Soudabeh Einafshar; Hashem Pourazerang; Reza Farhoosh; Javad Asili
Abstract
Natural materials are complicated compositions; therefore, a rapid screening of the active antioxidants is being challenged in the literature. Different polarity solvents were applied to isolate four fractions (F1, F2, F3 and F4) of methanolic extract of Cuminum cyminum. Their anti-oxidative properties ...
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Natural materials are complicated compositions; therefore, a rapid screening of the active antioxidants is being challenged in the literature. Different polarity solvents were applied to isolate four fractions (F1, F2, F3 and F4) of methanolic extract of Cuminum cyminum. Their anti-oxidative properties were tested using radical scavenging and FRAP assays. F3 (with IC50=0.006mg/mL and FRAP= 521.95 mmolFe2+/L) was significantly the most active fraction. Guided isolation through bio-autography on TLC using 1, 1- diphenyl- 2 – picryl- hydrazyl radical (DPPH) as a detection reagent led to the isolation of two antioxidant compounds from F3. F3 was injected to a preparative HPLC with the proper mobile phase (acetonitril: methanol/ water) and isolated two main compounds. These compounds were identified as Luteolin 7 glugoside and Apigenin 7 glucoside by means of 1HNMR and 13CNMR and compare them with references.
Ommolbanin Godarzi; Mostafa Mazaheri Tehrani; Hashem Pourazerang
Abstract
In recent years, water or sugar syrup, flavoring agents such as fruit juice or fruit juice concentrates and stabilizers have been added to the acidified dairy beverage composition. Nowadays, the popularity of low fat and defatted fruit yoghurt drinks are mainly growing. The purpose of this study was ...
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In recent years, water or sugar syrup, flavoring agents such as fruit juice or fruit juice concentrates and stabilizers have been added to the acidified dairy beverage composition. Nowadays, the popularity of low fat and defatted fruit yoghurt drinks are mainly growing. The purpose of this study was to diversify the acidified dairy products by determining the sensory, rheological and stability attributes of these kinds of dairy products with considering added elements and hydrocolloids as variables and then optimizing the formulation of fermented beverage, being directly flavored with the fruit concentrates. Moreover, mutual effects of total solid materials, concentrate, sweetener and stabilizer were inspected using Minitab software and response surface methodology. In this regard, consistency, viscosity, pH and acidity, sensory characteristics and yeast and mold counts were assessed. Surveys indicated that contrary to flow behavior index, the stability and straightness index increased with adding stabilizer and decreasing water content. According to sensory evaluation, white samples got lower score in comparison with black cherry ones. Furthermore, adding high amount of hydrocolloids negatively affected the total acceptance. Not only yeast but also mold was grown on the optimal sample after 28 day storage at refrigerator temperature. Generally speaking, it can be concluded that highly viscose and extremely sweet products as well as samples with high amount of stabilizer were rejected by panelists whereas the ones with high amount of concentrate were accepted. According to mentioned properties, the optimum amounts of ingredients are as follow: 13% total solid materials, 9.5% concentrate, 6.2% sweetener and 0.78% stabilizer. This sample with 2.3% of serum scored 7.93 in mouth feel, 8.25 in texture, 7.68 in acidic and 7.84 in fruit flavor, 7.89 in color, 7.78 in sweetness and 7.93 in total acceptance and also had 84.36% of total satisfaction.
Zahra Ahmadian; Mehdi Varidi; Mohammad Javad Varidi; Hashem Pourazerang
Abstract
High nutritional value and existence of bioactive components in sesame seeds converted it to a valuable food. One of the methods to increase per capita consumption is processing of sesame with different ways such as production of sesame milk. In this study, the effect of blanching time (0 as a control ...
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High nutritional value and existence of bioactive components in sesame seeds converted it to a valuable food. One of the methods to increase per capita consumption is processing of sesame with different ways such as production of sesame milk. In this study, the effect of blanching time (0 as a control sample, 15 and 30 min) at 95°C and roasting temperature (0 as a control sample and 145°C) for 20 minutes was evaluated on the physicochemical and sensory characteristics of sesame milk using completely randomized factorial design. Blanching of sesame before the milling, resulted in significant decrease of the fat content, viscosity and physical stability of sesame milk .Also, roasting of sesame seeds significantly reduced the total solid content, fat and physical stability of sesame milk, while the amount of ash and specific gravity significantly increased. The results of color analysis showed a significant increase in brightness (L *) of sesame milk from 83.864 in control sample to 88.941 with increase of blanching time to 30 minutes. Moreover the total color differences showed a significant decrease from 15.371 in control sample to 10.435 with increase of blanching time to 30 minutes. Finally, by optimization of processing, the best physicochemical and sensory properties of sesame milk achieved with blanching for 15 minutes at 95°C and roasting at 145°C for 20 minute.
Atena Pasban; Mohebbat Mohebbi; Hashem Pourazerang; Mehdi Varidi
Abstract
Enzymatic browning and formation of brown pigments are some of the most important problems in preparation of mushroom purees. In this study, the effect of some anti browning agents including sodium metabisulphite, ascorbic acid, and citric acid on the whiteness and foaming properties of mushroom purees ...
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Enzymatic browning and formation of brown pigments are some of the most important problems in preparation of mushroom purees. In this study, the effect of some anti browning agents including sodium metabisulphite, ascorbic acid, and citric acid on the whiteness and foaming properties of mushroom purees was investigated. The results showed that soaking with acids and sodium metabisulphite significantly (p
Reza Farhoosh; Hashem Pourazerang; Mohammad Hossein Hadad Khodaparast
Abstract
Measuring the rate of changes in total polar compounds (TPC) content and polar fractions, the oxidative stability of canola oil during frying process as affected by bene kernel oil (BKO, 0.05 and 0.1%) and tert-butylhydroquinone (TBHQ, 100ppm) was investigated. It was observed that the TPC content increased ...
