IRANIAN JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
Year:2020 | Volume:17 | Issue:98 |Papers Count:20

The aim of this study was to investigate the influence of different process and temperature on the chemical and sensory properties of sunflower seeds. For this reason, two types of nuts varieties of sunflower seeds from different markets (A and B) were treated with two methods ( frying and roasting) at 150, 165, 180, 195 and 210 degrees Celsius. peroxide, Iodine, saponification, anisidine, totox value, acid number and also sensory evaluation was investigate. The result showed by increasing temperature, the amount of peroxide, acidic number, saponification, anisidine and toxox value were rised. Based on the result, the highest peroxide value and unsaturated fatty acid was the roast sample B and fried sample A, respectively. The highest acidic number and saponificatoin was also found in rosted sample B at 210 ° C. Results from analysis of anisidine and totox value showed highest amount in rosted sample B. Furthermore, appearance, tender texture and flavor of fried samples at temperature 165 ° C had the highest approval rating among the test panlist. According to results of chemical properties due to lower level oxidation and chemical degradation sample A has the higher rate than sample B. Also in consideration of the sensory evaluation of samples and chemical properties, fried samples have better quality than roasted samples. Finally, fried sample A in 165 ° C was introduced as the best treatment.

Sheep tail fat is a suitable frying oil due to its good flavor and oxidation stability. This oil with its useful fatty acids can to play beneficial effect on consumer health. The refining processes of sheep tail oil, including its deodorization have high importance in the enhancement of the oil quality. Deodorization is a separation process in which a certain amount of the volatile compounds separator gas passes through the hot oil under vacuum condition and removes the volatile and odorous compounds from the oil. In this study, the ultrasound-assisted deodorization of sheep tail fat was carried out and the effects of temperature, time, and ultrasonic power on odor intensity during the deodorization process were investigated using the response surface methodology. The intensity of the odor was assessed by electronic nose and sensorial evaluation. Also, the fatty acid composition was compared before and after the deodorization process. The results of fatty acids profile showed that about 46. 72% of sheep tail oil fatty acids were saturated fatty acids (palmitic, stearic, margaric, and myristic) and the rest (53. 28%) was unsaturated fatty acids, which the majority of them was oleic acid (39. 67%). According to the results of analysis of variance, the composition and kind of the fatty acids before and after the deodorization were close together and the amount of fatty acids changed slightly during the deodorization. Finally, the optimized conditions at the temperature of 162 ° C, the time of 110 min and the ultrasonic power of 165 W were determined using electronic nose and sensory evaluation for ultrasound-assisted deodorization of sheep tail oil.

Considering the widespread use of oils in the preparation of foods, controlling the amount of ingredients in edible oils that can be problematic for human health is extremely important. Due to the complex matrix of oils, analysis of the different compounds in them is usually not possible without isolating and removing the matrix effects. In this regard, a variety of extraction and isolation methods are presented by researchers. Therefore, in this paper it has been tried to introduce in detail the most important extraction methods used in the analysis of edible oils and how they are applied.

There are different ways to reduce the risk of spoilage and increase the shelf life of agricultural products, one of which is ultraviolet (UV) irradiation. The applied ultraviolet irradiation system had seven UV-C lamps, that for microbial deactivation, the effects of lamps number (3, 5 and 7), the distance of lamps from pistachio kernels (10, 20 and 30 cm), and the UV-C irradiation time (15, 30 and 45 minutes) were evaluated. Based on Aspergillus flavus inactivation, the application of 3 lamps, the distance of 10 cm, and the irradiation time of 30 minutes were selected as the best treatment for irradiation of dry pistachio kernels. The results indicated that UV-C irradiation had no significant effect on peroxide and acid values (p <0. 05), but UV-C irradiation caused a significant (p<0. 05) increases of the total phenolic content in pistachio kernels. According to the panelists scores, the texture of irradiated sample obtained a higher score than the control sample. However, no significant difference was observed in terms of other sensory characteristics (appearance, aroma, and taste) between the irradiated and control samples.

