152 research outputs found

    β-Cyclodextrin as an Ionophore for Membrane Electrode

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    This chapter included an explanation of the role of cyclodextrin as an ionophore for the preparation of voltammetric and potentiometric sensors for different compounds. There was a surveying of the different recorded cyclodextrin-based sensors for drug, organic, or inorganic cations. It also explained the performance characteristics for the first reported sensor for nickel based on β-cyclodextrin as an example

    Plasticizers and Their Role in Membrane Selective Electrodes

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    Investigation on production frozen minced fish meat and frozen fish ball from Abramis brama

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    To study the preparation of frozen minced meat from abramis brama orientalis commonly known as sim from Arras lake and from silver carp cultured in the Azerbaijan province, and later this minced meat converted to fish ball and fish burger, in this process microbial, chemical and organoleptic tests was done on samples for frozen minced meat on Sims fish the TVN was 10.1 in zero phase and 14.1 after three month and peroxide value from 0.9 t0 3.1 at the same duration. But he value was higher when converted to fish ball, TVN ranged from 14 to17.6 and per oxide from 1.1 to 4.7 after three month, the unit for TVN was mg/100gram and peroxide unit meq/1000 gram, the microbial tests was also resulted in an acceptable range, the meat of Sims fish had no significant difference with the silver carp comparatively only the color and the smell of the fish was little different, so we could conclude that we can use Sim fish meat for frozen minced meat product and this can increase the consumption of fish in the region in the future

    Monitoring of use possibility of edible films (whey protein, sodium alginate and mix of them) for cleaned kilka packaging

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    This project was carried out in order to increasing of nutritional value, taste and shelf life of cleaned Kilka Fish during cooled storage. Edible films made by Whey protein and Sodium alginate were used for fish packaging. This search carried out in two stages consisting of pre- study and study. 3, 6, 9 and 12% concentrations of Wp and 0.5, 1, 1.5 and 2% concentrations of SA at three times including 0, 2 and 4 hours were used in pre-study stage. The covered samples were kept in -18 ֯C. Microbial and sensory examination were carried out for a period of two months. Microbial factors were including total bacterial count, Staphylococcus bacteria count, Coliform, Escherichia coli and Pseudomonas bacteria. Sensory tests consist of taste, odor, color and tissue were studied in the fish samples. 12% and 0.5 % concentrations at time = 0 of edible films made by WP and SA considered in study stage. This is can be due to the significant differences in total acceptance index of sensory tests. Control sample cleaned Kilka was packaged in disposable dishes with cellophane covers in 500gr in weight. Two selected timar and mixed cover including 12 % and 0.5 % concentrations at time = 0 of edible films by WP and SA considered in study stage. The covered samples were kept in -18 ֯C. Microbial, chemical and sensory examination were carried out for a period of six months. These factors and chemical factors consisting of humidity, protein, lipid, ash, calorie, Peroxide value, free fatty acids, thiobarbitoric acid, TVN and pH were studied in test samples compared with the control samples. Coliform, Escherichia coli and Pseudomonas bacteria contamination were negative until the end of storage period in the covered samples. The mean total bacterial count and Staphylococcus bacteria counts in processed samples by WP were 2.47 and 1.61 logcfu/g, in processed samples by SA were 2.84 and 1.28 logcfu/g, in processed samples by WPSA were 2.51 and 1.44 logcfu/g, and in control samples 4.11 and 2.93 logcfu/g from 1 day until six months after processing, respectively. The mean of moisture, peroxide value, TVN, pH, free fatty acids, thiobarbitouric acid , protein, fat, ash and calorie in the covered samples by WP were 73.91%, 0.13 meq/kgoil, 9.84mg/100g, 6.15, 1.15gr/100, 0/006 mg/kg, 19.00%, 4.25%, 2.1% and 120.73 kcal/kg, in the covered samples by SA were 73.91%, 0.06 meq/kgoil, 9.84mg/100g, 6.15, 1.15gr/100, 0/006 mg/kg, 18.85%, 4.72 %, 1.90 % and 125.98 kcal/kg, in the covered samples by WPSA were 73.91%, 0.06 meq/kgoil, 9.84mg/100g, 6.15, 1.15gr/100, 0/006 mg/kg, 18.50 %, 4. 65 %, 2.25 % and 126.48 kcal/kg and in control samples 59.43%, 3.25 meq/kgoil, 16.22mg/100gr, 6.71, 9.21gr/100, 0/15mg/kg, 18.2%, 4.00%, 1.80% and 107.10 kcal/kg, respectively. No statistically significant differences were observed in the results of chemical experiments of the covered samples and presence of the meaningful difference at the results of the chemical experiments of the control sample, The covered samples by WP, SA and WPSA up to the end of storage period at cold-room had a favorite quality but the control samples had lost their. No statistically significant differences were observed in the WP samples compared with the WPSA samples (p> 0.05). Samples covered by SA had better quality compared with other samples which can be due to the presence of the significant difference in total acceptance index among covered samples without considering of economical worth

