List of Articles Hosein motamedi

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  1 - A study on the antibacterial effects of ethanolic and methanolic extracts of Saffron (Crocus sativus L.) on some food borne pathogens
  Hossein Motamedi سید منصور سیدنژاد اسماعیل داراب پور
  Control of food borne diseases is a major concern and due undesirable side effects of chemical preservatives, there is more tendencies to natural preservatives such as spices for this purpose. Saffron is the most expensive spice that is is used as coloring and flavoring More

  Control of food borne diseases is a major concern and due undesirable side effects of chemical preservatives, there is more tendencies to natural preservatives such as spices for this purpose. Saffron is the most expensive spice that is is used as coloring and flavoring agent in foods. The aim of the present study was investigate antibacterial effects of hydro alcoholic extracts of saffron against pathogenic bacteria especially food poisoning species. For this purpose, one gram of finely powdered saffron was mixed with 10 ml of 2:8 (v/v) water- alcohol (ethanol or methanol) solution and mixed gently. Following incubation at room temperature, the suspension was centrifuged and the extract of saffron was harvested and dried. Sterile blank discs were saturated with extracts and their effects were evaluated in standard disc diffusion assay against six gram positive and six gram negative bacterial species. Simultaneously, the effect of standard antibiotics was evaluated against tested bacteria. The results revealed that Staphylococcus aureus, Bacillus anthracis, Bacillus cereus, Listeria monocytogenes and Brucella melitensis were the most susceptible species to ethanolic and methanolic extracts of saffron while Proteus mirabilis and Salmonella Typhi were resistant. The antibacterial effects of extracts were noticeable with regard to the standard antibiotics. All of the susceptible species in this study are important food borne pathogens and it is possible to use saffron as a natural preservative in food industry in order to control food borne pathogens. Manuscript profile
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  2 - A survey on bacterial contamination of fruit juice with Alicyclobacillus acidoterrestris using PCR and RFLP
  Hossein Motamedi Amir TajBakhsh
  Abstract Alicyclobacillus is an endospore forming and heat resistant bacterium that can cause changes in odor and color of fruit juice and make significant losses to juice industries. The purpose of this study was to identify this bacterium from different juic More

  Abstract Alicyclobacillus is an endospore forming and heat resistant bacterium that can cause changes in odor and color of fruit juice and make significant losses to juice industries. The purpose of this study was to identify this bacterium from different juices by PCR using specific primers. To do so, DNA extraction and PCR was done after culture and incubation. Of 24 tested samples, 5 cases were examined. As a consequence of enzymatic digestion with EcoR1 and electrophoresis, 118 and 528 bp fragments were obtained that are in accordance with RFLP pattern of Alicyclobacillus acidoterrestris. With regard to the obtained results, it can be claimed that contamination to this bacterium makes some problems in fruit juice industry. To diagnosis it better, PCR with high sensitivity can be used since it reduce the expenditures and save the time. Manuscript profile
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  3 - Isolation Alicyclobacillusacidoterrestris specific bacteriophage, the causative agent of fruit juice spoilage, from soil
  Amir TajBakhsh S.Elham Rezatofighi Hossein Motamedi Solmaz Rafiae
  Abstract Alicyclobacillusacidoterrestris is the main bacterial agent of fruit juice spoilage and the methods for its elimination are much paid attention to. Recently, using this phage for controlling bacteria in food products has received special attention. The aim of More