Button mushroom has sensible to mechanical blows and has low shelf life. The purpose of this project was determining of the optimum method of ultrasonic dehydration and the effect of osmotic processing conditions on mass transfers. In the first step, sodium chloride solution with concentrations 6, 9, 12 and 15%, for 20, 40, 60, 90 and 120 minutes at 25° C and 45° C were used and in the second step, in the constant conditions of salt concentration (12%), immersion time (60 min) and temperature (45° C), the mushroom samples were subjected to ultrasonic wave in two levels (pulse duration time to pulse rest time of 1: 1 and 1: 4) at frequency of 20 KHz and constant power 400 w, to determine their effect on water loss, solid gain and water reduction. The results showed that, as the concentration of osmotic solution increased, mass transfer from the sample increased. When immersion time was increased to 60 min, solid gain and moisture diffusion increased. After this time, water loss was less increased and solid gain was more increased. Further solid gain created a resistant layer against permeability and solute movements on both sides of tissue. in this process, at temperature of 45 ° C, greater the mass transfer rate achieved, mainly due to the increase in cell permeability and permeability coefficient. It was found that salt concentration of 12%, immersion time of 60 min and temperature of 45° C gave the minimum solid gain (2. 83%) and maximum water loss (29. 36%) and weight reduction (24. 53%). Also, the use of ultrasound with pulse ratio of 1: 1 in constant osmotic dehydration condition was conducted better results. At 40 min processing time, the solid gain, water loss and weight reduction were 2. 93%, 41. 23% and 40. 30%, respectively. Moisture content of mushrooms after osmotic dehydration and ultrasound treatment reduced to 85 and 82 %, respectively.

To investigate the feasibility of enrichment of broiler breast and thigh meat using vegetable oil sources and their effect on oxidative stability of meat during storage (4oc and-20oc), the experiment using 1-old day chickens Arian commercial strain was conducted. Experimental diets have the same energy and protein content and were prepared with canola oil (containing omega-3 fatty acid) or pumpkin seed oil (containing omega-6 fatty acids) and their fatty acid profiles were determined. The chicks were fed one of two diets during the breeding period in four replicates per treatment (160 chicks per treatment). The results showed that thigh meat of broilers were fed with canola oil, significantly contained higher linolenic acid (omega 3), oleic acid (omega 9), and total unsaturated fatty acids (USFAs) and those were fed with diets containing pumpkin seed oil contained significantly (p<0. 01) higher linoleic acid, arachidonic acid (omega 6) and total polyunsaturated fatty acids (PUSFAs). The amount of linoleic acid and linolenic acid in the breast meat was not affected by the type of oil. But, oleic acid values (omega 9), ratio of USFAs / SFAs and ratio of PUSFAs / SFAs in canola oil-fed chickens and arachidonic acid (omega-6) in chickens pumpkin seed oil-fed were higher (p<0. 01). The amount of malondialdehyde (MDA) in thighs and breasts were increased during storage at refrigerated temperature. Thigh meat MDA value of canola oil-fed broiler was significantly higher at the end of storage period (p<0. 05). At freezing temperature, the oxidative stability of thigh and breast meat of broiler were fed pumpkin seed oil was significantly higher (p<0. 05). Therefore, by manipulating the combination of dietary fatty acids with vegetable oil sources, can be altered the pattern of thigh and breast fatty acids profile. During the storage period, oxidation spoilage increases in meats enriched with PUSFAs, especially omega-3 fatty acids.

The purpose of the present research was to investigate four commercial cultivars of tomato (Karoon, 3402, LS0019 and H1015) in order to determine the physicochemical attributes of the cultivar. During this investigation, fruit qualities were evaluated: Soluble solids, total solids, and moisture, pH, lycopene, β-carotene, lutein, and β-cryptoxanthin contents, color indexes (CIE a* b* L*), hue angle (h), chroma (C), total polyphenols and antioxidant activity. The amounts of total solids, a*, b*, L*, carotenoids (lycopene, β-carotene, lutein, β-cryptoxanthin), total polyphenols, and antioxidant activity (Free radical scavenging capacity, reducing power, total antioxidant capacity) remained significantly different among the investigated cultivars (p<0. 05). The results showed that the H1015 cultivar had the highest antioxidant activity and carotenoids content especially lycopene. Moreover, this cultivar had the best color indexes (highest a*) in comparison with the other cultivars, it is concluded that the H1015 cultivar is comparable to other cultivars and thus is recommended for cultivation and processing.

Today, because of the side effects of chemical preservatives, it is suggested to use natural antimicrobial compounds such as essential oils. The antimicrobial activities of essential oils are well recognized for many years. In this study, after preparation of Artemisia absinthium essential oil, its components were identified by Gas chromatography– mass spectrometry (GC-MS). Then antibacterial activity of the essential oil was evaluated against Staphylococcus aureus, Escherichia coli, Salmonella typhi and Bacillus cereus by agar disk-diffusion, MIC and MBC methods. Based on MIC results, essential oil concentrations of 16, 32 and 64 (μ l/ml) were selected to evaluate its efficacy in inactivating the growth of pathogenic bacteria on fresh lettuce. Lettuce was inoculated with Staphylococcus aureus, Escherichia coli, Salmonella typhi and Bacillus cereus and the bacterial count were enumerated at time intervals (0, 3, 24, and 72 h). The concentration of (Z)-β-Ocimene oxide as the major component of the essential oil was 76. 53± 2. 36%. The results of MIC, MBC values and agar disk-diffusion showed that the most sensitive and the most resistant bacteria were Staphylococcus aureus and Escherichia, respectively. Compared to control (water), lettuce treated with 64 μ l/ml essential oil at 72 h after treatment showed an up to 3. 36, 2. 27, 3. 23 and 3. 47 log CFU/g reductions in Staphylococcus aureus, Escherichia coli, Salmonella typhi and Bacillus cereus, respectively. This research showed that Artemisia absinthium essential oil may be an effective antimicrobial agent to the control of pathogenic bacteria growth on fresh lettuce.

