Showing 25 results for Mehrnia
Volume 3, Issue 4 (Fall 2023)
Abstract
The issue of "Bildung" has been considered more than anyone else in Hegel's philosophical thought. He has focused more on this issue in the Phenomenology of the Spirit and Elements of the Philosophy of Right books, and the Nuremberg Speeches. In this article, two central points in Hegel's thought have been emphasized: a) the necessity of distinguishing between different types of "theological-ethical", "natural-anthropological", "political" Bildung, and finally the Hegelian "cultural-historical" Bildung; And then removing the accusation from the Hegelian system, about trying to remove God and the theological view from the Bildung concept; b) Proving that, according to Hegel, the process of education includes "nature", "individual" and "human society" at the same time, and contrary to popular opinion, it will not be limited to the human individual. Therefore, when discussing awareness, freedom, alienation, and the like, he actually explains the formation of education in these three fields.
Volume 14, Issue 2 (5-2014)
Abstract
Solar field transfer heat of solar radiation to the heat transfer fluid. Appropriate size of solar field is one of the most important parameters in levelized cost of solar electricity. In this paper optimum solar field size in an integrated solar combined cycle is determined. Furthermore, an algorithm is presented for the simulation of parabolic trough solar collector performance. Four solar fields by different size but same power block are considered. Thermal performance of each field in terms of nominal and partial load conditions is studied. Solar field and combined cycle are simulated by coding in EES software. According to The hourly meteorological data, electricity generated for a year is calculated. Levelized cost of solar electricity for each field size is calculated and optimum size of the field is selected. According to the economic analysis, the optimum solar field size in an integrated solar combined cycle is depended to location of plant, HRSG power demand, and the constraints of the power block and solar field.
Volume 16, Issue 90 (August 2019)
Abstract
In this study, the antimicrobial effect of Ocimum basilicum essential oil with different qualitative and quantitative methods (disc diffusion, minimum inhibitory concentration and minimum bactericidal concentration) as well as the effects of its interaction with tetracycline and chloramphenicol antibiotics on Listeria innocua, Staphylococcus aureus, Bacillus cereus, Pseudomonas aeruginosa and Escherichia coli were evaluated. The chemical compounds, antioxidant activity and total phenolic content of Ocimum basilicum essential oil were measured. The results showed that Ocimum basilicum essential oil contained 31 compounds. Estragole was the major constituent of the essential oil with a percentage of 30.75. The antioxidant activity of Ocimum basilicum essential oil was 70% based on free radical scavenging capacity (DPPH). The total phenolic content of the essential oil was 29.05±0.50 mg GAE/g. The most sensitive and the most resistant bacteria with diameter inhibition zone 21.95 mm and 10.00 mm were Bacillus cereus and Escherichia coli respectively. The effects of interaction of Ocimum basilicum essential oil with tetracycline and chloramphenicol antibiotics on gram negative bacteria showed synergistic status. The minimum inhibitory concentration of the essential oil was equal to 12.5, 6.25, 6.25, 200 and 200 mg/ml for Listeria innocua, Staphylococcus aureus, Bacillus cereus, Pseudomonas aeruginosa and Escherichia coli respectively. The minimum bactericidal concentration of Ocimum basilicum essential oil was equal to 50, 12. 5, 12.5, 400 and 400 mg/ml for bacteria respectively.
