جستجوی مقالات مرتبط با کلیدواژه « Tragacanth » در نشریات گروه « پزشکی »

Supplementing bread probiotics is considered to be challenging because of the high baking temperatures. In this study the influence of encapsulation by tragacanth gum on the validity of Lactobacillus Plantarum and Lactobacillus acidophilus during baking and storing gluten-free sorghum bread for three days. Moreover, the effect of probiotics encapsulation on moisture content and hardness as two major factors of bread staling were investigated. The process of baking process reduced the observed validity of L. Plantarum and L. acidophilus by about 3 logs CFU/g in gluten-free sorghum bread significantly. Additionally, we found that Plantarum, L. acidophilus, and encapsulated L. during baking and storing processes strongly depend on matrix composition to survive. Encapsulation of probiotic cells by tragacanth gum can improve the viability of probiotic cells can be improved by encapsulating them by more than 2 log cycles in gluten-free sorghum bread during the storing process. The tragacanth gum showed a good protecting impact on L. Plantarum and L. acidophilus cells during 72 h storage. Overall, what the findings suggest is that encapsulating probiotics by tragacanth gum is a strategy promising to promote the survival of bacteria and delay staling of gluten-free sorghum bread.

To date, platelet (PLT) transfusion is the main medical option for the treatment of thrombocytopenia. Nowadays, allogenic PLTs are commonly used for blood donation. Due to the limitations in the preparation and storage of PLTs, researchers try to develop alternative modalities such as bioreactors for the in-vitro expansion and production of PLTs for therapeutic purposes by promoting the differentiation of different types of stem cells into megakaryocytes (MK) and PLTs.

In this experimental study, umbilical cord blood stem cells (UCB-SC) were differentiated into MK. To this end, a new bioreactor system consisting of six compartments and a two-layer scaffold made of collagen and natural tragacanth gum was developed to mimic a bone marrow-like structure. After MKs were loaded to the top layer of the scaffold, the production rate of PLTs was analyzed under shear stress.

Based on the estimation, each MK produced about 17.42 PLTs loaded into the scaffold collagen. This value emerged to be 23.46 and 9.44 PLTs in the collagen-tragacanth and the pure tragacanth scaffold groups, respectively, the increase of PLTs in the collagen-tragacanth scaffold was statistically significant (p < 0.001).The generated PLTs had a positive response in aggregometry as well as interaction with normal PLTs.

Taken together, the designed bioreactor with a collagen-tragacanth substrate can be used for the production of a sufficient number of PLTs for clinical purposes.

In this study the rheological and textural properties of Iranian white cheese produced by ultrafiltration technique containing gum tragacanth and xanthan gum each in the range of 0-0.1%, and basil seed and linseed mucilages each in the range of 0-0.2% were evaluated. According to the results obtained, values of Elastic (G/) and viscous (G//) moduli increased with increasing frequency sweep in all the cheese samples. G/ was always greater than G//. The values of G/ and G// in the samples containing 0.05% of gum tragacanth, 0.05% of xanthan gum and 0.1% of basil seed mucilage and containing 0.05% of xanthan gum, 0.1% basil seed and 0.1% linseed mucilage were maximum and in samples containing 0.1% of xanthan gum and 0.2% of linseed mucilage and containing 0.1% of gum tragacanth were minimum. By increasing basil seeds mucilage in the samples, hardness, cohesiveness, gumminess and chewiness increased in comparison with the control sample (p<0.01). According to the results obtained, for preparation of white cheese produced by ultrafiltration technique, using 0.05 % of gum tragacanth, 0.05 % of xanthan gum and 0.1 % of linseed mucilage, is recommended.

In this paper, grafting of acrylic acid monomer on Gum tragacanth was performed. Variable of experiment included concentration of initiators and monomer, time, and temperature. Grafting efficiency was measured in the term of percentage of grafting (%G) and percentage of grafting efficiency (%E). Effectiveness of grafted gum in ferrous ion removal at different condition was assessed. According to this study, grafting was influenced by different concentration of initiators. The best result obtained at 5 × 10-3 mol/dm-3 [Fe2], 1.35 × 10-3 mol/dm3 [H], 4 × 10-3 mol/dm3 potassium monopersulfate and monomer concentration = 5 × 10-2 mol/dm3. Amount of added gum was restricted to 0.25 g, addition of more gum resulted to abrupt decrease of both parameters. Time and temperature affected grafting reaction and the best condition for grafting was 25 ºC, 90 min. Finally, the ability of resultant grafted gum for removal of ferrous ion from aqueous media was assessed. The maximum removal of ferrous ion took place at pH = 6, grafted gum = 150 mg and contact time 60 min.

Colloidal materials and suspended solids cause turbidity in water. To remove turbidity, clarification method is used that includes processes of coagulation, flocculation, and sedimentation. Due to the long duration of coagulation process, coagulant aids are applied. Despite the favorable efficiency of synthetic polyelectrolytes as a coagulant aid, due to their harmful effects on human health, in this process natural organic polymers are used instead.
In this research, the use of tragacanth as a natural organic coagulant aid instead of synthetic polymers in water turbidity removal along with alum and poly aluminum chloride is studied. To compare the experiments with natural conditions, Karun River water is analyzed. To complete these studies, the effects of several factors such as tragacanth concentration, the concentration of alum and poly aluminum chloride, and pH changes in average and low turbidity are investigated. Optimum pH for turbidity removal was determined by jar testing.
The results showed that the best pH to remove turbidity is 5.5 to 7, with the efficiency of 97.3%. At PH = 6 and at the concentration of 30 mg/L, poly ammonium chloride has maximum efficiency (90%). Using tragacanthat concentrations of 1 and 4 mg/L along with alum at a concentration of 40 mg/L leads to turbidity removal of 81.75%.
Using 2 and 4 mg/L of tragacanth, a significant removal efficiency is achieved in low and average turbidity.pH=7 leads to the most efficient use of tragacanth coagulant aid.