Gamma-aminobutyric acid orGABA is a non-protein functional amino acid. It functions as an inhibitory neurotransmitter that is involved in the regulation of cardiovascular functions, such as blood pressure and heart rate and also plays role in the sensations of pain, anxiety, stimulation of insulin secretion from the pancreas and preventing diabetes. Fermentation and germinating of cereal grains are of biosynthetic methods for GABA production. This study aimed to investigate the production of GABA enriched yogurt by using ofLactobacillus sakeiand brown rice malt extract. In this regard, brown rice malt extract was added to low-fat milk in 0, 50, 75 and 100 ml quantities and set yogurts were produced after addition of skimmed milk powder and inoculation of commercial yogurt starters andLactobacillus sakei, then the concentrations of GABA, phenolic compounds, amino acids, the antioxidant capacity, and sensorial characteristics were evaluated. According tothe results, yogurts that were produced by brown rice malt extract contained GABA. The highest GABA content (5. 62 mg/100 g d. w) was observed in yogurt with 100 ml brown rice malt extract. Using brown rice malt extract and Lactobacillus sakeicaused significant increasing (p≤ 0/05) of phenolic compounds and their antioxidant capacities in yogurt samples compared to control. In amino acid profile analysis, glutamic acid showed the highest concentration and lysine was the highest among essential amino acids. In sensory evaluation tests, the sample with 50 ml brown rice malt extract, had the highest overall acceptability. Regarding to the results, production of GABA enriched functional yogurt containing phenolics and antioxidant compounds by using of brown rice malt extract and fermenting with Lactobacillus sakeiand general yogurt starter cultures is feasible.

Drying of food products using microwave can be a good replacement to hot air dryers. In this study, Response Surface Methodology (RSM) was used for optimization of the conditions for microwave drying of persimmon slices. The effects of microwave power (300, 500 and 700 W) and slice thickness (3, 5 and 7mm) as independent variables on shrinkage percentage, processing time and total color change of persimmon as dependent variables (responses) were evaluated. All process variables were statistically significant as quadratic regression models for all responses. As microwave power increased, the shrinkage percentage and total color change of persimmon slice increased but processing time decreased. As the thickness of persimmon slice increased, the processing time and total color change of persimmon slice increased but shrinkage percentage decreased. The optimum conditions obtained for minimum shrinkage percentage, processing time and total color change were 3 mm as slice thickness and the microwave power of 312 W. In optimized condition, the shrinkage percentage, processing time and total color change of dried persimmon slices were 72. 5 %, 5. 97 min and 15. 2, respectively.

Chicken meat is one of the most popular and perishable foods. One of the effective ways to increase the retention time of fresh chicken meat is the use of appropriate packaging coatings containing natural antimicrobial compounds. The aim of this study was to investigate the antimicrobial effect of soy protein coating containing tarragon essential oil on chicken meat stored in a refrigerator. Tarragon essential oil was extracted by water distillation method and its antimicrobial properties were tested on Staphylococcus aureus PTCC 1113, Salmonella enterica PTCC 1709, Escherichia coli PTCC 1399, and then the effect of concentration 0, 2 and 3% (vol / vol) soluble essential oil in soybean protein coating on these bacteria were studied. Finally, the antimicrobial effect of soy protein content containing tarragon essential oil on chicken fillets kept in the refrigerator was investigated and characteristics of the changes in its chemical and organoleptic properties were evaluated. The highest inhibitory concentration of essential oil was from Staphylococcus aureus, and the lowest was E. coli and Salmonella enterica. The total microbial count for the sample treated with 3% essential oil during the 12 days storage in the refrigerator was significantly lower than the control sample (P <0. 05). The greatest effect of antimicrobial films after 12 days of storage in the refrigerator was on inoculated samples of Staphylococcus aureus. Protein film of 3% essential oil prevented the increase of pH and peroxide value during the storage period in the refrigerator. According to the sensory evaluation results, the film containing 2% essential oil obtained the highest overall acceptance rating. Although this property is reduced by the mixing of essential oil with film coating. The essential oil coating also has positive effects on the chemical and organoleptic properties of chicken fillet.

