نشریه کیفیت و ماندگاری تولیدات کشاورزی و مواد غذایی
سال دوم شماره 1 (پیاپی 5، تابستان 1401)

In order to investigate the effect of biodegradable nanocomposite edible coatings carboxymethylcellulose-based on the internal quality and morphology of the table eggshell surface an experimental with 120 eggs in a completely randomized design with 4 treatments and 3 replicates were performed. Treatments included uncoated eggs (control), eggs containing carboxymethylcellulose coating, eggs containing carboxymethylcellulose-oleic acid coating and eggs containing carboxymethylcellulose-oleic acid-nanoclay nanocomposite coating. Coating was done by immersion method and the eggs were stored at ambient temperature (25±1oc) for 5 weeks. Internal quality parameters were evaluated at the end of weeks 1, 3 and 5 and eggshell surface morphology at the beginning and end of the experimental period. The results showed that eggs containing nanocomposite coating at the end of storage period have the lowest percentage of weight loss and the lowest numerical value of thiobarbituric acid index (P <0.05) and the highest numerical value of albumen pH, the highest numerical values of yolk index and haugh units (P <0.05). In addition, the surface of the eggshell containing nanocomposite coating was more integrated and less porous and fractured than the control group. Therefore, the nanocomposite coating of carboxymethylcellulose-oleic acid-nanoclay can be used as a biocompatible packaging for storage eggs at ambient temperature for 5 weeks without adversely affecting the internal quality and eggshell.

Contamination and spoilage of food are important in many ways, such as health and the economy. Identification of food contamination can significantly help to improve food production and distribution processes and prevent the wastage of many resources. In Iran, many researches have been carried out in this field during continuous periods of time, and a careful examination of these researches can provide valuable information. In this article, an attempt has been made to briefly review the types of food contamination in the dairy, meat, and confectionery categories in recent years in Iran and provide a bibliometric report of the documents published in the Scopus database without a time limit. The results of the investigations revealed that Escherichia coli and Staphylococcus aureus bacteria are probably more important than other bacteria in this country. The low ratio of the number of review documents to articles and also the lack of publication of no book in this database can be of interest to researchers to collect, summarize and conclude this information, which will definitely be useful.

About 70% of the world's population's food comes directly from crops, of which the important role of oilseeds can not be denied. Oil consumption in Iran has increased in recent years due to population growth and per capita consumption, so that considering the per capita consumption of 14 kg, about 750,000 tons of oil is needed annually. However, less than 10% of this oil is produced domestically. Due to this issue, oil production through rapeseed cultivation has been considered in recent years. Drought is a threat to the successful production of crops worldwide. Drought occurs when a combination of physical and environmental factors causes internal stress in a plant and reduces production. Water stress has a negative effect on many plant processes, including photosynthesis, evaporation, accumulation and allocation of precursors, and causes a significant reduction in crop production. Therefore, one of the ways to maximize water use efficiency and increase yield per unit of water consumption is low irrigation, in which the crop is subjected to water stress at a certain stage of development or throughout the development season. On the other hand, the positive effects of potassium in increasing the resistance of plants to dehydration stress have been reported by researchers.

Cheese is a product consisting of fat and milk protein, along with calcium and phosphorus that are combined with milk protein in various ways. Due to the importance of cheese consumption among the people of Iran and considering that this product is one of the most important dairy products and according to available statistics, about 20% of the milk produced in the dairy industry is converted into cheese, of which the share of production Traditional cheese is about 80%. The purpose of this study was to evaluate the level of contamination of traditional cheeses offered in different areas of Karaj. The present descriptive cross-sectional study was conducted in the summer of 1398 by sampling different parts of the north, west, east, south and center of Karaj . Four types of bulk cheeses of Tabriz Ligvan, lactic, white and gypsum in five geographical areas with three replications were examined for the presence of Staphylococcus aureus. The results shows the contamination of traditional cheeses and its different areas, although the rate of contamination in the west was higher than other areas. Among the regions, the eastern region with the lowest level of pollution among other regions and the presence of contamination only in gypsum cheese, was identified as the least dangerous region. In contrast to the existence of high pollution in all four types of cheese studied in the west. based on the results, this part of Karaj was introduced as the most dangerous area in the consumption of traditional cheeses.

In this work, a molecular imprinted polymer as a novel selective sorbent for extraction ofmetronidazole from plasma sample was prepared. For selecting a more suitable monomer and polymerization solvent a methodology based on density functional theory calculations was developed. This computational design is based on the comparison of energies of the prepolymerization adducts between the template and different functional monomers. The effect of polymerization solvent was studied using of polarizable continuum model. First of all structures were drawn separately and complex using software Guassian view. The structures optimization was performed using DFT computations at B3LYP level with 6-311G(d) basis set. The outputs were investigated to determine interaction hydrogen using the mechanical quantum and natural bond orbital. The polymers were characterized by techniques such Fourier transform infrared spectroscopy and scanning electron microscopy. The removal mechanism drugs was evaluated by using Langmuir and Freundlich isotherin. This MIP was used as a selective sorbent in coupled with high performance liquid chromatography for rapid screening of metronidazol.

Due to the increasing resistance of pathogenic bacteria to common antibiotics, researchers are looking for antimicrobial agents of plant origin as alternative drugs. The aim of this study is to investigate the antimicrobial activity of peperin isolated from black pepper on Staphylococcus aureus isolated from the nose and throat. Sampling was done from the pharynx and nose of the patients and 9 strains of Staphylococcus aureus were isolated and purified. The minimum inhibitory concentration (MIC) and the minimum lethal concentration (MBC) in six concentrations were evaluated by dilution method in liquid medium on the determined bacteria. The results of this study showed that the lowest inhibitory concentration was equal to 8 μg/ml, which inhibited one strain, while the highest concentration was 512 μg/mg, which inhibited one strain. Staphylococcus aureus isolated the most It was resistant to trimethoprim (88.8%), ampicillin (77.7%), tetracycline (77.7%), erythromycin (66.6%) and ceftazidime (22.2%). The results of this study showed that piperine present in black pepper has a very strong inhibitory effect on Staphylococcus aureus bacteria isolated from the nose and throat.

Carla medicinal plant, with the scientific name Charantia Momordica, is a tropical and subtropical plant from the gourd family.which is widely cultivated in Asian, African and South American regions to use its fruit. Carla plant has anti-microbial, anti-cancer, anti-diabetic, anti-coagulant, anti-pregnancy and anti-diabetic properties. Therefore, basic planning for the development of activities and protection, restoration and exploitation of this plant in natural areas requires a detailed examination of the current situation, recognition of the potentials in agricultural areas and natural resources as the main origin of the country's native species, and a correct understanding of the limitations and challenges along with the development. It is the science of its processing and consumption. This study was also conducted in order to know the medicinal, phytochemical, economic, etc. potentials of Moringa plant. t is the science of its processing and consumption. This study was also conducted in order to know the medicinal, phytochemical, economic, etc. potentials of Moringa plant.t is the science of its processing and consumption. This study was also conducted in order to know the medicinal, phytochemical, economic, etc. potentials of Moringa plant