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Showing 8 results for Hashemi

Majid Aminzare, Mohammad Hashemi, Hassan Hassanzad Azar, Jalal Hejazi,
Volume 1, Issue 2 (3-2016)

Meat and meat products are highly prone to microbial deterioration since they are rich in essential nutrients and perishable in nature and if they are not properly preserved, public health problems may occur. Recently, in order to increase the microbial quality of meat and meat products, novel ingredient systems that are associated with natural and organic foods, are applied. Many studies have demonstrated the antimicrobial activity of plant-origin natural antimicrobials in meat and meat products. Nevertheless, advanced technologies can improve the microbial stability and the sensory quality of meat products containing natural extracts and essential oils through different techniques. This paper first reviews the microbial deterioration of meat and meat products and their traditional storage techniques and then discusses the manner and extent of the use of herbal extracts and essential oils in these products.

Mojtaba Raeisi , Mohammad Hashemi , Ali Reza Sadeghi , Majid Aminzare , Mahdi Khodadadi, Amir Mahmoud Ahmadzadeh , Asma Afshari,
Volume 2, Issue 4 (9-2017)

Background: Zataria multiflora boiss is a member of Lamiaceae family with antibacterial, antifungal, and antioxidant activity. The aim of this study was to evaluate chemical composition and antibacterial effect of Zataria multiflora essential oil against two foodborne pathogens in meat.
Methods: The inhibitory effect of Zataria multiflora essential oil (Minimum inhibitory concentration and Minimum bactericidal concentration) was evaluated against Salmonella  typhimurium and Listeria monocytogenes, inoculated in ground beef meat after 3, 5, 7 and 9 days of storage.
Results: Result revealed 26 various compounds, representing 96.27% of total oil. Thymol was the most abundant compound among all constituents (29.2%). A significant reduction was observed in Salmonella typhimurium when adding 1 and 2% Zataria multiflora (p<0.05) compared with 0.5% and 1% concentrations during 9 days of storage. Listeria monocytogenes significantly decreased in treatments with 0.5%, 1 and 2% of Zataria multiflora essential oil.
Conclusion: Zataria multiflora has an inhibitory effect on the growth of L. monocytogenes and in higher concentrations on the growth of S. typhimurium and can be used as a natural preservative in order to retard the growth of food-borne pathogens.

Saber Barkhori-Mehni, Saeed Khanzadi, Mohammad Hashemi, Mohammad Azizzadeh,
Volume 2, Issue 4 (9-2017)

Background: The aim of this study was to investigate antimicrobial effect of Zataria multiflora Boiss essential oil (EO) against six fish spoilage bacteria for evaluation of its potential utilization in the preservation of minimally processed fish products.
Methods: Firstly, GC-MS analysis of the EO was performed to determine its chemical composition. Then, antibacterial effect of the EO in a range of 0.031 to 4 mg/ml was tested against different fish spoilage bacteria such as Aeromonas hydrophila, Pseudomonas aeruginosa, Pseudomonas fluorescens, Shewanella putrefaciens, Escherichia coli and Bacillus subtilis by broth microdilution method to determine minimum inhibitory (MIC) and minimum bactericidal (MBC) concentrations.
Results: GC-MS results showed that phenolic components such as carvacrol (51.55%) and thymol (25.49%) were predominant constituents of the EO. Zataria multiflora Boiss EO exhibited strong antimicrobial activity against all tested bacteria. Shewanella Putrefaciens was the most sensitive bacteria with MBC value of 0. 5 mg/ml.
Conclusion: According to the results, this EO could be used as an important natural alternative to prevent bacterial growth in food specially seafood products to preserve them against bacterial spoilage.
Javad Abbasi, Zohreh Samarghandi, Hesam-Aldin Akbarein, Mohammad Hashemi, Zahra Amani, Ali Tayefeh, Mohammadreza Rezaeigolestani,
Volume 4, Issue 1 (3-2018)

Background: The socio-economical and geographical conditions of Iran cause most of the people consume dairy products or are in close contact with livestock, that these expose many individuals to Brucella spp. Since Qazvin province is considered as a moderate burden of brucellosis, the need for a comprehensive epidemiological study of the disease in this province is quite essential.
Methods: This study is a descriptive study (secondary data analyses) that performed on registered data in department of disease control in health centers of Qazvin province from 2002 to 2009. Data were analyzed by SPSS software (Version 16.0).
Results: Totally, 4037 confirmed brucellosis cases were recorded, which the annual incidence of the disease was roughly decreasing during 2002-2009. The frequency of the illness in the male population was higher than that of women. Most cases were detected in summer and spring and occupational exposure had no significant impact on occurrence of the disease (P < 0.05).
Conclusion: The results of this study are greatly in line with the national pattern and other studies. Prohibition of consumption of uncontrolled traditional dairy products along with production of these products under hygienic conditions in modern industrial plants can prevent occurrences of human brucellosis.

