List of Articles Zohreh Mashak

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  1 - Predictive mathematical models for evaluation of Cuminum cyminum L. and temperature storage effect on Bacillus cereus in BHI broth
  Zohreh Mashak
  Bacillus cereus is a food-born pathogen that 20% of total outbreaks of food intoxication in the world are caused by Bacillus cereus. Nowadays there is an increasing interest in the use of plant-derived antimicrobial compounds as natural preservatives for foods. Cuminum More

  Bacillus cereus is a food-born pathogen that 20% of total outbreaks of food intoxication in the world are caused by Bacillus cereus. Nowadays there is an increasing interest in the use of plant-derived antimicrobial compounds as natural preservatives for foods. Cuminum cyminum L. is a plant native to Iran that is used in traditional medicine and food products. The aim of this survey is providing of predictive mathematically models for evaluation of antibacterial effect of Cuminum cyminum L. essential oil on Bacillus cereus in a multi-factorial system. The essential oil of Cuminum cyminum L. plant was obtained by steam-distillation and analyzed by GC/MS. Then, effects of different concentrations of Cuminum cyminum L. essential oil (0, 0.005, 0.015, 0.030 and 0.045%) and storage temperature (10, 25 and 35°C) were evaluated on growth of Bacillus cereus in BHI broth during at certain intervals (1, 2, 3, 4, 5, 6, 9, 12, 15, 18, 21 24, 27, 30, 36 and 42 days). The growth of Bacillus cereus was significantly decreased by 0.015% EO concentration incubated at 10°C storage temperature and 0.030% EO concentration incubated at 25 and 35°C storage temperature (p<0.05). The predictive mathematically models produced in this study can be a useful tool for evaluation of changes of this microorganism along of the food chain. Manuscript profile
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  2 - The effect of gamma rays on shelf life of grass carp (Ctenopharyngodon idella) fillet in the refrigerator condition
  reza shahhoseini Zohreh Mashak
  Various ways to increase the duration used for food storage, among whom radiation can be used as an effective way to retard spoilage in food in particular is concerned with the origin of the fish. In this study 50 grass carp (Grass carp) (Ctenopharyngodon idella) (mean More

  Various ways to increase the duration used for food storage, among whom radiation can be used as an effective way to retard spoilage in food in particular is concerned with the origin of the fish. In this study 50 grass carp (Grass carp) (Ctenopharyngodon idella) (mean weight 1-1.5 kg) for gamma irradiation with cobalt-60 source by doses of zero, 1.5, 2.5 and 3.5 kGy chosen and then change microbial load and total volatile nitrogen in the days 1, 7 and 14 were evaluated under the conditions of storage in refrigerator. These research results demonstrate the significant decline in aerobic mesophilic bacteria and T.V.N in the irradiated samples in comparison with non-irradiated samples. In this study, given that the dose of 3.5 kGy dose caused a significant decrease in comparison with other (standard range) T.V.N values and aerobic mesophilic bacteria was in the refrigerator until the seventh day. Therefore, in Grass carp using it (3.5kGy) as the best dose to prevent corruption is recommended in seventh days. Manuscript profile
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  3 - Antimicrobial effects of Chitosan films incorporating with Lavandula stoechas on some food-borne bacteria
  Zohreh Mashak سمیرا فیاض فر نرجس چراغی
  Today, application of natural antimicrobial films as an inhibitors of growth of dangerous microbes especially in food staffs have been increased. The present study was carried out in order to study the antimicrobial activity of chitosan films containing 1–4% (v &f More

  Today, application of natural antimicrobial films as an inhibitors of growth of dangerous microbes especially in food staffs have been increased. The present study was carried out in order to study the antimicrobial activity of chitosan films containing 1–4% (v ⁄ v) Lavandula stoechas essential oil (EO) on some food-borne pathogenic bacteria (Listeria monocytogenes, Bacillus cereus, Vibrio parahaemolyticus, Staphylococcus aureus and Escherichia coli O157:H7). At first, the essential oil of the Lavandula stoechas herb was prepared. The most essential components are 1,8 cineol (16/49%), borneol (75/10%), camphor (94/8%) and linalool L (95/3%) and alfa-pinene (2/3 %).Then Circular discs of chitosan films containing different concentration of Lavandula stoechas essential oil were placed on bacterial lawn. Chitosan films incorporated with 4% (v ⁄ v) of EO inhibited the growth of all tested pathogenic bacteria. Incorporation of Chitosan film with EO showed significant antimicrobial effects (P < 0.05). Transparency of film was reduced by increasing of EO. These results showed that Chitosan films containing Lavandula stoechas EO have good effect for packaging some foods. Manuscript profile
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  4 - The survey of microbial properties in commercial ready-to-eat foods at manufactures and hypermarkets in Alborz province
  Shima PourJafar Zohreh Mashak Mohsen Mirzaee
  Due to developing consumption of ready-to-eat food and influence of them on foodborne diseases, microbial changes in the various kinds of the foods at the factories and food markets in Alborz province were examined. For this purpose S.aureus bacteria, coliforms, E.coli, More

  Due to developing consumption of ready-to-eat food and influence of them on foodborne diseases, microbial changes in the various kinds of the foods at the factories and food markets in Alborz province were examined. For this purpose S.aureus bacteria, coliforms, E.coli, molds and yeasts, and bacterial total counts, in 200 samples of semi-cooked (falafel, fishfinger, fried-fish, fried-chicken, meat-cutlet, cordon-bleu, kookoo-sabzi, fried-shrimp, chicken nugget, schnysel chicken , schnysel forming) [A], frozen raw (chicken-kebab, frozen chicken arm, chicken burger, 30%hamburger, 60%hamburger, 75%hamburger, 85%hamburger, 85%finger kebab)[B], and cocked refrigerated (55%cocktail sausage, 55%hot dog, German sausage)[C] were studied. The amount of the bacteria after storage in the stores were more than the factories, in all groups (P≤0/05). Total bacterial count and coliforms, in the C group was less than other groups and between the A and B groups didn’t find any statistical difference. The C group didn’t contain the Escherichia coli, and it was higher in B group than A group. The highest and lowest molds and yeast were founded in B and A samples, respectively. The highest number of Staphylococcus aureus bacteria was related to the B group (P≤0/05). The increase of microbial changes in hyperstores compared to factories can indicate that ready to eat storage has done in abuse time-temperature conditions. In addition to the ecological characteristics of these microbes, cross-contamination by personnel manipulation, improper handling and transportation, undercooked cooking, (especially in semi-cooked food) and improper use of the freezing system can play a significant role in this microbial increase. Manuscript profile