Decrease In Antioxidant Activity Research Articles

Markers of lipid peroxidation and antioxidant status in the serum and saliva of patients with active Crohn disease.

Introduction Increased oxidative stress has been implicated in the pathogenesis of Crohn disease (CD). Except for C‑reactive protein (CRP), good biological markers of CD activity are lacking. Objectives We aimed to investigate the diagnostic usefulness of selected markers of oxidative stress in the serum and saliva of patients with active and inactive CD. Patients and methods A total of 58 patients with confirmed CD (32 with active CD, 26 with inactive CD, and 26 healthy controls) were prospectively enrolled to the study. The markers examined were malondialdehyde (MDA), ferric reducing ability of plasma (FRAP), reduced glutathione (GSH), and catalase (CAT). Results MDA levels were higher in the serum and saliva of patients with active CD than in those with inactive CD and controls and were positively correlated with the Crohn's Disease Activity Index (r = 0.8, P <0.001) and CRP (P <0.001). Serum and saliva antioxidant indicators (FRAP and GSH) were decreased in both CD groups compared with controls and were negatively correlated with clinical activity and inflammation (FRAP, r = -0.5, P <0.001; GSH, r = -0.5, P <0.001; and CAT, r = -0.5, P <0.001). Conclusions The increased lipid peroxidation and decreased antioxidant activity in serum and saliva confirm that CD patients are under oxidative stress. The positive correlations of MDA with the clinical activity and inflammation, as well as the comparison of the receiver operating characteristic curves for MDA and CRP, suggest that MDA could be a good diagnostic marker of CD.

Role of PON1, SOD2, OGG1, XRCC1, and XRCC4 polymorphisms on modulation of DNA damage in workers occupationally exposed to pesticides

Tobacco farming has been proving to induce poor health outcomes in agricultural workers, genomic instability being the triggering one. This study evaluated influence of PON1 (paraoxonase 1), SOD2 (superoxide dismutase), OGG1 (8-oxoguanine glycosylase), XRCC1 (X-ray repair cross-complementing protein 1), and XRCC4 (X-ray repair cross-complementing protein 4) genes polymorphisms on DNA damage in 121 subjects occupationally exposed to pesticides mixtures and nicotine at tobacco fields and 121 non-exposed individuals. Inorganic elements (Cl, P, S and Zn) and cotinine levels were found increased in farmers, confirming exposure. Results show higher frequencies of buccal micronucleus (MN), nuclear buds (NBUD), binucleated cells (BN) and damage index (comet assay), reduced telomere length (TL), and increased parameters of oxidative stress in farmers compared to non-exposed individuals. PON1 Gln/Gln genotype was associated with increased MN frequency. SOD2 Val/Val showed association with increased frequency of MN and NBUD and decreased antioxidant activity. The XRCC1 Arg/Arg showed protective effect for MN, BN and TL, which was also positively influenced by OGG1 -/Cys. MN was decreased in XRCC4 -/Ile farmers. These genotypes also showed a risk for antioxidant activity. Our study proposes that PON1 and SOD2 variants play a role in xenobiotic-metabolizing system in farmers, while base excision repair (BER) pathway could be the repair mechanism involved in genomic instability suffered by tobacco farmers.

The effect of carbon irradiation is associated with greater oxidative stress in mouse intestine and colon relative to γ-rays

Carbon irradiation due to its higher biological effectiveness relative to photon radiation is a concern for toxicity to proliferative normal gastrointestinal (GI) tissue after radiotherapy and long-duration space missions such as mission to Mars. Although radiation-induced oxidative stress is linked to chronic diseases such as cancer, effects of carbon irradiation on normal GI tissue have not been fully understood. This study assessed and compared chronic oxidative stress in mouse intestine and colon after different doses of carbon and γ radiation, which are qualitatively different. Mice (C57BL/6J) were exposed to 0.5 or 1.3 Gy of γ or carbon irradiation, and intestinal and colonic tissues were collected 2 months after irradiation. While part of the tissues was used for isolating epithelial cells, tissue samples were also fixed and paraffin embedded for 4 µm thick sections as well as frozen for biochemical assays. In isolated epithelial cells, reactive oxygen species and mitochondrial status were studied using fluorescent probes and flow cytometry. We assessed antioxidant enzymes and nicotinamide adenine dinucleotide phosphate (NADPH) oxidase activity in tissues and formalin-fixed tissue sections were stained for 4-hydroxynonenal, a lipid peroxidation marker. Data show that mitochondrial deregulation, increased NADPH oxidase activity, and decreased antioxidant activity were major contributors to carbon radiation-induced oxidative stress in mouse intestinal and colonic cells. When considered along with higher lipid peroxidation after carbon irradiation relative to γ-rays, our data have implications for functional changes in intestine and carcinogenesis in colon after carbon radiotherapy as well as space travel.

