Water and temperature relations of growth and ochratoxin A production by Aspergillus carbonarius strains from grapes in Europe and Israel

Journal of Applied Microbiology
D MitchellN Magan

Abstract

This study investigated the in vitro effects of water activity (a(w); 0.85-0.987) and temperature (10-40 degrees C) on growth and ochratoxin A (OTA) production by two strains of Aspergillus carbonarius isolated from wine grapes from three different European countries and Israel on a synthetic grape juice medium representative of mid-veraison (total of eight strains). The synthetic grape juice medium was modified with glycerol or glucose and experiments carried out for up to 56 days for growth and 25 days for OTA production. The lag phase prior to growth, growth rates and ochratoxin production were quantified. Statistical comparisons were made of all factors and multiple regression analysis used to obtain surface response curves of a(w) x temperature for the eight strains and optimum growth and OTA production by A. carbonarius. The lag phase increased from <1 day at 25-35 degrees C and 0.98 a(w) to >20 days at marginal temperatures and water availabilities. Generally, most A. carbonarius strains grew optimally at 30-35 degrees C, regardless of solute used to modify a(w), with no growth at <15 degrees C. The optimum a(w) for growth varied from 0.93 to 0.987 depending on the strain, with the widest a(w) tolerance at 25-30 degrees ...Continue Reading

References

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Citations

Mar 1, 2007·Mycotoxin Research·M Schmidt-Heydt, R Geisen
Dec 8, 2005·Food Additives and Contaminants·Kevin Jørgensen
Dec 8, 2005·Food Additives and Contaminants·Naresh Magan, David Aldred
May 1, 2010·Toxins·Luís AbrunhosaArmando Venâncio
Aug 7, 2010·Food Microbiology·Daiana GarciaSonia Marín
May 14, 2010·International Journal of Food Microbiology·Stella M RomeroGraciela Vaamonde
Apr 24, 2010·International Journal of Food Microbiology·Maria Gougouli, Konstantinos P Koutsoumanis
Sep 8, 2009·International Journal of Food Microbiology·M L ChiottaS N Chulze
Jan 29, 2008·International Journal of Food Microbiology·Pascal ClouvelPierre Martin
Jan 2, 2007·International Journal of Food Microbiology·Salma LasramAbdelwahed Ghorbel
Dec 2, 2011·Journal of the Science of Food and Agriculture·Esther García-CelaSonia Marin
Nov 19, 2005·Chemico-biological Interactions·Diana RingotYvan Larondelle
Sep 26, 2006·International Journal of Food Microbiology·Ana ValeroSonia Marín
Jun 2, 2006·International Journal of Food Microbiology·P BattilaniN Magan
May 12, 2006·International Journal of Food Microbiology·N BellíM R Bragulat
May 19, 2006·International Journal of Food Microbiology·R SerraA Venâncio
May 23, 2006·International Journal of Food Microbiology·S L LeongE S Scott
May 23, 2006·International Journal of Food Microbiology·P BattilaniA Logrieco

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