Zahra Yousefi, Mohammadreza Rezaeigolestani, Mohammad Hashemi,
Volume 4, Issue 2 (5-2018)

Background: This review tries to explain various biological properties of olive oil.
Methods: In present review, data were obtained via a complete search through online databases including PubMed, Google Scholar, SID and ScienceDirect to find the relevant titles and paper abstracts using keywords like ‘olive oil’, ‘biological effect’ or ‘therapeutic’ or ‘food’. The obtained articles have been reviewed to evaluate different biological and therapeutic properties of olive and its edible products.
Results: Olive fruit and oil and the products obtained from olive tree (e.g., olive leaf extract) have unique medicinal properties. Studies have confirmed the positive effects of olive oil on wound healing, pain relief, cancer treatment, stroke, and cardiovascular diseases. In addition to the sensory properties of olive oil, the consumption of olive oil in the daily diet could enhance the safety and quality of food through antimicrobial and antioxidant compounds.
Conclusion: Considering the unique and significant medicinal and nutritional benefits of olive oil, it is necessary to encourage people toward the consumption of olive oil and increase their awareness about the importance and advantages of this product.

Fatemeh Raji, Saeid Khanzadi, Mohammad Hashemi, Mohammad Azizzadeh,
Volume 5, Issue 1 (3-2019)

Background: Active antimicrobial packaging is a novel method for increasing the safety and shelf life of food products. The present study aimed to investigate the inhibitory effects of chitosan coating nano-emulsion incorporated with Zataria multiflora and Bunium persicum essential oils at the concentrations of 0.5% and 1%, respectively on E. coli O157:H7 in vacuum-packed fish samples during 12 days of refrigeration.
Methods: The samples were divided into various groups, including control (no coating), 2% chitosan, 2% chitosan nano-emulsion, and chitosan coating nano-emulsion containing Zataria multiflora and Bunium persicum essential oils at the concentrations of 0.5% and 1%, respectively. The samples were vacuum-packed and stored at refrigeration temperature, and bacterial counting was performed on days zero, one, two, four, six, eight, and 12.
Results: The mean bacterial count had a significant difference between the study groups during 12 days of storage (P < 0.001). The most significant inhibitory effect on the growth of E. coli O157:H7 was observed with nano-emulsion of chitosan containing 1% of Bunium persicum.
Conclusion: According to the results, using the nano-emulsion of chitosan coating with essential oils could effectively decrease the growth of E. coli O157:H7 in food products, especially food especially fish.

Saeid Khanzadi, Asghar Azizian, Mohammad Hashemi, Mohammad Azizzadeh,
Volume 5, Issue 2 (6-2019)

Background: The present study aimed to determine the chemical composition and in-vitro antibacterial activity of Ziziphora clinopodioides essential oil (ZCEO).
Methods: The chemical composition of ZCEO was determined using gas chromatography-mass spectrometry (GC-MS) analysis. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were calculated using the microwell dilution assay to assess the antibacterial effects of ZCEO emulsion and nano-emulsion on E. coli O157:H7.
Results: A yield of 1% (w/w) was identified for ZCEO isolation and pulegone (58.78%), menthone (1.15%), and isomenthone (9.91%) as the key components of ZCEO phytochemicals. The MIC values of the ZCEO emulsion and nano-emulsion were 0.8 and 0.025 mg/ml, respectively, and the MBC values were estimated at 1.6 and 0.05, respectively.
Conclusion: It is recommended that the nano-emulsion of ZCEO be applied as a potential source of natural preservatives in food industries.

Batool Soltaninezhad, Saeid Khanzadi, Mohammad Hashemi, Mohammad Azizzadeh,
Volume 6, Issue 1 (3-2020)

Background: Antimicrobial compounds have numerous applications, and essential oils could be used in edible films to enhance the food shelf life. This study aimed to assess the inhibitory effects of a chitosan/cellulose nanofiber (CNF) film containing the nanoemulsions of Bunium persicum essential oil (NBPEO) and Trachyspermum ammi essential oil (NTEO) on Escherichia coli O157:H7 inoculated in hamburger during storage  (4°C).
Methods: After inoculation, the hamburger samples were classified into three treatment groups of, control, chitosan containing 7.5% CNF (Ch-CNF), and chitosan containing 7.5% CNF enriched with 1.6% NTEO and 0.8% NBPEO (Ch-CNF-NEO). The samples were preserved at the temperature of 4°C, and the bacterial counts were determined on days zero, three, six, nine, and 12. Data analysis was performed using Bonferroni post-hoc test and repeated measures ANOVA.        
Results: The mean E.coli O157:H7 count significantly decreased in the treatments groups compared to the control group. In addition the Ch-CNF-NEO film exerted the most significant inhibitory effects on the growth of E. coli O157: H7 in the hamburger samples.
Conclusion: According to the results, the Ch-CNF-NEO film could effectively reduce the growth of E. coli O157:H7 in hamburger. Therefore, Ch-CNF-NEO film could be used to effectively increase the safety of meat products against E. coli O157: H7.

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