Grape Seed Extract Alleviates Dexamethasone-Induced Hyperlipidemia, Lipid Peroxidation, and Hematological Alteration in Rats.

The ameliorative effects of dietary natural compounds have drawn increasing attention. Dietary antioxidant is considered a common practice adopted in traditional and alternative medicine. The current study was considered to assess the ameliorative effect of grape seed extract on dexamethasone-induced hepatotoxicity in rats. Rats were injected with dexamethasone, (0.1mg/kg; i.m.), three times per week, for 30days. The other groups; dexamethasone (0.1mg/kg) and grape seed extract at a dose of 200 and 400mg/kg were given orally to rats, respectively. Dexamethasone treatment resulted in a significant elevation in liver function markers activities, lipid profile, and hematological alterations; also, a remarkable increase in hepatic lipid peroxidation marker whereas decreased antioxidant activities in rats. However, administration of grape seed extract resulted in a reversal of dexamethasone-induced lipid peroxidation, antioxidant enzyme activities, liver function markers and lipid profile, and hematological alterations. Moreover, grape seed extract demonstrated preventive action against dexamethasone-induced histopathological changes in rat liver tissues. In conclusion, grape seed extract exhibited a protective effect in rats against oxidative stress, hyperlipidemia and hematological alterations induced by dexamethasone.

Selenium in Complicated Pregnancy. A Review.

Selenium (Se) is an essential trace element of significant importance in human health. Diet is the major source of Se, and intake of this element depends on its concentration in food sources as well as the amount of those sources consumed. Unfortunately, daily dietary intake of Se in most European countries is generally low, ∼30-40μg/day, compared with the recommended dietary allowance, ∼55 and 70μg/day for adult females and males, respectively. The importance of Se as an essential trace element is linked to its role as selenocysteine in a number of selenoproteins including antioxidant enzymes glutathione peroxidases (GSH-Pxs), thioredoxin reductases (TrxRs), and selenoprotein P (SePP). These enzymes protect tissues against the damaging effect of reactive oxygen species (ROS) and other endogenous products of cellular metabolism implicated in DNA damage and potentially leading to mutagenesis, cell death, and carcinogenesis. Reduced body Se and antioxidant enzyme activity during pregnancy results in oxidative stress within tissues contributing to premature birth, miscarriage, preeclampsia, and intrauterine growth retardation. Because placenta development is highly dependent on oxygen status, uncontrolled ROS formation is likely detrimental. Despite these findings, the role of Se and Se-dependent enzymes in pregnancy remains controversial. The objective of this review is to explore Se status in pregnancy with respect to adverse outcomes. Effects related to decreased antioxidant activity and increased oxidative stress will be highlighted.

INFLUENCE OF BENZIMIDAZOLE DERIVATIVES ON FORMATION OF OXIDATIVE STRESS UNDER PHYSICAL LOAD

Aim. To study the influence of benzimidazole derivatives on the formation of oxidative stress under the impact of physical load. Materials and methods. Physical load (PL) was induced on intact outbred male rats by daily swimming for 21 days. Physical load, induced by swimming, is a convenient model of muscular work and it can be dosed. It, as a forced for rats procedure, caused stress, the development of which was controlled by changes in adrenal mass indices and blood leucocyte number in the animals. Results. The impaired behavioral reactions, decreased antioxidant activity in the liver and brain homogenates, elevated peroxidation product content, raised hemiluminescence intensity was detected. Conclusions. Negative manifestations of the developed psychoemotional and oxidative stress were restrained by the introduction of dibazol and synthesized potassium salt 2-[1-(1,1-dioxothietanyl-3)benzimidazolyl-2-thio] acetic acid.

