Leila Goudarzi; Roha Kermanshahi
Abstract
Lactobacillus spp are a group of gram-positive, non-spore forming, cocci or rod shaped, catalase negative organisms that benefit to the host. prebiotics are non-digestible food ingredients that stimulate the growth and /or activity of bacteria in the digestive system in ways claimed to be beneficial ...
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Lactobacillus spp are a group of gram-positive, non-spore forming, cocci or rod shaped, catalase negative organisms that benefit to the host. prebiotics are non-digestible food ingredients that stimulate the growth and /or activity of bacteria in the digestive system in ways claimed to be beneficial to health. this study was conducted in order to investigate the effects of selected probiotic microorganisms in combination with prebiotics, on a growth or activity of proteus mirabilis. in this study the antimicrobial activity of five probiotic lactobacillus spp. (Lactobacillus acidophilus(atcc 4356), Lactobacillus Plantarum (ATCC 8014), Lactobacillus Fermentum (PTCC 1638), Lactobacillus Casei (PTCC 1608) And Lactobacillus Rhamnosus (PTCC 1637)) And Combination of probiotic and prebiotics (synbiotic) (Lactobacillus Spp. + five prebiotics : inulin, , trehalose , raffinose, lactulose and riboflavin) tested for their antimicrobial activity against proteus mirabilis (atcc 7002 and ptcc 1076) growth with agar well diffusion (awd) method. results showed that Lactobacillus Spp. had more antimicrobial activity against proteus spp., followed by inulin, , trehalose , raffinose , lactulose in comparison to basic mrs media (p
Ameneh Nasr; Roha Kermanshahi; Iraj Nahvi
Abstract
Abstract
Food preservatives are often added to food as preservation method. Mostly one preservative alone cannot preserve a product effectively. So it is required to create a preservation system to overcome limitations derived from each preservative. Using proper selection of different preservatives ...
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Abstract
Food preservatives are often added to food as preservation method. Mostly one preservative alone cannot preserve a product effectively. So it is required to create a preservation system to overcome limitations derived from each preservative. Using proper selection of different preservatives may lead to significant practical benefits. In this investigation, resistant strain of Bacillus cereus isolated from pizza cheese containing sodium citrate as a preservative was used to study its sensitivity to different chemical and biological preservatives. The MIC and MBC values of preservatives were measured. Results showed that this bacterium is resistant to permitted concentrations of sodium benzoate, sorbic acid, sodium citrate, potassium sorbate and acetic acid. The sensitivity of this strain was not different from Bacillus cereus PTCC1015.
It was realized that citric and benzoic acids (0.187% and 0.006% respectively), sorbic and propionic acids (0.0018% and 0.156% respeetively), propionic acid and potassium sorbate (0.019% and 0.019% respectively), sodium benzoate and propionic acid (0.026% and 0.019% respectively), citric acid and potassium sorbate (0.375% and 0.625% respectively), nisin and propionic acid (125 IU/ml and 0.156% respectively) had synergistic effect on Bacillus cereus.
Keywords: Bacillus cereus, Resistant, Preservatives, Synergism, Food
