جستجوی مقالات مرتبط با کلیدواژه « immune system » در نشریات گروه « صنایع غذایی »

The immune system is closely related to human health. Accordingly, functional foods containing bioactive compounds can be considered as of the immune system bossters. The aim of the present study was to produce a functional beverage containing extracts of family Brassicaceae plants (white cabbage, red cabbage, broccoli and cauliflower) to improve the immune system in female laboratory mice. For this purpose, hydroethanolic extracts were prepared from four types of cabbage, then the amount of total phenolic and flavonoid compounds and antioxidant capacity by DPPH method for extracts were evaluated. The functional beverage were prepared by combining four extracts with concentrations of 400 and 800 mg/ml and laboratory mice were fed daily with doses of 1 cc for 15 consecutive days. Immune system was assessed by examining IgG, IFN-γ, IL-4, IL-10 and IL-17 by Noncompetitive ELISA method. The results showed high levels of phenol (1.63±0.024 mg GA/g) and total flavonoids (0.426±0.004 mg QE/g) in white cabbage hydroethanolic extract. Also in DPPH method, the highest rate of free radical scavenging was related to red cabbage with 98.26% at a concentration of 800 mg/ml. The results of immune system evaluation showed that three factors of IgG, IL-10 and IL-17 in mice were increased by increasing the concentration of the extract to 800 mg/ml in the functional beverage; IgG factor increased to 10.81±6.68 mg/ml in the control group and to 27.35±20.86 mg/ml in the third group with 800 mg/ml extract concentration. The results showed that the extracts of plants of the Brassicaceae family have a high potential for use in food products with the aim of increasing the quality and nutritional value.

This study was done to evaluate the effect of using different levels of Portulaca Oleracea seed on growth performance, immune system and some blood parameters of broiler chickens. A total of 160 one day old broiler chicks (Ross 308 commercial strain) was used in a completely randomized design with 4 treatments, 4 replicates and 10 chicks in each replicate. Experimental diets include Portulaca Oleracea seed at the levels of 0, 2, 5/2, 5 and 5/7 percent. To evaluate the humoral immune system, 1 ml of SRBC (%10) was injected to 2 chicks in each replicate and blood samples collected from wing vein on 35, 42 d. Birds vaccinated against bronchitis, Newcastle and Gambaro diseases. The blood samples of 42 d were used for measuring blood parameters. Body organs were studied as percentage of body weight on 42 d. The results showed that Portulaca Oleracea seed increased body weight and feed intake of broiler chickens at growth, finisher and whole period of rearing (P<0.05). There was no difference among birds IgY titer. Feed conversion ratio improved with Portulaca Oleracea seed at the level of 2/5 percent in all experimental periods (P<0.05). The weight of bursa of fabricius and other body organs was not different in all groups at 42 d. Using different levels of Portulaca Oleracea seed in experimental diets had not significant effect on antibody titer against SRBC, blood hematocrit, triglyceride, ALP, AST, ALT enzymes and blood calcium, but it increased blood cholesterol concentration (P<0.05).

In the present study, simultaneous evaluation for the survival ability of probiotic bacteria at pH 2.5, viability in the presence of pepsin-pancreatin, resistance to bile salt, Adhesion ability, bacterial resistance against antibiotic substances with measuring of minimum inhibitory concentration, auto-aggregation and co-aggregation with interference of (Escherichia coli (NCTC 12900 O157:H7), Salmonella enterica (ATCC 13076) and Listeria monocytogenes (ATTC 7644)) were investigated. In the test of Acid tolerance, it was found that all the strains except LF 55, 61 and F had high viability. Strains LF 56, LF 57, LF 55, O, F and strains LF 56, LF 57 and A7 showed that had the most resistant against pancreatin and in the presence of pepsin, respectively. Furthermore, all of the strains except La5, 52 and 49 were highly resistant to bile salts. Among the 19 strains, Lactobacillus gasseri had the highest adhesion ability (62.90%). Strain Lactobacillus plantarum LF 56 and Lactobacillus gasseri 54 C showed that had the highest potentials for auto-aggregation and co-aggregation (75.31% and 33%) on three pathogens, respectively. Several strains of Lactobacillus plantarum were sensitive to the studied antibiotic substance. However, strains M8 and M11 were resistant to Kanamycin and Chloramphenicol, and also, LF 55 and D showed high resistance against Ampicillin and Chloramphenicol, respectively. It was, moreover, found that Kanamycin, Tetracycline and Chloramphenicol had no significant influence on strains 61. It was demonstrated that Lactobacillus gasseri had medium resistance to Ampicillin, Erythromycin and Tetracycline, while Lactobacillus fermentum showed highly resistance to Ampicillin and Erythromycin. According to the results, human-isolated Lactobacillus gasseri gained the high scores in terms of probiotic properties as compared with other strains. Therefore, Lactobacillus gasseri can potentially protect epithelium tissue of intestine against pathogenic bacteria and it is a preferred candidate for prophylactic purposes, preventing of intestine infections and increasing of body immune system.