نشریه کیفیت و ماندگاری تولیدات کشاورزی و مواد غذایی
سال دوم شماره 4 (پیاپی 8، بهار 1402)

Kiwifruit cv. Hayward has a high nutritional value due to its high content of vitamin C, phenolic compounds, minerals and organic acids. This has caused a significant increase in its production and consumption both in our country and in the world in recent years. Fruit quality both at the harvest time and during kiwifruit storage depends on a set of factors related to planting, and harvesting, as well as postharvest factors. Among the most important factors that affect the quality and storage of kiwifruit during the growing season, we can mention the cultivar, tree nutrition, pollination, tree crown management, summer pruning, degree of maturity and ripening, and the amount of fruit dry matter. Controlling each of these factors by considering their interaction effects can not only affect the quality of the fruit effectively and usefully but also increase the storability of kiwifruit.but also increase the storability of kiwifruit.but also increase the storability of kiwifruit.

The aim of this study was to develop a convenient, fast, effective and safe analytical method (QuEChERS) to determine 198 pesticide residues in date palm using gas chromatography-tandem mass spectrometry (GC/MS/MS). Extraction was performed with acetonitrile as the extracting solvent, magnesium sulfate in the presence of sodium chloride as the dehydration reagent, and PSA as purification phase to remove non-polar interfering substances such as lipids For this purpose, the effect of two affecting variables including extraction time and the volume of added water to the sample was investigated. To solve the effect of the matrix, the calibration curve was plotted using the analysis of spiked samples by dividing the peak area of the pesticides to the the peak area of the internal standard. The calibration curves for most pesticides were linear in the range of 15–150 μg/kg, with r2 values higher than 0.9934 and the relative standard deviation for all pesticides was ≤20%. The mean recovery rate of pesticides was 70-120% and limits of detection (LODs) and limits of quantification (LOQs) were in the range of 5–14 μg/kg and 14–40 μg/kg, respectively. The validated procedure was used to monitor pesticide residues in 30 fresh date samples. It can be concluded that the modified QuEChERS extraction method was efficient in analyzing pesticide residues in dates palm and none of the samples contained residues above the( Maximum Residue Limit) MRLs.

Water resources are among the natural capitals of every country, therefore, the preservation of these natural resources is one of the important challenges of all countries. Excessive use of chemical and industrial materials has created many problems for these sources. Therefore, providing new methods to remove water pollutants is very important. The method of green synthesis of nanoparticles has attracted a lot of attention due to its features such as greater safety, compatibility with the environment, simplicity, and low cost. In this research work, the green synthesis of zinc oxide nanoparticles was carried out using the Daphne macronata plant and it was used in the preparation of a cellulose acetate/zinc oxide filter. The electron microscope image of the nano filter shows that the average diameter of nanofibers is about 40 nanometers and the average size of nanoparticles is about 47 nanometers. Also, the effect of this filter in removing methyl orange dye from water sources was investigated in different conditions of dye concentration, amount of adsorbent, and pH. The results showed that the cellulose acetate/zinc oxide nanocomposite filter is able to remove about 90% of methyl orange color in optimal conditions. Also, the results of investigating the antimicrobial effect of this structure on 4 samples of pathogenic bacteria, including Bacillus cereus and Staphylococcus epidermis, Salmonella, and Acinetobacter were carried out. The results showed that the largest diameter of the halo of non-growth is related to the pathogenic bacteria Bacillus cereus and Staphylococcus epidermis and is about 22 mm

pathogenic bacteria in food are the cause of many infections and food poisoning. The prevalence of bacterial contamination is high in developing countries, and Staphylococcus aureus, Salmonella and Escherichia coli account for the highest amount of food contamination; Therefore, the aim of this study is to investigate the prevalence of Escherichia coli, Staphylococcus aureus and Salmonella in water, fruit juice and traditional ice creams offered in Qom city, Iran.

In the present study, 300 samples, including 100 water samples, 100 fruit juice samples, and 100 traditional ice cream samples, were taken from supply centers, sampled and transferred to the food hygiene laboratory of Shahrekord Azad University. SPSS version 26 statistical software and Kai-Hat statistical test were used for data analysis. A significant level (P<00.05) was considered.

