  
Batch Cultures ◽  
Lactate Accumulation ◽  
Ph Controlled

scholarly journals Development of a Continuous System for 2-Phenylethanol Bioproduction by Yeast on Whey Permeate-Based Medium

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7388
Author(s):  
Karolina Drężek ◽  
Joanna Kozłowska ◽  
Anna Detman ◽  
Jolanta Mierzejewska
Keyword(s):  
Dairy Products ◽  
Kluyveromyces Lactis ◽  
Oxygen Demand ◽  
Value Added ◽  
Continuous System ◽  
Culture Broth ◽  
Whey Permeate ◽  
Batch Cultures ◽  
A Value ◽  
Space Time Yield

2-Phenylethanol (2-PE) is an alcohol with a rosy scent and antimicrobial activity, and therefore, it is widely used in the food and cosmetic industries as an aroma and preservative. This work was aimed to draw up a technology for 2-PE bioproduction on whey permeate, which is waste produced by the dairy industry, rich in lactase and proteins. Its composition makes it a harmful waste to dispose of; however, with a properly selected microorganism, it could be converted to a value-added product. Herein, two yeast Kluyveromyces marxianus strains and one Kluyveromyces lactis, isolated from dairy products, were tested for 2-PE production, firstly on standard media and then on whey permeate based media in batch cultures. Thereafter, the 2-PE bioproduction in a continuous system in a 4.8 L bioreactor was developed, and subsequently, the final product was recovered from culture broth. The results showed that the yield of 2-PE production increased by 60% in the continuous culture compared to batch culture. Together with a notable reduction of chemical oxygen demand for whey permeate, the present study reports a complete, effective, and environmentally friendly strategy for 2-PE bioproduction with a space-time yield of 57.5 mg L−1 h−1.

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