In this study, the effect of storage period on some characteristics of synbiotic ultrafiltratedwhite cheese (SC) as compared withtwo non-probiotic (NPC) and probiotic cheese (PC) samples were evaluated. SC with optimized formulation as: 0. 43 microbial transglutaminase enzyme (U/g protein), 8. 24% demineralized whey powder solution (34% T. S. substituted with retentate) and 0. 71% inulin wasproduced. Lactobacillus acidophilus LA5 was used as probiotic bacteria. Cheese samples were evaluated for color indexes, texture profile analysis (hardness, adhesiveness, cohesiveness, springiness, gumminess and chewiness) and total acceptance duringa two-month storage period (3, 15, 30, and 60 days) under refrigeration conditions. Results of texture profile analysis of cheese samples showed that except for springiness, all texture values of SC sample during the storage intervals were significantly (p<0. 05) higher than NPC-and PC-control cheeses. Although SC sample had the higher springiness than other cheeses, it was not significant (p>0. 05). The hardness, gumminess and chewiness values of the all cheeses until 30 days of storage were increased and thereafter decreased significantly (p<0. 01). In terms of color indexes, SC samples had the higher L* values than other cheeses but no difference in relation to a* and b* parameters were determined. decreasing trend and a decreasing and increasing trend respectively. Furthermore, during the storage period, L* value of all cheese treatments were meaningfully (p<0. 05) decreased. Based on the results of evaluatedparameters, SC sample had a higher cheese quality than two control cheeses after two months of coldstorage.

Sardasht black grape (Vitis Viniferae cv. Rash) is one of the most important grape cultivars in west Azerbaijan province in Iran that mainly used for grape juice production. Black grape residues are a cheap source of bioactive compounds. In this research ultrasound-assisted (UAE) and maceration extraction (ME) were applied for bioactive compounds extraction of Sardasht black grape residues. A central composite design was used to obtain the optimal conditions of UAE and ME; the effects of operating conditions (temperature and time) on phenolic compounds, anthocyanin content and antioxidant activity were studied through response surface methodology (RSM). Optimized conditions were as follows: extraction time was 24 h, and temperature was 35° C for ME and 55° C and 15 min for UAE. Under these conditions the phenolic compounds, anthocyanins and antioxidant activity obtained by ME and UAE methods were 96. 779 mg GAE/100 ml, 118. 345 mg/L, 55. 49% and 114. 115 mg GAE/100 ml, 121. 645 mg/L, 64. 89%, respectively. This study provides evidence that UAE is an effective technique for the extraction of bioactive compounds from Sardasht black grape residues.

One of the new methods for extracting natural antioxidants from plant tissues is ultrasound extraction. In this study, the method of extraction of bath ultrasound with ethanol-water solvent (50: 50) and (80: 20) at a temperature of 30 and 40 ° C and 10 and 20 minutes was used to extract the extract of the leaves of the zoo. Became The total phenolic and flavonoid compounds, DPPH and antioxidant potency in beta-carotene-linoleic acid model of each extract were measured by spectrophotometric method and antioxidant activity of the extracts by oxidative stability index (OSI). Based on the results, The extract (80-40-20) with the highest effective compounds had the highest phenolic compounds (193. 3 ± 5. 53) mg/g extract per gram of extract) and flavonoid (40. 63± 2. 36 mg / 40 mg quercetin in Gram of extract) and the highest amount in antioxidant assays (DPPH radical inhibition and beta-carotene-linoleic acid coloration assay) and the lowest I C50 showed the best antioxidant performance. In the Ransted test, treatment (80-40-20) with a concentration of 200 ppm showed the highest oxidative stability of canola oil. Therefore, the most suitable treatment was to obtain the best treatment result (80-40-20) was selected.

Sesame is one of the most consumed oilseeds that despite being rich in mineral salts, contains some antinutritional compounds that are limiting nutrients to the body. Therefore, the aim of this study was to investigate some of the antinutritional compounds (oxalate and phytate) and heavy metals (lead and cadmium) in sesame oil, raw and peeled sesame seed (Sesamum indicum L. ) of two varieties; Dashtestan 2 and Darab 14; Cultivated in Iran. Sesame seed samples were collected from Seed and Plant Certification and Registration Institute in Karaj, iran. Oxalate and phytate were determined using High Performance Liquid Chromatography (HPLC) methods and Pb, Cd, Ca, Mg, Fe, Zn and Mn were determined using atomic absorption pectrophotometry (AAS). The lead content of all samples is higher than the maximum permissible level and their cadmium content is below the maximum permissible standard in Iran. The Darab variety contains more phytic acid and the Dashtestan variety has higher oxalic acid content. Most of the minerals in the samples are calcium. The oil extracted from the raw sesame seeds lacks phytic acid and contains about 2. 5 mg/Kg oxalic acid. The raw sesame seeds have some anti-nutritional compounds that significantly reduces by peeling, while the amount of these compounds in sesame oil is much lower than the standard Iranian and Codex. Therefore, it is better to evaluate its quality before using raw sesame seeds.