Faculty of Agricultural Sciences and Food

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Author: search.filters.author.Stojiljkovic, Jasmina

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    THE INFLUENCE OF DIFFERENT CONCENTRATIONS OF PLANT ESSENTIAL OILS ON GROWTH AND REPRODUCTION OF Salmonella enteritidis
    (Goce Delchev University - Shtip, 2020)
    Stojiljkovic, Jasmina
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    Plant essential oils have been reported to possess antimicrobial properties and therefore have potential usage as natural antimicrobials of food. The aim of the study was to examined the antimicrobial effect of sweet basil and thyme essential oils against growth and reproduction of Salmonella enteritidis reference strain ATCC 13076 (S. enteritidis RS) and Salmonella enteritidis epidemical strain (S. enteritidis ES) cultivated on plate. Therefore, the samples were prepared as a dip application from different concentrations of sweet basil and thyme essential oils (1%; 2.5% and 5%) with initial concentration of bacteria from 109 CFU/mL and were cultivated on plate. The control samples were prepared as dip application of bacteria without added essential oils. All samples were exposed at 37°C and 46°C. The growth of S. enteritidis RS and S. enteritidis ES was observed only in the control samples without added sweet basil and thyme essential oils. There was not any growth of both Salmonella еnteritidis strains in the samples dipped in the 1%; 2.5% and 5% sweet basil and thyme essential oils. The results from the ANOVA indicate that the utilized essential oils in combination with temperature regime was significantly (p <0.001) reduced the CFU number of the both strains of Salmonella enteritidis. These results support the possibility of using sweet basil and thyme essential oil as natural preservatives in food to contribute in the reduction of Salmonella enteritidis at acceptable levels in view to prevent the risk for consumers.
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    In vitro antimicrobial properties of basil and thyme essential oils against Salmonella Spp
    (Macedonian Pharmaceutical Association, 2020-10-29)
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    Stojiljkovic, Jasmina
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    Glavash Dodov, Marija
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    Antibacterial activities of rosemary essential oils and their components against pathogenic bacteria
    (MedCrave Group, LLC, 2018-09-18)
    Stojiljkovic, Jasmina
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    There are many known essential oils, of which only 300 are commercially important for different types of industry. Antimicrobials are used in food for two main reasons: to control natural spoilage processes and to prevent/control growth of micro-organisms, including pathogenic microorganisms. The aim of this review was to investigate antibacterial effects of rosemary essential oils (EOs) on some Gram-positive and Gram-negative bacteria: Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Proteus vulgaris, Pseudomonas aeruginosa. Listeria monocytogenes, Salmonella enteritidis, Salmonella typhimurium. Rosmarinus officinalis essential oil is very important for its medicinal uses and its powerful antibacterial, cytotoxic, anti-mutagenic, antioxidant, anti-phlogistic and chemopreventive properties. The antimicrobial and other biological activities of rosemary essential oil are directly correlated with the presence of bioactive volatile components. To this end, one possibility has been the use of rosemary essential oils (EOs) and the compounds found there in as alternative antimicrobial food preservatives. The future will see investigation of food applications of the naturally occurring antimicrobials, especially the effectiveness of rosemary EOs, individually and in combination with other parts of plant extract, other effective EOs and other food-processing techniques.
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    GROWTH OF SALMONELLA ENTERITIDIS IN EGG-BASED PASTA
    (INSTITUTE OF KNOWLEDGE MANAGEMENT SKOPJE, 2019-12)
    Stojiljkovic, Jasmina
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    Velkoska Nakova, Valentina
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    The food safety is significant health and economic issue. Many foodborne microorganisms are causing alimentary infection and they are main reason for millions of disease outbreaks worldwide. Salmonella enterica subsp. entericа serovar Enteritidis is one of the most common pathogenic bacteria causing foodborne human disease. Salmonella spp. are alive to heat, pH value highest than 9.0 and lower than 4.5 have bactericidal effect and aw for their growth is lower than 0.93. The bacteria from genus Salmonella appears to be resistance to drying, slating and smocking and therefore they can be found in the wide types of food. The aim of the paper was to review the literature data for foodborne salmonellosis prevalence in human with attention to growth in egg-based pasta. Pasta is a useful food for people and has a significant place in the diet. They are cheap, easy for cooking, and wholesome, and can be stored for a long period compared with some other foods. The basic raw materials for production of pasta are flour and chicken's eggs. Since eggs are used for the production of pasta, due to insufficient thermal treatment of the mixture during the pasta drying phase, they can be a potential risk for the presence of bacteria implicating the high risk to consumer health. Inside the egg, the growth of Salmonella is facilitated by the temperature of storage. Eggs should be stored at a constant temperature that should not exceed 20oC. If Salmonella reaches the egg yolk, it can grow rapidly even at room temperature (25oC). The high incidence of salmonellosis can be preventing by using the fresh eggs and practicing GHP during food manufacturing. The conditions for fresh pasta drying have a great influence on the final product quality from the aspect of texture and consistency. The thermal treatment of fresh pasta at 102°C for 100 seconds and packing at modified atmosphere can prevent the microbiological hazards in the final product. In order to eliminate or reduce microbiological risks in pasta, it should be useful the knowledge of the antimicrobial ability of plants essential oils and possibilities for their application in the technology of pasta production.
