تأثير الأشعة فوق البنفسجية UV-C في نمو الفطر Aspergillus flavus المعزول من حشرة خنفساء الطين الحمراء Triboliumcastaneum و إنتاج الافلاتوكسينات

Abstract EN

The present study was carried out in order to evaluate the efficiency of UV-C on the growth of the fungi Aspergillus flavus which was isolated from different instars of Tribolium castaneum in addition to its effect on the production of aflatoxin by the fungi the results showed the following When A.flavus exposed to different periods (2, 4, 8, 16, 24 and 32 min) of times to UV-C 254 nanometer wave length the radial growth of the fungi was reduced significantly as time of exposure was increased from 2 to 32 min being the lowest radial growth of the fungi was 1.12 cm after six day from time of exposure to UVC for 32 min as compared with 8.42 cm in the control one (p>0.05).

When HPLC technique used to detect the presence of aflatoxine produced by the fungi it was found that the rate of producing this kind of toxin was reduced significantly when A.flavus exposed to different periods of UV-C the lowest rate was zero (under detection limit) when A.flavus exposed to UV-C for 32 min in comparison to 2.6 ppm in the control one.