Volume 16, Issue 91 (September 2019)
Abstract
In this study, Antibacterial activity of garlic essential oil used by disk diffusion method, micro-dilution broth (minimum inhibitory concentration) and minimum bactericidal concentration (MBC) on a number of pathogenic strains (Pseudomonas aeruginosa, Escherichia coli, Listeria innocua and Staphylococcus aureus) was studied in vitro. Chemical compounds of garlic essential oil were identified by gas chromatography. The antioxidant potential, total phenol and flavonoid were determined using radical reduction capacity, Folin–Ciocalteu and aluminum trichloride colorimetric, respectively. The results showed that the minimum inhibitory concentration of garlic essential oil was 128, 128, 32 and 64 mg/ml for Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus and Listeria innocua respectively. By increasing the concentration of essential oil, the diameter of the inhibition zone increased. The highest inhibition zone with 31.70 ± 0.55 mmm diameter was due to Staphylococcus aureus. The results showed that gram-negative bacteria of Escherichia coli and Pseudomonas aeruginosa were the most resistant to garlic essential oil. The results of identification of the chemical compounds of garlic essential oil showed that the combination of di-allyl disulfide was 40.3% higher. Total phenol, flavonoids and antioxidant activity of garlic essential oil was 0.33 mg gallic acid in gram, 0.24 mg quercetin in grams and 80% respectively. The results of this study showed that garlic can be used as a potential source for the production of pharmaceutical compounds.
Volume 16, Issue 95 (January 2019)
Abstract
Due to detrimental effects of synthetic antioxidants, application of natural antioxidants which mainly are extracted from botanical sources, in addition to stabilizing food products will reduce undesirable effects of free radicals and synthetic antioxidants. In this research effect of drying methods and solvent type were evaluated on chemical composition and antioxidant activity of sacred fig. at first fruits were dried in oven (40 and 60 °C) and microwave (400 and 700 W) and two solvents of methanol and ethanol were used for extraction. Total phenol and flavonoid content were measured with folin ciocalteu and aluminum chloride methods respectively. Antioxidant activity were measured using DPPH and ABTS methods. Results showed that the lowest IC50 value was for 60 °C oven and methanol solvent (150.11 ppm for DPPH and 222.9 ppm for ABTS) and the highest value was observed in 400 W microwave and ethanol solvent (455.145 ppm in DPPH and 500.1 ppm for ABTS). The highest total phenol and flavonoid content was seen in extract of 60 °C and methanolic solvent (1032 mg GAE/g extract and 63.31 mg QE/g extract).
Volume 16, Issue 97 (March 2020)
Abstract
In traditional medicine, Mentha pulegium was used for sinusitis treatment, gastrointestinal disorders, respiratory disorders and food detoxity. In this research, Mentha pulegium essential oil (MPEO) antibacterial activity on some foodborne pathogens was considered. For research on MPEO interaction with chloramphenicol and gentamicin antibiotic, sub-minimum inhibitory concentration was used. The results showed that in growth medium MPEO able to control pathogen microorganisms. The inhibition zone diameter (IZD), in disk diffusion method for Listeria innocua, Staphylococus aureus, Escherchia coli, Salmonella typhi, Pseudomonas aeruginosa bacteria was 16/50, 14/60, 10, 14, 10 mm respectively. The mean of IZD in well diffusion method for Listeria innocua, Staphylococus aureus, Escherchia coli, Salmonella typhi, Pseudomonas aeruginosa bacteria was 14/40, 16, 12, 14/30, 10, 10/10 mm respectively. The results showed that in combination of MPEO with gentamicin antibiotic, for all bacteria, synergistic was observed. In combination of MPEO, with chloramphenicol antibiotic in Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, synergistic state was observed. Minimum inhibitory concentration in MPEO for all bacteria was 6/25 mg/ml. In general, with regard to acquired results, one can use MPEO for pathogenic microorganisms growth control in foods.