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    ENZIMATIC ANTIOXIDANTS IN RAW COW MILK
    (INSTITUTE OF KNOWLEDGE MANAGEMENT SKOPJE, 2019-12)
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    Velkoska Nakova, Valentina
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    Stojiljkovic, Jasmina
    Dairy cows’ experience a drastic change in metabolism after parturition that can lead to oxidative stress. Lipid auto-oxidation in milk is affected by a complex interplay of prooxidants and antioxidants. Several of these compounds are also important nutrients in the human diet and may have other physiological effects. Among the others, antioxidative enzymes superoxid dismutase (SOD) and glutathion peroxidase (GPX) have important role in milk antioxidative capacity. The two years prospective study was carried out to assess the changes occurring in the milk activity of antioxidant enzymes SOD and GPX in two physiological periods: period from beginning of lactation until 21st day in lactation and period from 22nd to 42nd day in lactation. Totally, there were followed 211 cows allocated in groups regarding the season of calving. Determination of the enzyme activity was assayed on milk serum by using spectrofotometric methods. The average activity of SOD in period from beginning of lactation until 21st day in lactation was 91.67±7.927 mU/mg proteins, than decreasing to 90.89±8.526 mU/mg proteins in the second physiological period from 22nd to 42nd day in lactation. The average activity of GPx in period from beginning of lactation until 21st day in lactation was 231.90±12.133 mU/mg proteins, than increasing in the period from 22nd to 42nd day in lactation (236.16±13.175 mU/mg proteins). Physiological stages in early lactation when milk samples were taken didn’t have statistical significant influence on SOD and GPx activity in milk. The activity of SOD and GPx in milk statisticlly significant (p<0.001) differed between season years of calving. The highest statistical significant difference in the activity of SOD in milk was found in the summer and fall seasons in second year of survey compared with other seasons. Regarding the GPx activity in milk there was statistical significant differences between all seasons of years. The test day milk yield had statistical significant influence on GPx activity in milk but this factor didn’t have statistical significant influence on SOD activity. There was statistically significant positive correlation between the activity of GPx and SOD in the milk samples. The SOD/GPx ratio in milk has important role in the balance of reactive oxidative metabolites in milk.
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    THE INFLUENCE OF DIFFERENT CONCENTRATIONS OF PLANT ESSENTIAL OILS ON GROWTH AND REPRODUCTION OF Salmonella enteritidis
    (Faculty of Agriculture of Goce Delcev University, 2019)
    Stojiljkovic, Jasmina
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    Plant essential oils have been reported to possess antimicrobial properties and therefore have potential usage as natural antimicrobials of food. The aim of the study was to examine the antimicrobial effect of sweet basil and thyme essential oils against growth and reproduction of Salmonella enteritidis reference test strain ATCC 13076 and food isolated Salmonella enteritidis - epidemic strain (group D) cultivated on plate. Therefore, the samples were prepared as a dip application from different concentrations of sweet basil and thyme essential oils (1; 2.5 and 5%) with initial concentration of bacteria from 109 CFU/mL and were cultivated on plate. The control samples were prepared as dip application of bacteria without added essential oils. All samples were exposed at 37°C and 46°C. The growth of Salmonella enteritidis reference test strain ATCC 13076 and Salmonella enteritidis - epidemic strain was observed only in the control samples without added sweet basil and thyme essential oils. There wasn’t any growth of Salmonella еnteritidis in the samples dipped in the 1; 2.5 and 5% sweet basil and thyme essential oils. The results from the ANOVA indicate that the utilized essential oils in combination with temperature regime was significantly (p <0.001) reduced the Log10 concentration (enumeration) of the booth strains of Salmonella enteritidis. These results support the possibility of using sweet basil and thyme essential oil as natural preservatives in food to contribute in the reduction of Salmonella enteritidis at acceptable levels in view to prevent the risk for consumers.