Articolele autorului Dan Cristian Vodnar
Link la profilul stiintific al lui Dan Cristian Vodnar

Monitoring Lactic Acid Fermentation in Media Containing Dandelion (Taraxacum officinale) by FTIR Spectroscopy

Fourier-transform infrared (FTIR) spectroscopy is considered to be a comprehensive and sensitive method for detection of molecular changes in cells and media. In the present study, FTIR spectroscopy was employed as an easy, rapid and reliable technique to evaluate the lactic fermentation of Lactobacillus casei on a model de Man, Rogosa and Sharpe (MRS) medium with or without the addition of dandelion extract (DE). Dandelion, due to its high content

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Inhibition of Listeria monocytogenes ATCC 19115 on ham steak by tea bioactive compounds incorporated into chitosan-coated plastic films

Background The consumer demands for better quality and safety of food products have given rise to the development and implementation of edible films. The use of antimicrobial films can be a promising tool for controlling L. monocytogenes on ready to eat products. The aim of this study was to develop effective antimicrobial films incorporating bioactive compounds from green and black teas into chitosan, for controlling L. monocytogenes ATCC 19115

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Green tea increases the survival yield of Bifidobacteria in simulated gastrointestinal environment and during refrigerated conditions

Background: The well–known prebiotics are carbohydrates but their effects may not always be beneficial, as they can also encourage the growth of non-probiotic bacteria such as Eubacterium biforme and Clostridium perfringens. Therefore, new alternatives such as non-carbohydrate sources to stimulate the growth of probiotics are needed. The aim of this work was to evaluate (I) the green tea polyphenols by HPLC-LC/MS and (II) the protective effect

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HPLC Characterization of Lactic Acid Formation and FTIR Fingerprint of Probiotic Bacteria during Fermentation

Lactic acid production during growth of several probiotic bacteria (Lactobacillus plantarum, Bifidobacterium infantis, Lactobacillus casei, Bifidobacterium breve and mix of them) in model MRS media has been monitored using HPLC and the bacterial fingerprint was detected using FTIR. FTIR spectroscopy was able to fingerprint the bacteria identify specific markers located at 900-1300 cm-1 (carbohydrates and proteins, nucleic acids from DNA of bacteria),

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Morphology, FTIR fingerprint and survivability of encapsulated lactic bacteria (Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus) in simulated gastric juice and intestinal juice

Microencapsulation of bacteria in hydrocolloid beads is known as a potential way to enhance and protect their survivability in the digestive tract. We encapsulated a mix of two lactic bacteria (Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus) in sodium alginate (AG) and chitosan (CH) matrices. The morphological parameters of beads containing bacteria were comparatively measured. The FTIR fingerprint can discriminate the

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Lactic Acid Production by Lactobacillus paracasei 168 in Discontinuous Fermentation Using Lucerne Green Juice as Nutrient Substitute

The aim of this study was the utilization of lucerne green juice (LGJ), obtained in 2005 and 2008, as nutrient substitute in lactic acid fermentation using Lactobacillus paracasei 168, in a discontinuous fermentation process with the addition of 55 g/L glucose and 15 g/L yeast extract. The LGJ after pressing fresh green mass contains a series of nitrogen-containing compounds and inorganic salts that are essential for cell growth. The strain used,

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