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Showing 8 results for Bakhshabadi


Volume 16, Issue 89 (7-2019)
Abstract

In this research, in order to optimize the process of extraction of oil from the peanut using ultrasound pretreatment, three levels of sonication time (0, 30 and 60 min) were used. After using these pretreatments, the oil of seeds was extracted with screw press with different rotation speeds (11, 34 and 57 rpm), then parameters including oil extraction yield, acidity, oxidative stability, peroxide, total phenolic compounds and refractive index of the samples were studied. Statistical analysis and process optimization was performed with the use of response surface methodology (RSM). The results showed that with increasing sonication time, oil extraction yield and phenolic compounds increased first and then decreased. By increasing the speed of the screw press, the amount of oil extraction yield and oxidative stability decreased, but the acidity, peroxide and total phenolic compounds increased. Increasing the sonication time also resulted in increased acidity, oxidative stability and peroxide reduction. On the other hand, it was determined that the parameters did not affect the rate of refractive index and its rate was 1.471 for all measured samples. According to the results of process optimization, it might be stated that with applying 60 minutes of ultrasound time and screw-rotation speed of the press of 21.73 rpm can provide a 0.766 utility for extracting oil from peanut.


Volume 17, Issue 105 (November 2020)
Abstract

Hawk (Crataegus spp.) is a rich source of natural antioxidants, especially flavonoids and anthocyanin, and these bioactive compounds have various beneficial effects on health and well-being. In this study, hawthorn fruits extract were prepared by ultrasound (for 30 minutes), microwave (150 s) and ultrasound- microwave (30 min ultrasound + 150 s microwave).  After applying these pre-treatments, the extract of fruits was extracted with Ethanol. A sample without any pre-treatment was selected as a control. The total phenolic content, scavenging activity of DPPH, reducing power assay, acidity and determination of important compounds (by gas chromatography / mass spectrometry) of the samples were investigated. Statistical analysis and optimization process were performed through completely randomized design using SAS software. The results showed that the use of different pre-treatments resulted in increasing the total phenolic content, scavenging activity of DPPH and reducing power in extracts. The total phenol content of sample obtained from the pretreatment of ultrasound-microwave was higher (9.89%) than control sample. The analysis of the acidity data showed that the pre-treatment type did not have significant effect on the acidity of the samples (p <0.01). The using microwave- ultrasound pre-treatment resulted in increase in the extract compounds and the bis-2-ethylhexyl-phethalate was the most detectable combination in the extracts. It was concluded, that combination of microwave and ultrasound was the best pretreatment for extraction of hawthorn fruit.

Volume 18, Issue 114 (August 2021)
Abstract

Optimization of extraction of bioactive compounds from seedless barberry fruit using pulsed electric field pretreatment
Abstract
 
In this research, in order to optimize the extraction process of Ethanolic extract of barberry fruit, the increase and optimization of the conditions for the extraction of anthocyanin's and bioactive compounds by means of intermittent electric field pre-treatment from three levels of electric field intensity (0.5, 1.75 and 3 kV / cm) and 3 levels of number of pulses (15, 30 and 45); then with ethanol solvent was used to extract their extracts and the amount of flavonoids, total anthocyanin, DPPH, total phenolic compounds, iron regeneration capacity, vitamin C and acidity compared to control (no treatment)  Was studied. The results showed that the total phenol content of the extract decreased by increasing the number of pulses and reducing the intensity of the pulsed electric field applied to the sample. The increase in the electric field strength and the number of pulses initially increased the flavonoid content, DPPH and iron ion recovery capacity, but with the increase of these variables, these three parameters decreased. Also, with increasing of these parameters, the anthocyanin level and vitamin C content increased. The acidity of the sample was reduced and then increased by increasing the electric field strength and applied pulse number. Regarding the results of the process optimization, it can be concluded that the electrical field intensity of 2.003 kV / cm and applying 29 pulses can increases the antioxidant properties of the produced product compared with the control sample.

 

Volume 19, Issue 125 (July 2022)
Abstract

In the present study, to optimize the lycopene and phenolic compounds extraction from tomato paste, pulsed electric field in different intensities including 2, 4, 6 KW. Cm-1 and different pulse numbers including 10, 30, 60 were designed and applied. Therefore the extraction efficiency of lycopene and phenolic compounds, DPPH free radical scavenging activity as well as ferric reducing activity of the extracted oil were predicted. The statistical analysis and optimization process with the use of response surface methodology were performed. The achieved results presented that with enhancements in pulsed electric field intensity, at the beginning parameters including the efficiency of lycopene extraction and phenolic compounds extraction, DPPH free radical scavenging activity and ferric reducing power increased and then showed reductions. With enhancements in pulse number, at the beginning lycopene extraction slightly decreased then showed enhancements, but the phenolic compounds extraction rate as well as DPPH free radical scavenging activity increased slightly. The achieved results of optimization process expressed that to obtain extracts with high quantities of lycopene and phenolic compounds, pulsed electric field and pulse number should be set on 3.7 KW. Cm-1 and 6 respectively to achieve the desirability value equals to 0.915. Finally the achieved results of the comparison of control sample with the treated ones expressed that,  treated sample with pulsed electric field presented higher quantities for the extracted lycopene and phenolic compounds, DPPH free radical scavenging activity as well as reducing power (111.4, 45.64, 146.28 and 73.43) compared to the standard samples.