Volume 18, Issue 112 (May 2021)
Abstract
Resistance of microbial strains to antibiotics and controlling food safety are two of greatest global problems. In this research phenolic content, flavonoids, antioxidant capacity and antibacterial properties of Sclerorhachis platyrachis essential oil were evaluated. Phenolic content and flavonoids of Sclerorhachis platyrachis essential oil were measured using Folin ciocalteu method and aluminum chloride colorimetric method respectively. Antioxidant capacity evaluated using DPPH, ABTS and β-carotene bleaching assay. Agar well diffusion, agar disk diffusion, minimum inhibitory concentration and minimum bactericidal concentration were used to evaluate antibacterial activity of essential oil against some pathogens. Results showed that total phenolic content and flavonoid of Sclerorhachis platyrachis were 55.63 mg GAE/g and 62.28 mg QE/g respectively. Antioxidant capacity using DPPH, ABTS and β-carotene bleaching assay were 52.39, 68.3 and 49.95 percent respectively. In disk diffusion method the highest and lowest zones were 16.2 and 9.7 mm, belonged to Staphylococcus aureus and Enterobacter aerogenes respectively. In all strains MBC was higher than MIC and Gram-negative bacteria were more resistant to essential oil. Sclerorhachis platyrachis essential oil showed favorable antibacterial and antioxidant capacity and its usage will inhibit growth of pathogenic bacteria.
Volume 18, Issue 113 (july 2021)
Abstract
Today, increasing attention is paid to natural antioxidants and preservatives, including plant extracts. The aim of this study was to identify the functional groups of bioactive compounds, antioxidant activity, total phenol and total flavonoids of ethanolic, aqueous and hydroalcoholic extracts of red bell pepper. Red bell pepper extracts were extracted using ethanol, water and a mixture of water and ethanol (50-50%), respectively. Factor groups were qualitatively identified and investigated by Fourier transform infrared spectroscopy (FTIR). Total phenol was calculated using Folin-Ciocalteu reagent and the number of total flavonoids was calculated by aluminum chloride colorimetry. The antioxidant activity of red bell pepper extracts was evaluated by DPPH and ABTS free radical scavenging tests and the decay of color of beta-carotene/linoleic acid. The presence of C-C and OH groups of polyphenolic compounds of red bell pepper extract was confirmed by FTIR. The phenols of ethanolic, aqueous and hydro-alcoholic extracts of red bell pepper were equal to 22.68, 19.50 and 20.80 mg GAE / g, respectively. The flavonoid content of ethanolic, aqueous and hydro-alcoholic extracts were calculated to be 39.30, 29.28 and 33.70 mg QE / g, respectively. Antioxidant capacity of red bell pepper extracts based on radical scavenging activity of DPPH, ABTS and decay of color of beta-carotene/linoleic acid, 53.39, 59.38 and 56.88 percent for ethanolic extract, 46.37, 51/28 and 48/20 percent for aqueous extract and hydro-alcoholic extract were 51, 57.66 and 49.60 percent. According to the results, it seems that ethanolic, aqueous and hydroalcoholic extracts of red bell pepper can be used as antioxidants and natural preservatives in the food industry to prevent oxidation of food products.
Volume 18, Issue 119 (january 2021)
Abstract
The aim of this study was to determine the functional groups and qualitative identification, the amount of phenolic and flavonoid compounds, antioxidant and antimicrobial activity of Lavandula stricta essential oil. Essential factor groups were determined by Fourier transform infrared (FTIR) spectroscopy in the wavelength range of 500–4000 cm-1. Total phenols and flavonoids were measured by Folin-Ciocalteu and aluminum trichloride colorimetry, respectively. Antioxidant activity was also determined by two methods of free radical scavenging DPPH and ABTS. The peaks observed in Lavandula stricta essential oil confirmed the presence of O-H, C-H, C=O, C=C, C-C and C-O functional groups of bioactive compounds. The amount of phenol and flavonoids in total essential oil was 68.60±0.68 mg GAE/g and 19.10±0.52 mg QE/g, respectively. Antioxidant activity was also obtained based on the percentage of free radical scavenging DPPH and ABTS equal to 59.50±0.63 and 67.68±0.53, respectively. The antimicrobial activity of essential oil was evaluated by four methods: disk diffusion, agar well, minimum inhibitory concentration and minimum bactericidal concentration. The results of measuring the antimicrobial activity of essential oil by disk diffusion and agar well showed that Gram-positive bacterium Staphylococcus aureus is the most sensitive strain to Lavandula stricta essential oil. The minimum inhibitory concentration of essential oil for Salmonella typhi, Pseudomonas aeruginosa, Listeria innocua, Staphylococcus aureus and Escherichia coli was equal to 3.125 mg/ml and for Bacillus cereus it was equal to 6.25 mg/ml. The minimum bactericidal concentrations for Listeria innocua, Pseudomonas aeruginosa and Salmonella typhi was equal to 100, 200 and 400 mg/ml, respectively, and for other bacteria (Staphylococcus aureus, Bacillus cereus and Escherichia coli) it was more than 400 mg/ml.
