Table 2
Mean OTA values detected in the samples, percent reduction, residual value, temperature and roasting time.
Temperature
and roasting time
Sample types Mean OTA
concentration (mg/kg)
Standard deviation OTA reduction Residual value
Green coffee without inoculation 5.41 e e
Inoculated green coffee 108.33 e e
205 C in 13.5 (min) Light roast/fine particle size 47.41 1.97 56.25% 43.77%
Light roast/medium particle size 40.78 1.07 62.36% 37.64%
Light roast/coarse particle size 28.24 3.60 73.93% 26.07%
217 C in 14 (min) Medium roast/fine particle size 16.81 1.04 84.48% 15.52%
Medium roast/medium particle size 10.75 0.69 90.01% 9.93%
Medium roast/coarse particle size 8.43 0.89 92.22% 7.78%
224 C in 14 (min) Dark roast/fine particle size 4.97 0.18 95.41% 4.59%
Dark roast/medium particle size 3.73 0.36 96.55% 3.44%
Dark roast/coarse particle size 3.06 0.16 97.17% 2.83%
The results of the levels of ochratoxin A are the average of 3 replicates.