26 Enterobacteria like Escherichia coli generate formate, lactate, acetate and succinate as major 27 acidic fermentation products. Accumulation of these products in the cytoplasm would lead to 28 uncoupling of the membrane potential and therefore they must be either metabolized rapidly 29 or exported from the cell. E. coli has three membrane-localized formate dehydrogenases 30 (FDH) that oxidiz...

Introduction (Steinkraus 1995, 1996a, 1997) Fermented foods are food substrates that are invaded or overgrown by edible microorganisms whose enzymes, particularly amylases, proteases, lipases hydrolyze the polysaccharides, proteins and lipids to nontoxic products with flavors, aromas and textures pleasant and attractive to the human consumer. If the products of enzyme activities have unpleasant...

To improve the nutri-functional quality and, in particular, antioxidant capacity of corn by-products, fermentation with selected lactic acid bacteria was carried out. this purpose, white-1 and 2 yellow by-products were fermented then extracted. In all samples, process shows an improvement activity comparison to non-fermented by-products. It observed that by-product extracts have a higher conten...

Controlling antibiotic-resistant (ART) bacteria in cheese fermentation is important for food safety and public health. A plant-maintained culture was found to be a potential source for ART bacterial contamination in cheese fermentation. Antibiotics had a detectable effect on the ART population from contamination in the finished product. The decrease in the prevalence of antibiotic resistance (A...

We show that sweetening of food products by natural fermentation can be achieved by a combined metabolic engineering and transcriptome analysis approach. A Lactococcus lactis ssp. cremoris strain was constructed in which glucose metabolism was completely disrupted by deletion of the genes coding for glucokinase (glk), EII(man/glc) (ptnABCD), and the newly discovered glucose-PTS EII(cel) (ptcBAC...

Background: Table olives are nutritionally a complete food and considered as one of the oldest fermented products. This study aimed to evaluate the effect of Lactiplantibacillus plantarum 11 as a starter culture on the fermentation of table olives at two incubation temperatures 22 and 30 °C and different salt concentrations (0, 4, 8, and 12% m/v) of sodium chloride (NaCl). Methods: The ferment...

Dry lentils seeds are a good source of high quality protein, vitamins, and a balanced range of minerals. They are also an excellent source of complex carbohydrates and dietary fibres [1]. Lentil seeds, which are highly accepted in most parts of the world, provide one of the best means of fighting malnutrition among people in developing countries [2]. In several countries, reduction in the consu...

Products containing probiotic bacteria are gaining popularity, increasing the importance of their accurate speciation. Unfortunately, studies have suggested that improper labeling of probiotic species is common in commercial products. Species identification of a bank of commercial probiotic strains was attempted using partial 16S rDNA sequencing, carbohydrate fermentation analysis, and cellular...

Processes for the biotechnological production of kerosene and diesel blendstocks are often economically unattractive due to low yields and product titers. Recently, Clostridium acetobutylicum fermentation products acetone, butanol, and ethanol (ABE) were shown to serve as precursors for catalytic upgrading to higher chain-length molecules that can be used as fuel substitutes. To produce suitabl...

BACKGROUND The use of a multistarter fermentation process with Saccharomyces cerevisiae and non-Saccharomyces wine yeasts has been proposed to simulate natural must fermentation and to confer greater complexity and specificity to wine. In this context, the combined use of S. cerevisiae and immobilized Starmerella bombicola cells (formerly Candida stellata) was assayed to enhance glycerol concen...