نشریه کیفیت و ماندگاری تولیدات کشاورزی و مواد غذایی
سال دوم شماره 2 (پیاپی 6، پاییز 1401)

Bentonite-β-cyclodextrin-iron nanoparticles (Ben-βCD-INP) composite was synthesized,characterized, and utilized like an innovative magnetic solid-phase extraction ( MSPE) adsorbent to separate and preconcentrate trigonelline . Experiment conditions to find important variables of trigonelline adsorption on the Ben-βCD-INP were A: time, B: Adsorbent amount, C: pH and for desorption were A: temperature, B: concentration, C: time, and D: Volume .. The adsorbent contributes significantly in the extraction process. The INP in the nano composite makes it easy to remove the adsorbent with the help of a magnet. Scanning electron microscopy( SEM ), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), and X-ray diffraction (XRD) were used to characterize the synthesized adsorbent. Experimental design was used to optimize the factors affecting extraction. trigonelline in plasma samples was extracted and evaluated by a reversed-phase HPLC–UV method. The findings have shown that MSPE was able to extract trigonelline efficiently. The developed HPLC–UV procedure for the determination of trigonelline in human plasma, showed linear relation shipin the concentration interval of 0.05-10 mg/L (r = 0. 9998) with the limit of detection (LOD), the limit of quantitation (LOQ) and recovery (%) of 0.005, 0.018 mg/L, and 114%, respectively. The procedure was successfully used to determine the concentration of trigonelline in human plasma. This study offers a promising hybrid nano bio material adsorbent in biomedical nanotechnology to selective measurement of the drug or supplements such as trigonelline from plasma.

There is a lot of evidence about the beneficial biological effects of probiotics in food and dairy products. Antimicrobial properties, ability to produce biosurfactant and biosynthesis of nanoparticles are among the significant effects of these organisms. The aim of this research is the biosynthesis of magnesium oxide nanoparticles by Enterococcus hirai from traditional yogurt. MRS agar culture medium was used to isolate probiotics. Biosurfactant-producing isolates were examined in terms of hemolysis, crude Oil Spreading Assay, Drop Collapse Assay and emulsification index, the best isolate for the production of magnesium oxide nanoparticles, size, antioxidant activity, FTIR and antibacterial effects were evaluated and identified by PCR. 9 isolates had probiotic properties, isolate L11 was selected with higher biosurfactant production ability. The antibacterial property of the produced biosurfactant was shown against Gram-positive and Gram-negative bacteria. This strain was also able to produce magnesium oxide nanoparticles. The formed nanoparticles with a size of 135 nm showed significant antibacterial and antioxidant effects. The best strain was introduced as Enterococcus hirai. According to the findings, it seems that this probiotic strain producing biosurfactant and magnesium oxide nanoparticles can be used in food and industrial industries.

Recent research has shown that long, porous nanofibers are one of the safest nanomaterials due to their controllable production, high specific surface area and continuous matrix structure. In this study, following the previous study of the authors, Structural phases of nanofibers were synthesized from combination of polyvinylidene fluoride (PVDF) and iron/manganese binary oxide nanoparticles (FMBO) were evaluated. Mineral adsorbents were integrated into polymer matrix in the range of zero to 0.5. The properties of nanofibers according to the structure and surface characteristics using SEM and TEM were determined. In this study, structural phases of PVDF and PVDF/FMBO electrospinning nanofibers were distinguished by examining the FTIR vibration bands and analyzing the XRD characteristics due to the different reports on the analysis of α, β and γ phases according to the measured data. The results of FTIR, specifically by examining bands 762 and 612, 1275 and 1234 cm-1 and its compliance with XRD results and reviewing published research the α, β and γ phases were distinguished, respectively.

Indiscriminate use of antibiotics to treat bacterial diseases in aquaculture has caused the emergence of drug resistance in bacterial strains and reduced the effectiveness of drugs, in addition, it has caused the accumulation of antibiotics in the body of fish and fish consumers. Therefore, it seems necessary to replace less harmful substances, including plant products. The aim of this study is to review fish pathogenic bacteria and the effect of medicinal plants on them.