Experimental diabetes impairs maternal reproductive performance in pregnant Wistar rats and their offspring

ABSTRACTThe aim of this study was to determine the effect of mild hyperglycemia on metabolism during pregnancy, the maternal reproductive performance, and the characteristics of the offspring in neonatal mild diabetic-induced Wistar rats. The experimental diabetes model was generated by neonatal streptozotocin administration (100 mg of streptozotocin/Kg bw/sc) in female Wistar rats. At adulthood, the control and diabetic group were mated. At the 20th day of gestation, a maternal and fetal blood sample were collected for biochemical measurement. The maternal livers, fetal livers, and placenta were removed for oxidative stress measurements. Maternal reproductive outcomes and fetal and placental morphometric measurements were analyzed. The fetuses were classified as small, appropriate, and large for pregnancy age, and examined for the presence of external anomalies. The diabetic group showed mild hyperglycemia, altered glucose tolerance, increased total cholesterol, triglycerides, and hemoglobin A1c during pregnancy. At the 20th day of gestation the diabetic mothers presented increased reabsorptions and embryonic losses before and after implantation, reduced corpora lutea number, litter size, implantation sites, live fetuses, and decreased efficiency of implantation rate. Similarly, the offspring showed reduced fetal, craniofacial, and placental dimensions, in addition to a higher proportion of small fetuses for pregnancy age. Mild hyperglycemia during pregnancy did not generate marked oxidative stress in the mother, and in fetal liver and placenta decreased antioxidant activity was evident by significant consumption of reduced glutathione. Mild diabetes led to a negative impact on maternal reproductive performance and characteristics of the offspring. This experimental model reproduced maternal and fetal outcomes of pregnant rats presenting controlled diabetes.Abbreviations: bw: body weight; sc: subcutaneous; DM: diabetes mellitus; STZ: streptozotocin; OGTT: oral glucose tolerance test; ITT: insulin tolerance test; GSH: glutathione; MDA: malondialdehyde; AOPPs: advanced oxidation protein products; TBARs: thiobarbituric acid reaction; SPA: small for pregancy age; APA: appropriate for pregnancy age; LPG: large for pregnancy age; ROS: reactive oxygen species

ANTIOXIDANT STATUS OF THE FOLLICULAR LIQUID AND ITS RELATION WITH THE QUALITY OF EMBRYON IN INFERTILITY PATIENTS PASSING THROUGH THE PROCEDURE OF EXTRACORPORAL FERTILIZATION

The aim of the study is to evaluate the antioxidant properties of the follicular fluid with a new chemiluminescent method in women with a reduced ovarian reserve and tubal factor of the infertility, undergoing in vitro fertilization (IVF) procedure, and to compare the obtained data with embryo quality. Material and methods. Samples of the follicular fluid were obtained during oocyte sampling in 16 women with a reduced ovarian reserve and 16 women with a tubal peritoneal factor of the infertility. Patients in both groups were matched for the age, body mass index and hormonal stimulation protocol (short protocol). The antioxidant activity of the follicular fluid was measured by the method of luminol-activated chemiluminescence using 2,2’-azobis (2-amidinopropane) dihydrochloride as a source of radicals. The total antioxidant activity (AOA) and antioxidant activity due to the action of proteins (AOA-b) were determined. Results. The kinetic curve of chemiluminescence of the follicular fluid is similar in shape to the curve of the antioxidant activity of the blood plasma. As in blood plasma, antioxidant activity is caused by uric acid and proteins - albumins and globulins. As a result of the study, three groups of patients were identified, whose AOA significantly differed: patients with low embryo quality and decreased antioxidant activity, AOA 11.4 ± 2.5 mM ascorbate (n = 16); patients with a good quality embryo, AOA 21.4 ± 3.8 mM (n = 10); patients with a low embryo quality and an elevated AOA of 33.7 ± 2.9 mM (n = 6). Conclusions. Based on the comparison of AOA (in ascorbate units) with the quality of the embryo, three areas can be proposed: 1) a zone of reduced antioxidant activity (less than 15 μM, oxidative stress) - these patients had embryos of poor quality; 2) the zone of normal AOA (15-30 μM) - the patients received good quality embryos; 3) zone of increased AOA (more than 30 μM, antioxidant stress) - embryos of poor quality. Thus, it can be assumed that optimal development of embryos in the follicle requires the optimal value of antioxidant activity, since both its reduction (oxidative stress) and increase (antioxidant stress) adversely affect the quality of the embryo and the outcome of IVF. These data correspond to the modern concept that optimal development of the oocyte requires an optimal level of production of reactive oxygen species.