Volume 19, Issue 122 (April 2022)
Abstract
Edible oils are exposed to physicochemical changes during heating, cooking and frying. Due to the high importance of this issue and the public perception of the health of oils prepared in oil shops in the city, this study was conducted to evaluate and compare the thermal stability of sesame oils prepared by shop and industrial press. Sesame oil samples were prepared from four lubrication centers in Ahvaz and their stability during 12 days during the thermal process with tests, acid number, peroxide, anisidine, Totex and iodine to evaluate the oxidative stability and also measure the composition of fatty acids with The use of gas chromatography was performed and evaluated according to Iranian national standards. The results showed that linoleic acid (C18: 2)
Level (41.5-42.7)
Percentand and oleic acid (C18: 1) Level (38.5- 39.47) Percentand of the maximum fatty acids in sesame oils were studied which The fatty acids of all samples were in the range specified by the National Standard of Iran. The results of acid, iodine, peroxide, anisidine and totex tests all showed a significant difference between the sample of industrially prepared sesame oil and other oils prepared by shop press method and the better performance of industrial oil at a significant level Showed 5%. By interpreting the data and results, it can be found that sesame oils prepared by industrial method have higher thermal stability than oils prepared by shop press method and are more suitable for thermal applications.
Volume 19, Issue 122 (April 2022)
Abstract
Nowadays, due to the proven adverse effects of synthetic antioxidants, much research has been done on using natural antioxidants, including natural extracts and essential oils, in the production of foods. One of these natural compounds is turmeric, which has traditionally been widely used in the food and pharmaceutical industries and is known as a functional food. in this research effect of turmeric essential oil on oxidative stability of soybean oil was evaluated. Turmeric essential oil was extracted using Clevenger apparatus. Different concentrations of turmeric essential oil were compared with synthetic antioxidant TBHQ during oxidation process of soybean oil for 14 days at 70 °C and peroxide value, acidity, iodine and anisidine value were measured. results showed that with increasing the concentration of turmeric essential oil, the amount of oxidation was significantly reduced. The highest antioxidant capacity were seen in samples containing 1000 ppm essential oil. Our research showed that turmeric essential oil could be used as effective natural antioxidant in oil industry.
Volume 19, Issue 130 (December 2022)
Abstract
The use of local products in the food industry has become increasingly important in recent years, and jujube fruit is one of the most important garden products in South Khorasan. The high potential of jujube fruit due to the presence of antioxidant and antimicrobial compounds can be used as an alternative to some of the industrial antioxidants in the field of edible oils. In the present study, the compounds in jujube fruit including meat and kernels were investigated. First, in order to extract jujube extract with better properties and efficiency, two types of aqueous and methanolic solvents were used.
. Then jujube extract at three concentrations of 250, 500 and 1000 parts per million was compared with BHA industrial antioxidant. The results indicate the presence of phenolic compounds, alkaloids, saponins, sterols, tannins, terpenoids and steroids. On the other hand, it was observed that jujube extract had antimicrobial properties against Salmonella typhi, Bacillus subtilis, Listeria monocytogenes, Aspergillus nigero Candida albicans.