The results showed that out of 300 studied samples, 170 samples were infected with pathogenic microorganisms. In this way, the amount of Escherichia coli, Staphylococcus aureus and Salmonella contamination in water was 1, 16 and 2 samples, in traditional fruit juice 8, 46 and 26 samples and in traditional ice cream 8, 59 and 28 samples.

According to the present results, it is necessary to refrain from consuming traditional fruit juice and traditional ice cream in centers that have unfavorable health conditions and to use purified water, and if there is no purified water before Boiled water should be consumed to prevent food-borne diseases.

Tramadol and methadone are synthetic opioid drugs that are widely used in various fields today to reduce pain, on the other hand, excessive use of these drugs causes addiction and poisoning in users. Knowing the complications and symptoms of poisoning of these drugs, along with the prevalence of their consumption, can be used to take the necessary measures to limit arbitrary consumption and prevent poisoning in consumers, especially in women who form the foundation of society and family. It can be helpful.

This article is a systematic review to investigate the prevalence of tramadol and methadone use and the side effects of long-term use in women. In this research, the search was conducted in SID, MagIran, Pubmed, Medline and Google Scholar electronic databases and due to the large volume of study articles, it was limited to the years 2000 to 2022.

By summarizing the findings of the studies, tramadol and methadone drugs are used by a wide range of people with different demographic conditions. The statistics of addiction in young people and the complications caused by women's addiction are far more than other groups. Considering the current conditions, it is necessary to be aware of the potential dangers of these two drugs and monitor their distribution and administration.

Oxidation in meat products is one of the factors led to change the taste and quality. This research was carried out the effect of α-tocopherol and palmitate ascorbyl on the lipids oxidation in frankfurter sausages. This research is done based on factorial experiment in a completely randomized design with three replications.Results showed that, the pH levels in different amount of α-tocopherol and palmitate ascorbyl were similar and significantly lower than the control samples. The pH level in all samples showed a decreasing trend by passing the time and this reduction amount were different in all samples. The peroxide value increased by passing the time but peroxide changes during time were not similar in all samples. The results showed after 45 and 60 days two samples, T2 and T4 did not show a significant difference with control sample but samples T1 , T3 and T5 were placed in the same group in time study. The highest amount of thiobarbituric acid, was observed in the control sample with highest amount of thiobarbituric acid in 45 and 60 days and the lowest amount was in the 0 day. On the other side, results showed in 0 day samples 5 and 2, in 45 and 60 days samples 3 and 4 had the highest and lowest %RSA, respectevily. Also, there was a difference significant between treatment levels. The results showed that the natural antioxidations α-tocopherol and palmitate ascorbyl are a useful additives to reduce lipid oxidation in frankfurter sausage.

Salmonellosis is one of the most important common diseases of humans and animals worldwide, which causes food poisoning, gastroenteritis, enteric fever and bacteremia in humans. The purpose of this study is to investigate the antimicrobial properties of the medicinal plants Psidium guajava, Nerium oleander, Sinapis alba, Satureja hortensis on Salmonella Typhimurium.

Salmonella typhimurium samples were isolated from poultry feces, extracts of Psidium guajava, Nerium oleander, Sinapis alba, Satureja hortensis plants were prepared using a rotary device, and the minimum inhibitory concentration and the minimum lethal concentration were determined by the microdilution method, and the diameter of the inhibition zone was determined by the well method.

The results of the investigation of the inhibition halo diameter of plant extracts showed that the maximum and minimum inhibition halo diameters of P.guajava plant extract were 8 and 1 mm, and the maximum and minimum inhibition halo diameters of N.oleander flower extract were 15 and 1 mm. The maximum and minimum diameters of the inhibition zone of S.alba extract on Salmonella typhimurium were 12 and 1 mm, and the minimum and maximum diameters of the inhibition zone of S.hortensis extract on Salmonella typhimurium were 1 and 4 mm, and the results showed that that the smallest diameter of the inhibition halo was related to the salty extract.

Discuss:

The results of this study showed that medicinal plants have shown good inhibitory effects on Salmonella Typhimurium.