Abstract P216: Nicotinamide Nucleotide Transhydrogenase Regulates Mitochondrial Redox Balance and Endothelial Function in Response to Angiotensin II

Hypertension (HTN) involves increased peripheral resistance to blood flow mediated by changes in vascular tone. Endothelial dysfunction is an initiating step in HTN and mitochondrial reactive oxygen species (ROS) contribute to endothelial dysfunction. Nicotinamide nucleotide transhydrogenase (NNT) is a critical enzyme in the regulation of mitochondrial NADPH levels and can impact mitochondrial redox status. We have demonstrated that the loss of NNT in C57Bl/6J mice is associated with a more severe hypertensive phenotype in response to Ang II characterized by mitochondrial and vascular dysfunction driven by vascular ROS production in vivo and in vitro . Little is known regarding the role of NNT human endothelial cells, but based on previous studies we hypothesize that the loss of NNT promotes mitochondrial and cellular ROS production and disrupts normal endothelial • NO function. In human aortic endothelial cells (HAEC) treatment with 500nM Ang II for two hours significantly increased NNT expression (225 + 1 3%) and glutathione peroxidase 2 (Gpx2) activity (17.81 + 0 .75 vs 29.06 + 2 .53 nmol/min/ug protein) consistent with NNT’s role in driving the mitochondrial antioxidant systems. Conversely, siRNA knockdown of NNT inhibited Gpx2 activity (18.32 + 1.17 vs 13.16 + 0 .7 nmol/min/ug protein) and increased mitochondrial superoxide production (0.12 + 0 .01 vs 0.17 + 0 .01 nmol/mg protein) in response to Ang II. These changes in the redox balance of the mitochondria contribute to mitochondrial dysfunction where the loss of NNT led to a marked decrease in the respiratory control ratio (RCR) of the mitochondria (6.42 + 0 .17 vs 3.83 + 0 .1) of Ang II treated cells. Ultimately, this shift to a pro-oxidative mitochondrial redox phenotype in these cells conspired to inhibit Ang II-induced • NO production (35.60 + 1 .28 vs 30.10 + 1 .24 pmol/mg protein). Our data indicate that the absence of NNT expression increases the steady state levels of mitochondrial ROS through increased ROS production and decreased antioxidant activity, which is contributes to reduced • NO production and endothelial dysfunction. These studies highlight NNT as a novel regulator of mitochondrial redox tone that may critically impact the ability of vascular ROS to contribute to the development of HTN.

Hepatoprotective effect of 10% ethanolic extract from Curdrania tricuspidata leaves against ethanol-induced oxidative stress through suppression of CYP2E1

The hepatoprotective effect of 10% ethanolic extract of Curdrania tricuspidata (CTE) was investigated in HepG2/2E1 cells and C57BL/6 J mice. When compared ethanol-only treated HepG2/2E1 cells, pretreatment of CTE prevented increased intra-cellular reactive oxygen species levels and decreased antioxidant activities by ethanol-induced oxidative stress. In C57BL/6 J mice, CTE at a dose of 250 mg/kg/day was administered for 10 days, with ethanol (5 g/kg/day) administered for the final 3 days. Pretreatment with CTE prevented the elevated activities of serum aspartate aminotransferase, alanine aminotransferase, and alkaline phosphatase caused by ethanol-induced hepatic damage. CTE-treated mice displayed a reduced level of malondialdehyde and increased antioxidant activities of catalase, glutathione S-transferase, glutathione peroxidase, and superoxide dismutase, as well as a reduced level of glutathione as compared with ethanol-only-treated mice. CTE-treated mice exhibited significant inhibition of CYP2E1 activities and expression. These results suggest that CTE could be a useful agent for the prevention of ethanol-induced oxidative damage in the liver, elevating antioxidative potentials and alleviating oxidative stress by suppressing CYP2El.

