Lo scopo di questo progetto è stato quello di capire i processi alla base delle risposta allo stress ossidativo nei batteri lattice. Questi batteri sono estensivamente usati nell'industria del cibo sia come starter sia come probiotici. Durante i processi industriali come anche durante la digestione questi batteri posso incontrare a diversi stress. Lo stress ossidativo è pericolo per i lab microaerofili sia per la sopravvivenza che per la stabilità genetica. Lactobacillus acidophilus è uno dei più usati nell'industria del cibo, per questo è stato stressato con differenti concentrazioni di H₂O₂ per simulare un ambiente ossidante. Le proteine sono state separate per 2D-gel elettroforesi e quelle con differenze in intensità sono state analizzate con spettrometria di massa con lo scopo di trovare informazioni per migliorare sia i ceppi che i processi industriali. La maggior parte delle proteine identificate sono correlate con il metabolismo energetico/dei carboidrati e stress.
The aim of this project is to understand which processes underlie the adaptation to oxidative stress in lactic acid bacteria (LAB). These bacteria are extensively used in food fermentation technologies and are recognized as probiotics since they can bring significant benefits to the human health. Unfortunately, many stresses during industrial processes or digestion process in the human body occur. Oxidative stress is dangerous for the microaerophilic LAB for both viability and genetic stability of the strains. Lactobacillus acidophilus is one of the most notable LAB in food technologies therefore, the strain NCFM was stressed with different concentrations of H₂O₂ to simulate an oxidative environment. Growth curves were built in order to collect data in different stages of growth for following protein analysis. Proteins were separated by 2D-gel electrophoresis and differentially expressed proteins were analyzed by mass spectrometry with the aim of providing data for either strains or industrial processes improvement. Identified proteins are mostly related with carbohydrate/energy metabolism and stress.
Analisi proteomica delle risposta allo stress ossidativo nei batteri lattici
CALDERINI, ELIA
2013/2014
Abstract
The aim of this project is to understand which processes underlie the adaptation to oxidative stress in lactic acid bacteria (LAB). These bacteria are extensively used in food fermentation technologies and are recognized as probiotics since they can bring significant benefits to the human health. Unfortunately, many stresses during industrial processes or digestion process in the human body occur. Oxidative stress is dangerous for the microaerophilic LAB for both viability and genetic stability of the strains. Lactobacillus acidophilus is one of the most notable LAB in food technologies therefore, the strain NCFM was stressed with different concentrations of H₂O₂ to simulate an oxidative environment. Growth curves were built in order to collect data in different stages of growth for following protein analysis. Proteins were separated by 2D-gel electrophoresis and differentially expressed proteins were analyzed by mass spectrometry with the aim of providing data for either strains or industrial processes improvement. Identified proteins are mostly related with carbohydrate/energy metabolism and stress.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.14240/68419