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  • Author or Editor: J. Farkas x
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The treatise provides selected examples on the activities and main results of the research and development work during the first forty years of history of the Central Food Research Institute, Budapest.

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Oxidation in foods and beverages and antioxidant applications. Vols 1 & 2

E.A. Decker, R.J. Elias and D.J. McClements (Eds) Woodhead Publishing Ltd., Oxford, Cambridge, Philadelphia, New Delhi 2010, ISBN 978-1-84569-648-1; ISBN 978-84569-983-3, 408 and 528 pages.

Author: J. Farkas
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The paper reviews briefly the present status and future trends of some new, emerging food preservation technologies and anticipates the major lines of developments in relation to functional and transgenic foods. These topics of innovative food technologies and food products are of particular importance in view of the European Unions’s regulation concerning “novel foods and novel ingredients”. The author considers the obstacles and the needs for more research and other actions such as safety assessment and balanced communication to the public.

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Conductimetry as an alternative data capture method for following microbial growth has a great potential as a research tool of predictive microbiology. In spite of this fact there is only a limited number of applications using conductimetric data for model generation. In this study the growth of single strains of Listeria monocytogenes and Lactococcus lactis was tested in 5 media using a RABITinstrument. The goal of the work was to find selective growth media for Listeria and Lactococcus, respectively, in order to study their interaction in mixed-culture using the conductimetric technique. Whitley Anaerobic broth, Whitley Impedance broth and modified Whitely Impedance broth (Whitley Impedance broth + Chloramphenicol 7 mg l &1) were not suitable for following selectively the growth of Lactococcus lactis or Listeria monocytogenes in a mixed culture of the two bacteria. BiMedia 630 A for Lactococcus lactis and Bimedia 403 A for Listeria monocytogenes satisfied the demands raised by conductance measurement. Linear correlations were established between the graphically estimated TTD values of the conductance curves and the logarithmic numbers of colony forming units (CFU). The correlations were very strong in each case (determination coefficients (R 2) of the linear regression were higher than 0.98 at both medium-strain combinations). However, in BiMedia 630 Listeria monocytogenes was capable of slow growth, therefore, this medium would be feasible for studying microbial interactions if only low concentrations of Listeria (less than 10 6 CFU ml &1) were present in the mixed culture.

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