In this study, valid scientific articles indexed in ISI, SID, PubMed, PubMed Central, Scopus, Web of Science databases were examined using Persian keywords drug resistance, fish pathogenic bacteria, medicinal plants.

A review of the studies shows that medicinal plants and their compounds are able to destroy fish pathogenic bacteria and infections caused by them in different concentrations.

According to the obtained results, medicinal plants can be suggested for the treatment of infections caused by fish pathogenic bacteria.

Agricultural products have a lot of waste in the stages of production to distribution, which reduces production and increases the need for mechanical imports as an effective and main factor in post-harvest losses.The present study is a cross-sectional descriptive-library research. Sampling was done by census method. The questionnaire was given to 384 members of the statistical sample. Analysis was done using SPSS software using descriptive and inferential statistics.This decrease in quality causes mechanical damage to the product. Tomatoes are more likely to become waste because the fruit is made up of 93 to 95 percent water and 5 to 7 percent solids. In this study, the effect of types of transportation, type of packaging, volume of cargo, type of cargo arrangement and distance of transportation on the amount of tomato waste was investigated. Based on the results obtained in this study, the amount of tomato waste can be reduced. Fruit bruising often occurs during the stages of transportation, transportation, packaging due to the impact on it by moving parts of machines and other factors. Mechanical shocks are recognized as the main and effective factor in post-harvest losses. During the post-harvest stages, dynamic loads are more effective in causing contusions in crops. Because dynamic loads have a greater effect than static loads in terms of quantity and occurrence

Nitrite and nitrate are used in some products, such as sausages. Excessive consumption of these chemicals is hazardous for humans, so the use of these compounds must be within the standards ranges. The aim of this research was measurement of nitrite residue in meat products which were marketed in Tabas city. Totally100samples from four different meat products were collected randomly and studied in the food laboratory of South Khorasan provincial of standard and industrial research service by spectrophotometric method. Data were analyzed with SPSS-19 software. The statistical analysis of data showed that the nitrite content in Mortadella, dry sausages, Bockwursts and cocktail sausages was higher than Iranian standard limit in 24%, 16%, 12% and 4% of samples, respectively and in this regard, 14% of all samples were distinguished unusable. The average amount of nitrite in all samples was 72.33± 2.8ppm, moreover the highest and the lowest level of nitrite observed in Mortadella (92±4.7 ppm) and Cocktail sausages (52.1±3.04 ppm), respectively, also the average amount of nitrite in all samples and different brands, was lower than the Iranian standard limit, significantly (P<0.05). The results of this survey indicate that nitrite residue in 20% of Mortadella & dry sausage samples and 8% of Bockwursts & cocktail sausage samples were higher than the standard limit, so it is believed that stricter preventive measuring is necessary and partial replacement of nitrate with natural preservatives is also recommended

This research performed to study the intestinal microbiology and morphology of male Japanese quails supplemented with two type of edible mushrooms including common (Agaricus bisporus) and oyster (Pleurotus ostreatus) powders. A total of 420 twenty-one day old male quail chicks were randomly allocated to seven experimental treatments. Each treatment consisted of 3 replicates of 20 birds. The birds within the control group were given the basal diet for the respective growth stage. The other six groups were fed experimental diets based on the basal diets containing 0.5, 1, and 2 percent of dried either common or oyster mushroom powders. Birds were allowed to free access to have feed and water during the 84 days of experimental period. Count of coli-form bacteria in the gut and intestinal morphological characteristics were studied at the age of 84 days. Bifidobacteria and Lactobacilli populations were significantly increased (P<0.05) by the 2% mushrooms compared to the control. Total counts (Aerobes) and Escherichia coli were significantly decreased (P<0.05) by the 2% mushrooms compared to the control. Crypt depth and papillae height in parts of 10, 50 and 70 percent's of gut were positively influenced by the supplementation of mushroom (P<0.05). Therefore it seems that mushrooms could be increased useful microflora and prove helpful in the fight against pathogenic organisms colonizing quail chickens.