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Measuring the rate of changes in total polar compounds (TPC) content and polar fractions, the oxidative stability of canola oil during frying process as affected by bene kernel oil (BKO, 0.05 and 0.1%) and tert-butylhydroquinone (TBHQ, 100ppm) was investigated. It was observed that the TPC content increased linearly with frying time (R2 > 0.98). The canola oil containing the BKO (especially 0.1%) was significantly capable of increasing oxidative stability. The TPC analysis by high-performance size-exclusion chromatography allowed the separation and quantification of triglyceride polymers (TGP), triglyceride dimers (TGD), oxidised triglyceride monomers (oxTGM), diglycerides (DG), and free fatty acids (FFA) during frying. The ability of the BKO to resist the TGP and oxTGM formations was near to that of the TBHQ, whereas the ability of the BKO to resist the DG and FFA formations was better than that of the TBHQ.
Elnaz Milani; Hashem Pourazerang; Shahrzad Vatankhah; Haneh Vakilian
Abstract
Inulin is widely used in functional foods throughout the world for its health-promoting and technological properties. Helianthus tuberosus is cultivated widely in the northern part of Iran. Helianthus tuberosus can be a valuable source of Inulin. To optimize conventional extraction of Inulin, various ...
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Inulin is widely used in functional foods throughout the world for its health-promoting and technological properties. Helianthus tuberosus is cultivated widely in the northern part of Iran. Helianthus tuberosus can be a valuable source of Inulin. To optimize conventional extraction of Inulin, various combinations of time, temperature, and solvent: solid ratio, were used. In this research, a series of statistically designed studies were performed to investigate the effect of each of the independent variables (temperature and pH of extraction medium, extraction time, and solvent: solid ratio). The following variables: solvent: solid ratio (5-12 v/w), temperature (40-90°C) and time (5-40 min) were studied. The central composite design (CCD) and response surface methodology (RSM) were employed as experimental design and statistical analysis. Based on canonical analysis, the optimal conditions for maximizing Inulin extraction yield (42.2%) were 76.64°C for 23.90 min and solvent: solid ratios of 12:1 (v/w).
Keywords: Inulin, Extraction, Helianthus tuberosus, Response surface methodology
Elnaz Milani; Hashem Pourazerang; Rassoul Kadkhodaee; Haneh Vakilian; Shahrzad Vatankhah
Abstract
Inulin is widely distributed throughout the plant kingdom. It has been increasingly used in various foods due to its beneficial nutritional attributes as prebiotic ingredient. The Helianthus tuberosus could be a source of inulin, but scarce studies about its extraction exist. Ultrasound has attracted ...
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Inulin is widely distributed throughout the plant kingdom. It has been increasingly used in various foods due to its beneficial nutritional attributes as prebiotic ingredient. The Helianthus tuberosus could be a source of inulin, but scarce studies about its extraction exist. Ultrasound has attracted considerable interest in food science and technology due to its promising effects in food processing and preservation. The use of power ultrasound significantly improves the extraction of organic compounds contained within the body of plants and seeds. The mechanical effects of ultrasound provide a greater penetration of solvent into cellular materials and improve mass transfer. In some cases sonication increased the efficiency of extraction at lower temperatures producing a purer product in a shorter time. It seems that the application of ultrasound would be a promising method to enhance the extraction process. The objective of this study was to develop a set of optimum extraction conditions for Helianthus tuberosus with an aim towards improving inulin extraction yield. Experiment design employed central composite design (CCD) and response surface methodology (RSM). Determination of inulin content was measured with the difference between total carbohydrate and reducing sugars. Then, Inulin extraction yield (%) was calculated too. Based on canonical analysis, the optimal conditions for maximizing inulin extraction yield (91.26%) were at 45.95 °C for 31.44 min and amplitude of 100%.
Keywords: Inulin, Extraction, Helianthus Tuberosus, Ultrasonic technique
Massoumeh Mehraban Sangatash; Hashem Pourazerang; Seyed Ali Mortazavi; Abdolmajid Maskooki; Ashraf Gohari Ardabili
Abstract
The effect of thyme and ajowan essential oils (200µg/l and 300µg/l respectivilly ) on growth of aflatoxin-producing strain of Aspergillus parasiticus on 2 stages of pistachio (green and with dry peel ) was studied . Also Organoleptic tests for evaluating odor and flavor residual of essential oils on ...
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The effect of thyme and ajowan essential oils (200µg/l and 300µg/l respectivilly ) on growth of aflatoxin-producing strain of Aspergillus parasiticus on 2 stages of pistachio (green and with dry peel ) was studied . Also Organoleptic tests for evaluating odor and flavor residual of essential oils on pistachio were also performed tested . The Collected data were statistically analyzed. The results showed that thyme essential oils at 200 µg/l had stronger effect than ajowan essential oils at 300 µg/L in terms of control the growth of Aspergillus parasiticus inspite of more thymol content of ajowan which might be as a resalts of synergistic effect between thymol and other phenolic compounds such as carvacrol in thyme. evaluation of organoleptic by 13 panelists showed that the sample which was treated by ajowan oil scored as more acceptable than the others. It was concluded that both thyme ajowan essential oils are promising natural fungistatical agents and can be used instead of currently used synthetic fungicides.
Keyword : essential oil , thyme , ajowan , Aspergillus parasiticus , pistachio
