Effect of water activity and temperature on growth and ochratoxin production by three strains of Aspergillus ochraceus on a barley extract medium and on barley grains.
RAMOS, A.J., LA BERNIA, N., MARIN, S., SANCHIS, V. and MAGAN, N.
International Journal of Food Microbiology 44: 133 – 140.
1998
บทคัดย่อ
The effects of water activity (ax), temperature, time and their interactions on the growth of Aspergillus ochraceus on a barley extract agar medium and barley grains and on ochratoxin production on barley grains was studid. For the three A.ochraceus isolates examined, optimal aw levels for growth on agar media were in the range 0.98 – 0.96, with temperature optima of 30oC for the other isolate. Maximum amounts of ochratoxins were produced at the highest aw treatment (0.98 aw) and after 3 weeks incubation at 25 – 30oC. The range of ochratoxin concentrations varied considerably, from 1.7 to 12,949 mg/kg, depending on the aw and temperature interactions.