    Cardiac abnormalities due to multisystem inflammatory syndrome temporally associated with Covid-19 among children: A systematic review and meta-analysis

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    Background: Cardiac defects due to multisystem inflammatory syndrome in children (MIS-C) have been abundantly reported leading high morbidity among children affected by Covid-19. We aimed to systematically assess the incidence of such cardiac abnormalities due to MIS-C in children suffering Covid-19. Methods: The manuscript databases including Medline, Web of knowledge, Google scholar, Scopus, and Cochrane were deeply searched by the two blinded investigators for all eligible studies based on the relevant keywords. The risk of bias for each study was assessed according to QUADAS-2 tool. Statistical analysis was performed using the Comprehensive Meta Analysis (CMA) software. Results: In final, 21 articles (including 916 children) were eligible for the final analysis that all yielded good quality and none of the citation was determined to have high risk of bias. Considering studies focusing different cardiac abnormalities related to MIS-C yielded a pooled prevalence of 38.0 for significant left ventricular dysfunction, 20.0 for coronary aneurism or dilatation, 28.1 for ECG abnormalities or cardiac arrhythmias, 33.3 for raised serum troponin level and 43.6 for raised proBNP/BNP level. Conclusion: Although cardiac abnormalities among children suffering Covid-19 are uncommon, in the context of the MIS-C can be common and therefore potentially serious and life threatening. © 202

    Comparing evaluation of pin bone machinery in the Silver Carp fillet

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    Pin bone removing is a new equipment for pin-bone removal increase customer satisfaction and revenue even further the bones were pulled out at good speed. Pin boning especially is very often done manually which causes lots of global transports to low cost countries for processing new technique will help make processing operations more efficient and profitable The new generation pin bone removing equipment is mainly for trout and is not suitable for carp fishes the new pin bone remover which works with air of compressor and hand. has proved to work in almost twenty different fish species, including Great silver smelt, Pike Perch, Coho, Sockeye salmon, Atlantic Salmon, Sea Trout, Saithe, Haddock, Herring, Whitefish, Chinook, Salmon, Perch, Rainbow Trout, Char, Mackerel and Hake. Therefore it will be suitable for carp fishes too. After a day’s work all vital parts can be removed by hand without any tools, for effective cleaning to the fish and gives nice looking filets and is determined to help processors by offering state of the art bone-removing equipment which will increase speed, yield and efficiency. But pin bone removing done manually does not give a nice looking fillet also has a considerable waste of fish

    Development of technology to extract beta-carotene natural colors from Azolla (Azolla filiculoides)