Estradiol Protects Against Cardiorespiratory Dysfunctions and Oxidative Stress in Intermittent Hypoxia.

We tested the hypothesis that estradiol (E2) protects against cardiorespiratory disorders and oxidative stress induced by chronic intermittent hypoxia (CIH) in adult female rats. Sprague-Dawley female rats (230-250 g) were ovariectomized and implanted with osmotic pumps delivering vehicle or E2 (0.5 mg/kg/d). After 14 days of recovery, the rats were exposed to CIH (21%-10% O2: 8 h/d, 10 cycles per hour) or room air (RA). After 7 days of CIH or RA exposure, we measured arterial pressures (tail cuff), metabolic rate (indirect calorimetry), minute ventilation, the frequency of sighs and apneas at rest, and ventilatory responses to hypoxia and hypercapnia (whole body plethysmography). We collected the cerebral cortex, brainstem, and adrenal glands to measure the activity of NADPH and xanthine oxidase (pro-oxidant enzymes), glutathione peroxidase, and the mitochondrial and cytosolic superoxide dismutase (antioxidant enzymes) and measured lipid peroxidation and advanced oxidation protein products (markers of oxidative stress). CIH increased arterial pressure, the frequency of apnea at rest, and the hypoxic and hypercapnic ventilatory responses and reduced metabolic rate. CIH also increased oxidant enzyme activities and decreased antioxidant activity in the cortex. E2 treatment reduced body weight and prevented the effects of CIH. E2 prevents cardiorespiratory disorders and oxidative stress induced by CIH. These observations may help to better understand the underlying mechanisms linking menopause and occurrence of sleep apnea in women and highlight a potential advantage of hormone therapy.

Prenatal Nonylphenol and Bisphenol A Exposures and Inflammation Are Determinants of Oxidative/Nitrative Stress: A Taiwanese Cohort Study.

Prenatal exposure to nonylphenol (NP) and/or bisphenol A (BPA) has been reported to be associated with adverse birth outcomes; however, the underlying mechanisms remain unclear. The primary mechanism is endocrine disruption of the binding affinity for the estrogen receptor, but oxidative stress and inflammation might also play a contributory role. We aimed to investigate urinary NP and BPA levels in relation to biomarkers of oxidative/nitrative stress and inflammation and to explore whether changes in oxidative/nitrative stress are a function of prenatal exposure to NP/BPA and inflammation in 241 mother-fetus pairs. Third-trimester urinary biomarkers of oxidative/nitrative stress were simultaneously measured, including products of oxidatively and nitratively damaged DNA (8-hydroxy-2'-deoxyguanosine (8-OHdG) and 8-nitroguanine (8-NO2Gua)) as well as products of lipid peroxidation (8-iso-prostaglandin F2α (8-isoPF2α) and 4-hydroxy-2-nonenal-mercapturic acid (HNE-MA)). The antioxidant glutathione peroxidase (GPx) and inflammation biomarkers, including C-reactive protein (CRP) and a panel of cytokines (interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α)), were analyzed in maternal and umbilical cord plasma samples. In adjusted models, we observed significant positive associations between NP exposure and 8-OHdG and 8-NO2Gua levels, between BPA and 8-isoPF2α levels, and between maternal CRP levels and HNE-MA levels. Additionally, BPA and TNF-α levels in cord blood were inversely associated with maternal and GPx levels in cord blood as well as maternal TNF-α levels were inversely associated with maternal GPx levels. These results support a role for exposure to NP and BPA and possibly inflammation in increasing oxidative/nitrative stress and decreasing antioxidant activity during pregnancy.