Comparing the antioxidant properties of jujube extract with industrial antioxidant BHA, it was observed that jujube extract had less antioxidant activity and had lower peroxide, acid number, thiobarbituric acid index and DPPH (P> 0.05); But as an alternative, it can help prevent oil oxidation


Volume 19, Issue 130 (December 2022)
Abstract
Nowadays, by proving the harmful effects of synthetic antioxidants on human health, food scientists are seeking natural compounds to replace synthetic antioxidants. In this study antioxidant properties of Bene (Pistacia atlantica) oil in stabilizing crude soybean oil were investigated. Treatments were prepared by blending different ratios of Bene oil with soybean oil (1, 3, and 5%w/w) and synthetic antioxidants of TBHQ (100 ppm) and BHT (200 ppm) along with the antioxidant free soybean oil were used as a control to monitor stability at accelerated oxidation conditions (70 °C). At different time intervals (2 to 12 days), peroxide value, acid value and thiobarbituric acid of samples were evaluated. Fatty acid profile of Bene oil was analyzed using gas chromatography and its total phenolic content and antioxidant properties were measured using Folin-Ciocalteu and DPPH methods, respectively. Results showed that the predominant fatty acid in Bene oil was oleic acid (% 56.53) and Free Radical scavenging activity and total phenol content were 64.7 ± 2.6 % and 87.3 ± 4.5 μg/mg, respectively. Accelerated oxidation test showed that antioxidant properties of 5% Bene oil containing samples were comparable with BHT samples. Generally, the results of this study showed the ability of Bene oil in retarding the oxidation of crude soybean oil.
Volume 19, Issue 131 (January 2022)
Abstract
Food gums are additives that play variety of roles such as consistency, gel formation, and stabilizing in food solutions. In this study, the best conditions for extracting Quince seed gum as well as its antioxidant and physicochemical properties were investigated. Extraction of gum was optimized using microwave power (250 -850 W), water to grain ratio (20-60) and time (2-9 min), by the response surface methodology. Gum physicochemical properties including ash, moisture, protein and fat were measured and antioxidant properties were evaluated by DPPH, ABTS, FRAP and β-carotene/linoleic acid bleaching assay. The extraction efficiency was in the range of 8.9% to 15.2%. As the microwave power increases in constant time, gum extraction efficiency increases, but the simultaneous power increases with increasing treatment time, resulted in decreasing gum extraction. Increasing time by keeping the power constant, initially resulted in an increase in extraction and afterward resulted in lower gum extraction. Results of scavenging capacity and antioxidant properties measured using DPPH, FRAP, ABTS and beta –carotene bleaching assay were 53.19 μg/ml, 1.06 μg/ml, 69.61 μg/ml, 2.92 μg/100g respectively, and the amount of total phenol and flavonoids were 74.66 mg GAE/g and 670.21mg QE/g respectively.
Volume 20, Issue 143 (January 2023)
Abstract
Calotropis procera from the Apocynaceae family is called Stabregh in Iran. This plant is found in tropical areas and southern coasts in Iran and North Africa, Middle East Asia, and Southeast Asia on coastal sand dunes. In this study, the C. procera extract was separated using water solvent. The antifungal effect of C. procera aqueous extract on Alternaria alternata, Alternaria solani, Saccharomyces cerevisiae, and Fusarium solani was investigated. The antifungal activity was evaluated through, disk diffusion agar (Kirby-Bauer), well diffusion agar, minimum inhibitory concentration (MIC), and minimum fungicidal concentration (MFC). In the combined mode (interaction) of C. procera aqueous extract with nystatin antibiotic was investigated. In general, Saccharomyces cerevisiae and Alternaria solani were the most sensitive and resistant fungal strains with the highest and the lowest diameter of inhibition zone, respectively. So that the diameter of the inhibition zone for Saccharomyces cerevisiae and Alternaria solani in the presence of 80 mg/ml extract concentration was equal to 13.20 and 8.20 mm, respectively. In the interaction of C. procera aqueous extract with nystatin antibiotic, synergistic mode was observed for all fungal strains. The MIC and MFC values for S. cerevisiae were 32 and 128 mg/mL, respectively. The MIC and MFC results for Alternaria solani were found to 256 and > 512 mg/mL, respectively.
