جستجوی مقالات مرتبط با کلیدواژه « microbial quality » در نشریات گروه « دامپزشکی »

Cheddar cheese is a hard type of cheese. It is coated traditionally by a special wax. Commercial coating materials which are used for coating are non-edible as a result they are undesirable due to environmental pollution and allergies caused in some consumers. Today, biodegradable films are receiving more attention. In this study, the effect of edible coating of basil seed mucilage containing zinc oxide nanoparticles (ZnO-NP) in three levels of zero, 0.25 and 0.5% on the quality properties of cheddar cheese was investigated during ripening for 90 days. The results of experiments showed that at the end of ripening, the highest amount of salt and fat and the lowest amount of moisture were related to the sample with mucilage coating containing 0.5% of ZnO-NP. Also, during ripening, in all samples the number of non-starter lactic acid bacteria increased, but the number of starter bacteria increased first and then decreased (p < 0.01). Also, in all treatments, the total number of mesophilic aerobic bacteria, Pseudomonas, mold and yeast increased significantly during storage, which was the lowest in samples with coating containing ZnO-NP (p < 0.01). In addition, ZnO-NP coatings prevented mold growth on the surface of cheddar cheese samples. According to the results obtained of this study, basil seed mucilage containing 0.5% ZnO-NP can be used as a coating in cheddar cheese without any adverse effect on the flavor of cheese.

Microbial contamination of confectionery products can cause types of gastrointestinal infections in consumers. The aim of this research was the assessment of microbial quality in dry confectionaries which marketed in Birjand city. For this purpose, at different times, a total of 100 samples of dry confectioneries were collected randomly under sterile conditions, based on the number of confectionery stores in different regions of the city and tested according to the reference and national standard methods. The statistical analysis of the data showed that the rate of contamination with Enterobacteriaceae and coliforms was more significant than standard limits in 8% and 13% of the samples, respectively, and none of them were infected with Escherichia coli. Also, 35% of the samples contained mold& yeast, but in 15% of them, the rate of contamination was higher than the standard limits. The results of this survey showed that a total of 19% of the samples were unusable due to excessive microbial contamination, so more precautionary measures should be taken in the processes of production, storage, and delivery of this product.