Volume 21, Issue 153 (November 2024)
Abstract

Oxidation of fats in food greatly reduces their shelf life and causes food of unacceptable quality to be presented to the customer. In this regard, this research was conducted with the aim of increasing the oxidative stability of sesame oil with nanoliposomes containing the antioxidant extract of yarrow plant. In this study, 6 concentrations of nanoliposomes containing yarrow plant extract (0, 50, 100, 200, 500 and 1000 ppm) were used in sesame oil, and tests such as acidity, peroxide, thiobarbituric acid index, conjugate diene were performed on those oils. And after finding the best concentration of nanoliposome containing yarrow extract, this sample was compared with the sample containing the same amount of free yarrow extract and also the sample with 200 ppm BHT after 7 days of storage at 63 degrees Celsius. The results showed that with increasing storage time, acidity level, thiobarbituric acid index and conjugate diene increased, but with the increase of nanoliposome containing 500 ppm of yarrow extract, these characteristics decreased and then increased. Unlike other characteristics, the peroxide content of the samples decreased from the 5th day onwards. On the other hand, it was found that the sample containing 500 ppm of free yarrow extract had the highest level of acidity, peroxide, thiobarbituric acid index and conjugate diene. The highest oxidative stability (14.21 hours) belonged to the oil with nanoliposome containing 500 ppm of yarrow extract. The dominant fatty acid in sesame oil containing nanoliposome as well as control was linoleic acid, and the use of antioxidants did not significantly change the fatty acid profile of sesame oil. Finally, it can be stated that the use of nanoliposome containing yarrow plant extract is a suitable alternative for synthetic antioxidants available in the market.
 

Volume 21, Issue 154 (December 2024)
Abstract

Ascorbyl palmitate is a fat-soluble ester of vitamin C and palmitic acid, which is used to increase the oxidative stability of oils. In this study, in order to increase its stability to the environmental conditions of heat, humidity, oxidation and light, encapsulation technologies (nanoliposome) were used in refined soybean oil without antioxidants. In this regard, in this study, 5 concentrations of nanoliposomes containing ascorbyl palmitate (0, 50, 100, 200 and 500 ppm) were used to increase the oxidative stability of soybean oil stored at 63°C (electric oven) for a period of 16 days. Tests such as acidity, peroxide, conjugated dienes, anisidine and oxidative stability were performed on those oils. The results showed that acidity, conjugated dienes and anisidine increased with increasing storage time, but with increasing concentration of nanoliposome containing ascorbyl palmitate, the increase in these characteristics was less intense. By increasing the storage time until the 12th day, the amount of peroxide in the samples increased and then decreased, and with the increase in the antioxidant concentration, the amount of peroxide in the samples decreased. On the other hand, it was shown that increasing the concentration of nanoliposome from zero to 500 ppm in soybean oil increases the oxidative stability by about 96%. Finally, it was found that increasing the concentration of nanoliposomes containing ascorbyl palmitate in soybean oil reduces oil oxidation.
 

Volume 22, Issue 159 (May 2025)
Abstract

Dates are nutritionally rich and commercially important. Various solutions have been implemented to increase the shelf life of the product, allowing it to be available to consumers for a longer period. This study aims to use a chitosan-gelatin edible coating containing natural orange peel extract on stored dates at 4 and 25 °C for 90 days. Physical and chemical tests (weight loss, pH, acidity, moisture, reducing sugars, soluble solids, and texture) and sensory evaluations were conducted to assess the treatments over the storage period. The lowest weight loss occurred in the sample treated with the chitosan-gelatin coating containing orange peel extract on day 90 at both temperatures. Results indicated that with increased storage time and temperature, pH and moisture decreased while acidity, soluble solids, reducing sugars, and texture increased significantly. Additionally, a decrease in sensory attributes was observed with increased storage time and temperature, with samples treated with chitosan-gelatin coating containing 4 and 10 mg/ml orange peel extract showing the highest preference in sensory properties for the dates. Based on the findings, the chitosan-gelatin edible coating containing orange peel extract can be introduced as the best formulation for increasing the shelf life of dates for up to 90 days.
 

Volume 22, Issue 161 (July 2025)
Abstract

Celiac disease is caused by the consumption of gluten in genetically predisposed individuals, and the only effective treatment is adherence to a lifelong gluten-free diet. This study aimed to optimize the formulation of a sponge cake based on rice flour with the addition of tragacanth gum and date pomace. The effects of two concentrations of tragacanth gum (0 to 1.5 percent) and date pomace powder in the range of 0 to 9 percent were investigated using a mixed statistical design on parameters such as moisture, specific volume, porosity, hardness, color indicators, and sensory characteristics of the rice cake. Results showed that all tested characteristics of the cake were influenced by the mixture components (P<0.05). Increasing tragacanth gum led to higher moisture content, porosity, L* and b* index, while hardness, a* index, and overall acceptance decreased. In a manner that maximizes moisture content, the sample containing 1.5% of tragacanth gum and no date pomace powder retains the highest amount of moisture. This sample has 49.93% more moisture than the sample containing 9% date pomace powder. Increasing date pomace powder decreased moisture, specific volume, L* and b* index, and overall acceptance, but increased hardness, porosity, and a* index. The optimal formulation included 0.9% tragacanth gum, 0.25% date pomace powder, and 98.85% other ingredients, achieving a desirability of 0.854.
 

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