  Abstract Alicyclobacillusacidoterrestris is the main bacterial agent of fruit juice spoilage and the methods for its elimination are much paid attention to. Recently, using this phage for controlling bacteria in food products has received special attention. The aim of this study was to isolate the specific bacteriophages of A. acidoterrestris from soil. In this study, the samples collected from the soil around the Cedruslibani (Cedar) trees were investigated after being centrifuged and filtered to seek the understudied phage. Bacterial culture equal to0.5 McFarland turbidity, isolated from fruit juice and confirmed by molecular and biochemical techniques, was prepared in AAB. Adding a certain amount of environmental samples allowed the phage to be replicated in the environmentcontainingbacteria. Then, the environment was centrifuged and the supernatant, which is the source of the phage, was filtered. The pure phage suspension was assessed in double agar method for studying the formation, shape and size of plaques. Plaque formation confirmed the presence of bacteriophages in the filtrate. Consequently, the heat and acid resistant bacteriophage was isolated from the soilaround the Cedruslibani (Cedar) trees. The results revealed the presence of specific bacteriophage of A. acidoterrestris. This phage can be used for eliminating of this bacterium in fruit juice. Stability of these bacteriophages in fruit juices its specific. Preserving the fruit quality side is of advantages of using this bacteriophage comparing to other methods. Manuscript profile
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  4 - A report on pasteurized orange juice contamination with Bacillus licheniformis
  Hossein Motamedi Amir TajBakhsh
  Abstract Presence of the Fruit juice spoilage bacteria, including Bacillus spp., can be problematic in fruit juice industry. The aim of this study was to isolate and identify the bacteria being able to tolerate orange juice pasteurization conditions. In this study, 16 s More

  Abstract Presence of the Fruit juice spoilage bacteria, including Bacillus spp., can be problematic in fruit juice industry. The aim of this study was to isolate and identify the bacteria being able to tolerate orange juice pasteurization conditions. In this study, 16 samples of orange juice were prepared and investigated in sterile conditions. 0.5 ml of each sample was inoculated in orange serum agar medium and incubated at 43 °C. The isolates were identified using biochemical and antibiogram tests. As a result, From 16 prepared samples, 2 samples were contaminated with bacteria. The bacterium isolated from these samples was able to grow at up to 50 °C on Orange Serum agar. This isolate was then identified as Bacillus licheniformis using the classification system of Linnaeus. Despite of having no pathogenic nature and producing the spores resistant to temperature and acid, Bacillus licheniformis is of great importance according to the viewpoint that it can be mistaken in primary detection by Bacillus of fruit juice which are the spoilage agents and differentiated tests should be done to separate them from Alicyclobacillus spp. for preventing from presenting wrong report. Furthermore, the isolation of these bacteria indicates the inappropriateness of processing conditions to eliminate bacteria from fruit juice that may provide possibilities for growth of fruit juice spoilage bacteria. Manuscript profile
• Open Access Article
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  5 - A report on pasteurized orange juice contamination to Bacillus licheniformis
  Hossein Motamedi Amir TajBakhsh
  Presence of the Fruit juice spoilage bacteria, including Bacillus spp., can be problematic in fruit juice industry. The aim of this study was to isolate and identify the bacteria being able to tolerate orange juice pasteurization conditions. In this study, 16 samples of More

  Presence of the Fruit juice spoilage bacteria, including Bacillus spp., can be problematic in fruit juice industry. The aim of this study was to isolate and identify the bacteria being able to tolerate orange juice pasteurization conditions. In this study, 16 samples of orange juice were prepared and investigated in sterile conditions. 0.5 ml of each sample was inoculated in orange serum agar medium and incubated at 43 °C. The isolates were identified using biochemical and antibiogram tests. As a result, From 16 prepared samples, 2 samples were contaminated with bacteria. The bacterium isolated from these samples was able to grow at up to 50 °C on Orange Serum agar. This isolate was then identified as Bacillus licheniformis using the classification system of Linnaeus. Despite of having no pathogenic nature and producing the spores resistant to temperature and acid, Bacillus licheniformis is of great importance according to the viewpoint that it can be mistaken in primary detection by Bacilluses of fruit juice which are the spoilage agents and differentiated tests should be done to separate them from Alicyclobacillus spp for preventing from presenting wrong report. Furthermore, the isolation of these bacteria indicates the inappropriateness of processing conditions to eliminate bacteria from fruit juice that may provide possibilities  for growth of fruit juice spoilage bacteria. Manuscript profile