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    The present project was aimed at determining the content, quality, and purity of β-carotene extracted from Azolla filiculoides in the Anzali Wetland, comparing it with synthetic β-carotene, and measuring its economic value. One treatment had β-carotene derived from Azolla filiculoides in the Anzali Wetland through the alkaline hydrolysis method in the summer of 2014. Treatments were kept at 4°C for one year. Synthetic β-carotene was used as the control. The quality of the treatments was assessed by applying some chemical tests, including the measurement of the content and quality of β-carotene, colorimetry using the Hunter-LAB method, determination of the purity and vitamin A employing high-performance liquid chromatography (HPLC), estimation of the dwell-time duration at 5°C, and measurement of the solubility of β-carotene in water. Beta carotene of Azolla in the spring extracted to alkaline hydrolysis was11853 mg/kg, in summer was 9935mg/kg, in autumn was 11256 mg/kg and in winter was 11245 mg /kg. Beta carotene of Azolla in the spring extracted to organic solvent was 8347 mg/kg, in summer was 6648 mg/kg, in autumn was 7543 mg/kg and in winter was 7539 mg/kg. The amount of beta-carotene is extracted using organic solvents and alkaline hydrolysis in the summer compared to other seasons showed a significant reduction (P0.05). The extracted amounts of beta-carotene in organic solvents compared to alkaline hydrolysis method in seasons spring, summer, autumn and winter was difference significant (P0.05). According to the harvesting Azolla of wetland is not requires special equipment and in terms of time a lot of Azolla can be harvested in a short time and also for the extraction of beta-carotene from Azolla Anzali Lagoon is not requires special equipment, too, have no economic value of raw material, does not require special conditions for growing, doubling in three days, Azolla is rich in beta-carotene, beta-carotene extraction of large quantities of small amounts of starting material, the cost of chemical materials, labor, fuel, Laboratory equipment required and the cost of importing small packages beta-carotene, beta-carotene into the country in terms of economic cost compared to the cost of imported Sigma beta carotene is economical. As shown in Table 5 in the samples prepared by alkaline hydrolysis in comparison with synthetic chemical manufactured by Sigma in terms of colorimetric tests, purity, composition and solubility of vitamins significant difference was not observed (P>0.05). But, in samples prepared by organic solvents in comparison with synthetic chemical manufactured by Sigma in terms of colorimetric tests, purity, composition and solubility of vitamins significant difference was observed (P<0.05). According to significant differences between the amount of betacarotene extracted from Azoula wetland compared to other seasons in spring and autumn and winter plant growth in spring Azoula alkaline hydrolysis method for the extraction of beta-carotene wetland and wetland Azolla is recommended

    Cold pasteurization of rainbow trout fillet (Oncorhynchus mykiss) with gamma rays and shelf life assessment at refrigerated condition

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    The present study was conducted to evaluate the effect of different doses of gamma rays on shelf life and fatty acids composition of Rainbow trout fillet (Oncorhynchus mykiss) during refrigerating condition. Quality and shelf life of non-irradiated and irradiated (0, 0.75, 1.5, 2.25, 3, 3.75 and 4.5 kGy) Rainbow trout stored at +4 C was investigated by measurement of microbiological, chemical and sensory analysis .Irradiation of fillets was performed by gamma rays from a Co60 source. Microbial counts for non-irradiated trout fillet samples were higher than respective irradiated fish. Total volatile base nitrogen (TVB-N) values was increased from 7 mg/100 g for non-irradiated to 52.7 mg/100 g after 15 days storage at refrigerator, whereas for irradiated fish lower values of 39.4, 37.6, 28.7, 25.6, 24.8 and 23.2 mg/100 g were recorded at 0.75, 1.5, 2.25, 3, 3.75 and 4.5 kGy, respectively (day 15).initial amount of peroxide value in non irradiated sampleswas 0.8 meq/kg and was increased to 7 meq/kg (7 day).Highest amount of peroxide after irradiation process was belonged to samples irradiated by 4.5 kGy (1.5 meq/kg). Also, total viable count of irradiated samples were decreased significantly (p<0.05). On nutritional aspect, results showed that total saturated fatty acid concentrations increased significantly (p<0.001) with increasing irradiation dose , so that the control sample and fish muscles that irradiated with 4.5 kGy had the lowest and highest amounts of total saturated fatty acids (20.454 ± 0.011% and 19.228 ± 0.040% , respectively). The amount of total polyunsaturated fatty acids (PUFAs) in irradiated samples were significantly lower than control sample (p<0.001) and amounts of total monounsaturated (MUFAs) were significantly higher than control samples (p<0.001). The results were indicated that the highest content of MUFAs and PUFAs were in samples irradiated with 3.75kGy (37.783± 0.092 %) and control samples (37.677± 0.104 %), respectively .The lowest level of MUFAs and PUFAs were in control samples (36.596 ± 0.024%) and 4.5 kGy (36.459 ± 0.047%), respectively. Altogether, results of this study were determined that irradiation treatment changes significantly the fatty acid composition especially polyunsaturated fatty acids in rainbow trout muscle (P<0.001). Overall, irradiation of fillet by 3.75 kGy had best results on increasing shelf life of fillet at refrigerator (between 11-15 days) and had no advers effect on fatty acid composition of Rainbo trout fillet
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