Afrooz Saadatzadeh, Akhtar Alsadat Mir Saeed Ghazi, Sahar Sabahi,
Volume 21, Issue 147 (May 2024)
Abstract
The presence of heavy metals such as arsenic, cobalt, cadmium, lead and mercury in canned food is of great importance from the point of view of their toxicity and nature, and it covers a wide range of food. The presence of these metals in canned products is sometimes the source of the food, the type of can or the possibility of corrosion of the inner body of the used can is attributed. Therefore, the purpose of this study was to measure and compare the concentration of heavy metals in canned food (strong acid, acid, low acid). In order to analyze the data, descriptive statistics methods were used to compare the mean and difference between the data, the one-way multivariate variance measurement and the Kolmogorov-Smirnov test were used to ensure the normality of the data and if there was a significant difference between the data , then Tukey's test was performed to separate the data. The results of this research showed that the average concentration of heavy metals was in the order of lead > mercury > cobalt > arsenic > cadmium, and among the available metals, lead with a total average of 0.2670 ± 0.019723 mg/ kg had the highest value and cadmium had the lowest value with an average of 0.0028±0.0049. Compared to international standards and other studies, all metals except lead were lower than the maximum value. Although the concentration of these metals in canned food samples was acceptable but it is necessary to pay attention to the factors that increase the presence of these metals in canned goods in order to control them and achieve a high-quality product.
Afrooz Saadatzadeh, Reza Honarmand, Sahar Gholipour,
Volume 21, Issue 157 (March 2025)
Abstract
The purpose of this study was to investigate the activity of probiotic extract achieved from Lactobacillus casei against the growth of 4 standard drug-resistant bacterial strains and to compare its antimicrobial effect with some common antibiotics in vitro. L. casei was cultured in standard MRS medium and under anaerobic conditions. Probiotic dry extract was extracted after separating the mass of living cells by centrifugation and stabilized by lyophilization. The investigation of antimicrobial activity was done using the diffusion-disc method, the results were analyzed using SPSS software with a significance level of P<0.05. There was a significant difference between all antimicrobial agents (P<0.05). The findings showed that LPE was able to control resistant pathogenic bacteria. The highest inhibitory effect of LPE was evaluated against Staphylococcus aureus with a diameter of 26 mm of non-growth halo and on the other hand, the lowest effect was evaluated against Escherichia coli with a diameter of 13.3 mm of non-growth halo. Although LPE had the greatest effect compared to antibiotic agents against 3 bacterial strains, it was weaker than gentamicin and streptomycin in the case of Salmonella typhi. Despite the significant antibacterial effects of LPE against several strains of gram-negative and gram-positive bacteria, more studies are necessary before its clinical administration and to prove its beneficial role in the treatment of infectious diseases.