The quality of cakes made of wheat flour depends on the quantity and quality of its gluten proteins; however, these proteins may have side effects for some people, including the patients with celiac, and the only way to cure this disease is to take a lifelong gluten-free diet. This research aims to produce gluten- free cake by using rice flour and xanthan and tragacanth gums, including two treatments of xanthan gum (0.5 &1 %), two treatments of tragacanth gum (0.5 & 1%), four combination treatments of xanthan gum and tragacanth, and one control treatment (without gum). The effects of tragacanth and xanthan gums on the texture characteristics, moisture content, water activity (aw), color, volume, apparent density, and porosity of the resulting cake were investigated. The data obtained were analyzed by the use of factorial experiments with three replications (3*3) and a Completely Randomized Design (CRD). The results showed that the treatments containing gum have less texture stiffness compared to the control. Among the treatments, those having the combination of 0.5% tragacanth and 1% xanthan gum hold the maximum content of moisture. The L component amount of gluten-free cake samples was increased compared to the control while the rate of a and b components was decreased. The maximum amount of aw is related to the 0.5% treatment tragacanth and 1% xanthan, and the lowest aw belongs to the control. Apparent and bulk density has a difference with the control, and the minimum amount and the maximum amount belong to the treatment containing 1% tragacanth and the control, respectively. Samples containing 1% xanthan and 0.5% tragacanth could be desirable due to less texture stiffness, maximum content of moisture and aw, high color score, minimum density, and better keeping quality during the storage period.

The dispersed phase volume fraction plays key role in oil-in-water emulsion stability by different mechanisms like partial flocculation, depletion flocculation and bridging flocculation. Since the mentioned mechanism is affected by emulsifier concentration presented in system, the major aim of this study was to investigate the effect of dispersed phase volume fraction on physical stability of oil-in-water emulsion in the presence of gum tragacanth. The effect of oil concentration on the stability of oil-in-water emulsion systems containing 0.5% w/w gum tragacanth is investigated by considering rheological properties and droplet size distribution. Emulsion stability was monitored by measuring the extent of gravitational phase separation. Rheological properties and droplet size distribution were measured by rheometer and static laser diffraction immediately after preparation at 25 ºC. All treatments were performed three times and the data were analyzed using SPSS 16.0. Oil concentration enhancement from 10% to 30% w/w decreased emulsion stability. Increasing the oil concentration enhances consistency coefficient from 2.01 to 5.73 pa.sn but decreases flow behavior index. Considering the particle size distribution revealed that number mean diameter increase significantly by oil concentration addition. Emulsion stability index decreased by increasing dispersed phase volume fraction. Considering rheological properties and droplet size distribution, it seems that oil concentration addition however, makes the system more structured but it is unable to create a stable system since the emulsifier is insufficient to protect oil droplets from aggregation.

Emulsions are thermodynamically unstable systems that can be kinetically stable by adding substances known as emulsifiers and/or thickening agents. By respect to the functional properties of gum tragacanth (GT), and its breakage probability during irradiation treatment, the major aim of this study was to investigate the stability of oil in water emulsion in the presence of different doses irradiated GT by respect to its viscosity and viscoelastic properties at constant temperature. The effect of irradiation treatment was studied on the rheological properties of 10% w/w oil in water emulsions systems containing 0.5% w/w GT that is irradiated at doses of 0, 3, 5 and 10 kGy that are called NIGT, GT 3, GT 5, GT 5 and GT 10, respectively. In order to monitor the effect of irradiation treatment on rheological properties, rheometer has been used. All treatments were performed three times and the data were analyzed using SPSS 16.0. Values were considered to be significantly different if p<0.05. Irradiation treatment affects on rheological properties of GT containing oil in water emulsion both in steady state and oscillatory one. Increasing the irradiation dose up to 10 kGy decreases the consistency index from 1.88 to 0.076 and increases the flow behavior index from 0.42 to 0.764. Irradiation treatment also makes the systems behaves more sol like. It should be noted that these differents are dose dependant. Rheological properties of irradiated GT containing emulsion are dose dependant. These changes may be due to the gums structural rearrangement due to irradiation. It is necessary to apply appropriate dose by considering its desirable function.

Gum tragacanth is a natural complex mixture of polysaccharides and alkaline minerals extracted from species of Astragalus plant, which is found widely in arid regions of the Middle East. In a pilot experimental study we examined the effects of its topical application on wound healing in ten albino adult male rats. Two similar parasagittal elliptical full-thickness wounds (control vs. test samples) were created on the dorsum of each animal. Test group samples were fully covered by a thin layer of gum tragacanth daily. The extent of wound healing was evaluated by planimetric analysis on multiple occasions during the 10-day study period. On the 7th day of the study, the percent of wound closure was significantly higher in gum tragacanth-treated specimens compared to the control samples (87%±2% vs. 70%±4%, P<0.001). The majority of wounds in the test group were completely closed by the 10th day of the study. The difference in wound healing index measured by histological examination on day 10 of the study was also statistically meaningful between the two groups (0.624±0.097 vs. 0.255±0.063, P<0.05). The results of this study clearly showed the useful effects of topical application of gum tragacanth in acceleration of skin wound contraction and healing. More studies are encouraged to identify the implicating agents and precisely understand the mechanism by which they exert their wound healing effects.