No abstract is available for this article. more
To use all functions of this page, please activate cookies in your browser.
With an accout for my.bionity.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
Aims: The purpose of this study is to investigate the efficacy of continuous ohmic heating for reducing Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes in orange and tomato juice.
Methods and Results: Orange and tomato juice were treated with electric field strengths in the range of 25–40 V/cm for different treatment times. The temperature of the samples increased with increasing treatment time and electric field strength. The rate of temperature change for tomato juice was higher than for orange juice at all voltage gradients applied. Higher electric field strength or longer treatment time resulted in a greater reduction of pathogens. E. coli O157:H7 was reduced by more than 5 log after 60, 90, and 180 s treatment in orange juice with 40, 35, and 30 V/cm electric field strength, respectively. In tomato juice, treatment with 25 V/cm for 30 s was sufficient to achieve a 5 log reduction of E. coli O157:H7. Similar results were observed in S. Typhimurium and L. monocytogenes. The concentration of vitamin C in continuous ohmic heated juice was significantly higher than in conventionally heated juice (P < 0·05).
Conclusions: Continuous ohmic heating can be effective at killing foodborne pathogens on orange and tomato juice with lower degradation of quality than conventional heating.
Significance and Impact of Study: These results suggest that continuous ohmic heating might be effectively used to pasteurize fruit and vegetable juice in a short operating time and that the effect of inactivation depends on applied electric field strengths, treatment time and electric conductivity.
© 2012The Authors Journal of Applied Microbiology © 2012 The Society for Applied Microbiology
Abstract The single radial immunodiffusion assay has been the accepted method for determining the potency of inactivated influenza vaccines since 1978. The world‐wide adoption of this assay for vaccine standardisation was facilitated through collaborative studies that demonstrated a high ... more
Abstract Background Whether morbidity from the 1918‐19 influenza pandemic discriminated by socioeconomic status has remained a subject of debate for 100 years. In lack of data to study this issue recent literature have hypothesized that morbidity was “socially neutral”. Objectives ... more
Smart skin that can respond to external stimuli could have important applications in medicine and robotics. Using only items found in a typical household, researchers have created multi-sensor artificial skin that's capable of sensing pressure, temperature, humidity, proximity, pH, and air ... more
Some doctors may recommend that patients with the flu take acetaminophen, or paracetemol, to relieve their symptoms; however, a new randomized clinical trial found no benefits to the over-the-counter medication in terms of fighting the influenza virus or reducing patients' temperature or ot ... more
A new study that investigated the potential of certain psychological traits for predisposing heterosexuals to have negative attitudes towards homosexual people found that psychoticism - which is present in severe psychopathological conditions but may also contribute to less severe states of ... more