Volume 20, Issue 145 (March 2024)
Abstract
Nowadays, with the increase in diseases and consumers’ preference for organic foods, the use of natural plant compounds to improve and increase their shelf life is on the rise. In addition, the use of medicinal plants, which can have therapeutic properties, has attracted attention. Black seed oil has attracted a lot of attention in the past due to its unique therapeutic properties. The aim of this study was to investigate the antioxidant activity and evaluate the antimicrobial activity of black seed oil against Escherichia coli, Pseudomonas aeruginosa, Salmonella typhi, Staphylococcus aureus, Listeria monocytogenes and Bacillus cereus. The amount of phenolic compounds in black seed oil was measured by Folin-Ciocalteu. The antioxidant activity was determined by DPPH and ABTS radical scavenging methods. The antimicrobial effect of Nigella sativa oil was investigated according to well diffusion agar, disk diffusion agar, interaction, minimum inhibitory concentration and minimum bactericidal concentration methods.The Nigella sativa oil had 16.25 mg GAE/g phenolic compounds. The antioxidant activity based on DPPH and ABTS radical scavenging were 86.62% and 94.85%, respectively.The Nigella sativa oil showed a significant antimicrobial effect on the tested microorganisms. In the combined mode (interaction) of Nigella sativa oil with chloramphenicol antibiotic, synergistic mode was observed for all bacterial strains. Given the significant antioxidant activity and antimicrobial effect of Nigella sativa, it can be used in food and pharmaceutical industries.
Volume 20, Issue 145 (March 2024)
Abstract
The yoghurt fortification with bioactive-rich components is one of numerous approaches to prevent the diseases correlated with nutritional shortages. However, this method may alter product characteristics. Therefore, the aim of current research was to study the effect of bell pepper extract (BPE) with three different colors on the sensory and microbial properties of set yogurt. For yogurt preparation, 5% of concentrated BPE with the yellow, orange, or red colors were substituted with the milk used for yogurt production. Results showed that by using BPE in yogurt formulation, the count of starter bacteria increased meaningfully while for sensory attributes, except for yogurt texture and appearance, the scores of taste and color were significantly decreased (p<0.01). The mean viable counts of lactic acid bacteria (LAB) for control and yogurt samples containing yellow, orange and red BPE were determined as 9.62, 10.09, 10.08 and 10.10 Log CFU/g, respectively. The time of storage also had significant impact on the yogurt properties and as the time of storage increased, the count of LAB and sensory scores reduced notably. Results revealed that although addition of BPE with different colors into the yogurt formulation led to inferior scores of sensory characteristics (taste and color), all the yogurts containing BPE had acceptable sensory scores (mean scores>7, i.e. good mark). Consequently, with respect to the healthy components of bell pepper extracts, a yogurt with appropriate functionality could be produced. Therefore, the use of BPE with different colors (particularly orang BPE) in production of functional yogurt is recommended.
Volume 21, Issue 154 (December 2024)
Abstract
German chamomile (Matricaria chamomilla L.) is a well-known medicinal plant that is distributed worldwide and is widely used in traditional medicine for the treatment of various diseases. In this study, the essential oil of M. chamomilla was extracted by water distillation method and its total phenol content, total flavonoid content, antioxidant activity, and antimicrobial effect were investigated. The total phenol content of the essential oil was 39.70 mg GAE/g and its total flavonoid content was 18.80 mg QE/g. The antioxidant activity of the essential oil was evaluated based on two methods of inhibiting free radicals DPPH and ABTS; the essential oil was able to inhibit free radicals DPPH (58.60 %) and ABTS (61.60 %). The antimicrobial effect of the essential oil against Bacillus cereus, Streptococcus pyogenes, Staphylococcus aureus, Shigella dysenteriae, Enterobacter aerogenes, and Salmonella typhimurium was investigated by disk diffusion agar, well diffusion agar, minimum inhibitory concentration, and minimum bactericidal concentration. The findings of the antimicrobial activity of the essential oil by the disk diffusion agar and well diffusion agar, showed that S. pyogenes and E. aerogenes were the most sensitive and resistant microbial strains to M. chamomilla essential oil, respectively. The results of this study showed that the essential oil of M. chamomilla has shown strong antioxidant and antimicrobial activity, which can be a potential candidate for the preparation of antioxidant and antimicrobial drugs.
