A Zafarzadeh, N Amanidaz, N Seyedghasemi,
Volume 8, Issue 3 (8-2014)
Abstract
Abstract
Background and Objective: Safe drinking water is essential for health and health promotion is dependent on providing safe water. We aimed to determine the relationship between turbidity & residual chlorine and microbial quality of drinking water in Agh ghala.
Material and Methods: In this descriptive-analytical study, 2079 water samples were collected from water networks of 78 villages and urban network using census sampling during two years. Both sampling and tests were performed on the basis of standard methods.
Results: In more than 96 percent of the villages (N =75), above 90% of the samples hadn’t any fecal coliform bacteria except three villages that had the index in the range of 85 to 88 percent. Residual chlorine had significant relationship with coliform and fecal coliform (P ≤ 0.05) while the relationship between turbidity and coliform contaminants, fecal coliform and residual chlorine was not significant.
Conclusion: Total coliform and fecal coliforms were reducing by increasing residual chlorine in the water supply networks. It has been suggested that the officials reduce the water turbidity and annual washing of the water network to increase the effect of residual chlorine and decrease bacterial contamination.
Keywords: Agh Ghalla, Fecal Coliform, Coliform, Residual Chlorine
Ghanadan, M, Akbari, N, Soltan Dallal, Mm,
Volume 8, Issue 5 (1-2015)
Abstract
Abstract Background and Objective: Cream, a rich dairy product, with a neutral PH and low preservation time is a suitable medium for microbial growth. Salmonella is one of the most important pathogens in causing food poisoning and human gastroenteritis. This study aimed at investigating the quality of traditional cream for the bacterial contamination. Material and Methods: In this cross-sectional study, 196 non-pasteurized cream samples were collected from 5 regions of Hamedan, Iran. After dilution in phosphate buffer and serial dilution preparation, Salmonella was transferred to Rappaport-Vassiliadis (RV) enrichment medium according to CDC guidelines. After 24 h incubation at 37 ° C, a loop was inoculated in MacConkey and Hektoen Enteric (HE) Agar. The suspected colony phenotype was examined and their identification confirmed by API-20 E. Results: The samples (29%) were contaminated with at least one kind of bacteria, Salmonella Spp (4.59%) and Yersinia Spp (2.55%). The other bacteria like Escherichia, Enterobacter, Klebsiella, and Citrobacter were also isolated. Nine samples were contaminated with two kinds of bacteria. Conclusion: The presence of bacteria such as Salmonella and Yersinia in unpasteurized cream indicates that more quality control needs to be applied to the traditional crème produced in the city by health control office of food products. Keywords: Cream, Salmonella SPP, Coliform, Yersinia Enterocolitica, Hamedan
