Masood Homayoni Tabrizi; Ahmad Asoodeh; Hoda Shabestarian
Volume 22, Issue 1 , March and April 2015, , Pages 45-56
Abstract
Background & objective: Due to the side effects of synthetic antioxidants, bioactive agents derived from natural sources are of great importance. The purpose of this study was to identify and characterize an antioxidant peptide derived from enzymatic hydrolysis of β-casein in camel milk, using ...
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Background & objective: Due to the side effects of synthetic antioxidants, bioactive agents derived from natural sources are of great importance. The purpose of this study was to identify and characterize an antioxidant peptide derived from enzymatic hydrolysis of β-casein in camel milk, using pepsin and pancreatin. Materials and Methods: Enzymatic hydrolysis of camel milk had accomplished using pepsin and pancreatin. The hydrolysate was fractioned using RP-HPLC and the peptide of interest was identified with MALD-TOF/TOF technique. Antioxidant activity of isolated peptide was measured by the use of radical scavenging DPPH, ABTS, hydroxyl and superoxide and inhibition of linoleic acid oxidation. Results: The results of sequencing showed that a purified peptide, called RQ-8, has the sequence of RGLHPVPQ with molecular weight of 903.41 Da. This peptide inhibited oxidation of linoleic acid and also had scavenging activity against 1,1-diphenyl-2-picrylhydrazyl (DPPH) (IC50=0.046 mg/ml), 2,2'-azinobis (3-ethylbenzothiazo-line-6-sulfonic acid) diammonium salt (ABTS) (IC50 = 0.085 mg/ml), superoxide (O2·-) (IC50 = 0.156 mg/ml) and hydroxyl (OH ·-) (IC50 = 0.021 mg/ml) radicals. In addition, cellular activity assays showed that the RQ-8 peptide had no toxicity on A549 lung cancer cell line. Conclusion: Results indicated that the peptide RQ-8 isolated from camel milk β-casein protein has a strong antioxidant activity.
Ali Heidarianpour; Ebrahim Zarrin kalam
Volume 20, Issue 1 , March and April 2013, , Pages 34-41
Abstract
Background: Many evidence showed that exercise training has beneficial effects on skin blood flow in the health and diabetic condition. On the other hand some finding showed that C-peptide has protective and therapeutic effect on vascular dysfunction-induced by diabetes. Therefore the purpose of this ...
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Background: Many evidence showed that exercise training has beneficial effects on skin blood flow in the health and diabetic condition. On the other hand some finding showed that C-peptide has protective and therapeutic effect on vascular dysfunction-induced by diabetes. Therefore the purpose of this study is effects of resistance exercise on vascular function of C-peptide. Materials and methods: In this experimental study, Male wistar rats (220±10g, N=30) were used in two diabetic (control and trained) and one age-matched healthy control groups. After 1 week of diabetes induction, animals were submitted to resistance exercise training for 9
Weeks on ladder. To characterize cutaneous micro vascular responses by Laser Doppler
flowmetery, animals were deeply anesthetized by intraperitoneal injection of pentobarbital
sodium (50 mg/kg). For data analysis, one-way ANOVA test was used to compare the groups. Statistically significant difference between the minimum acceptable levels is p<0.05
Results: Local microinjection of c-peptide increased coetaneous blood flow in trained and control diabetic rats, however this effect in trained group is higher than control diabetic group rats. Administration of Nw-nitro-L-arginine (nitric oxide synthase inhibitor) before C-peptide reduced significantly C-peptide vascular effects in trained and control diabetic rats. Conclusions: Chronic resistance exercise potentiate C-peptide vascular function, possibly by nitric oxide pathway