الفهرس 
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Abstract
A thirty random samples of small and large scale romy cheese, (15 each) were collected from different retail stores and supermarkets in Sharkia Governorate, Egypt. A survey was conducted to determine the incidence of ochratoxin A by immune affinity column method and reading by VICAM fluorometer in parallel with standards of ochratoxin A.
It’s evident from the obtained results that all examined small and large scale romy cheese samples were contaminated with ochratoxin A by percentage of 100%.
The obtained results revealed the presence of ochratoxin A with mean values of 2.14 ± 0.31 and 2.05 ± 0.26 ppb in small and large scale romy cheese samples respectively.
Concerning small scale romy cheese samples, 7 (46.7%) samples out of examined samples were below 2 ppb while 8 (53.3%) samples were between 2-5 ppb.
In case of large scale romy cheese samples, 8 (53.3%) samples out of examined samples were below 2 ppb while 7 (46.7%) samples were between 2-5 ppb. All examined small and large scale romy cheese samples were exceeding the permissible limits, according to Egyptian standards (2005) and European commission limits (2006) (Permissible Limit Nil), while according to limit established by JECFA (Joint FAO/WHO Expert Committee on Food Additives, 2001), all samples were below the permissible limit (10 ng/g).