Volume 21, Issue 154 (December 2024)
Abstract
The crucial role of food in life has prompted a shift towards products that not only offer good quality and nutritional properties but also ensure the overall health of consumers. Probiotics, which are non-pathogenic microorganisms, can restore intestinal microbial balance when consumed in sufficient quantities. In this study, Limosilactobacillus fermentum ARD2 isolated from local yogurt was investigated for its probiotic properties. Various aspects of this strain were evaluated, including acid resistance (at pH levels of 2, 3 and 4), resistance to bile salts (at concentrations of 0.3, 0.5 and 0.7 %), antimicrobial activity using disk diffusion agar and well diffusion agar methods, resistance to common therapeutic antibiotics, evaluation of antioxidant activity, cell surface hydrophobicity, DNase enzyme activity, hemolytic activity, and biogenic amine and cholesterol absorption. The results of the acid resistance tests indicated that the viability of L. fermentum ARD2 increased as pH levels rose from 2 to 4, with a decrease observed over time at a constant pH over 3 hours. Growth was inhibited with increasing concentrations of bile salts. Antimicrobial testing revealed that the acidic and neutralized cell-free supernatant (aCFS and nCFS) had no significant antimicrobial effect on Escherichia coli, while nCFS showed no antimicrobial effect on Shigella dysenteriae. L. fermentum ARD2 exhibited resistance to Ciprofloxacin and was semi-sensitive to Penicillin and Nitrofurazone. The L. fermentum ARD2 showed considerable antioxidant activity, with DPPH and ABTS free radical inhibition rates of 41.40% and 43.60%, respectively. Additionally, it demonstrated the ability to reduce cholesterol absorption by 38.60%. The strain tested negative for DNase and hemolytic activities, and biogenic amine production was not observed. Based on these findings, L. fermentum ARD2 exhibits promising probiotic characteristics and could be utilized as a probiotic bacterium in food products.
Volume 21, Issue 157 (March 2025)
Abstract
Althaea officinalis is one of the plants containing mucilage, the therapeutic effect of its mucilage on the mucous membrane of the tissue and the healing of stomach ulcers has been proven. The mucilage of this plant consists of L-rhamnose, D-galactose, galacononic acid and D-glucuronic acid. The polysaccharides found in this plant have antioxidant properties. The main antioxidant activity of this plant is related to its α-tocopherol composition. Gums extracted from different sources have different functional and rheological properties than each other, and the conditions of extraction have a significant effect on these properties. In this research, the extraction efficiency of Althaea officinalis mucilage as a new hydrocolloid source was studied. For this purpose, the effect of microwave power (250-850W), water-grain ratio (50-90) and time (2-10 minutes) on the extraction efficiency were optimized. The gum extraction efficiency ranged from 4.4% to 11.6%. It can be seen that the lowest amount of extraction was obtained at a ratio of water to grain of 70, time of 2 minutes and power of 550 watts, and the maximum amount of extraction was obtained at a ratio of water to grain of 80, time of 4 minutes and microwave power of 700 watts. According to the results obtained from analysis of variance Data, quadratic model is the best model to describe data. In low powers, increasing the ratio of water to seeds led to an increase in extraction efficiency. The increase in extraction efficiency by increasing the ratio of water to seeds can be attributed to the presence of more solvent, which intensifies the driving force for the transfer of gum mass from the seeds.