Опыт применения набуметона у онкогинекологических больных

Objective: to study the effect of nabumetone in oncogynecologic patients in the postoperative period. Materials and methods. There were examined 98 patients of 40-78 years old, who were divided into two groups: the main group - 58 patients, of which 37 - patients with endometrial cancer I-III and 21 - with ovarian cancer of II-IV stage (FIGO); The comparison group included 40 patients (17 and 23 patients respectively). All patients underwent surgical treatment. In the postoperative period, were used NSAIDs - nabumeton. Before the operation and on the 10th day of the postoperative period, the following parameters were studied: a clinical blood test, TNF-a, ceruloplasmin, diene conjugates (DC), malonic dialdehyde (MDA), antioxidant activity (AOA). The content of TNF-a, in the blood serum was determined by radioimmunological, and DC, MDA, AOA by biochemical method. Results. Established: the content of the leukocyte formula before the start of treatment in the compared groups did not reveal any significant differences. After surgical intervention, both groups showed an increase in the absolute values of all leukocyte fractions. The level of ceruloplasmin in the patients of the comparison group increased significantly in the postoperative period, and in the main group the parameters of ceruloplasmin did not differ significantly. The level of TNF-a in the pre- and postoperative period in the compared groups did not differ. On the 10th day of the postoperative period, it significantly increased in the comparison group, and when nabumetone was used during the postoperative period, the level of TNF-a did not increase. The initial indicators characterizing the processes of LPO and AOA in both groups did not differ significantly. Assessing the dynamics of indicators before and after the operation, it was noted that in patients in the blood, the level of DC in both the baseline and in the comparison group increased. The use of nabumethon led to a slight increase in DC. The maintenance MDA in the postoperative period has increased in both groups, however it is unreliable in comparison with parameters before surgical intervention. In the comparison group, after the treatment, the antioxidant defense was reliably reduced. In the main group, the use of nabumetone contributed to a smaller decrease in AOA. The use of nabumeton allowed abandoning of narcotic analgesics in earlier periods of the postoperative period. Conclusion. Use of nabumeton in the postoperative period allows to reduce the pain syndrome, the number of inflammatory complications; contributes to the normalization of LPO processes, inhibits the inhibition of the antioxidant system, which contributes to the reduction of endogenous intoxication and improves the results of treatment of oncogynecologic patients. Key words: nabumeton, oncogynecologic patients, anti-inflammatory action, tumor necrosis factor, ceruloplasmin, diene conjugates, malanialdehyde, antioxidant activity.

Inhibition of TrxR2 suppressed NSCLC cell proliferation, metabolism and induced cell apoptosis through decreasing antioxidant activity

AimsThis study aims to analyze the effect of thioredoxin reductase 2 (TrxR2) on lung cancer cell proliferation, apoptosis, invasion and migration in vitro. Main methodsReal-time PCR was used to measure the expression of TrxR2 in NSCLC tumor tissues. After pAd-TrxR2 or shRNA-TrxR2 was transfected into A549 or NCI-H1299 cells, the cell proliferation was measured by CCK-8 method; cell apoptosis was measured by flow cytometry; cell invasion and migration was measured by Transwell method. The production of ROS was measured by DCFH-DA method; the activity of SOD, CAT and GSH-Px was measured by relative ELISA kit. Key findingsThe results showed that TrxR2 was up-regulated in NSCLC tumor tissues. Inhibition of TrxR2 suppressed NSCLC cell proliferation and induced apoptosis, and inhibited cell invasion and migration. However, overexpression of TrxR2 showed the opposite effect. Furthermore, when cells were transfected with shRNA-TrxR2, the production of ROS was significantly increased, and SOD, CAT and GSH-Px activity was decreased. Conversely, pAd-TrxR2 transfection showed the opposite effect. SignificanceTaken together, our results suggest that TrxR2 acts as an oncogenic gene in the context of lung cancer progression. The inhibition of TrxR2 suppressed lung cancer cell proliferation, invasion and migration and induced cell apoptosis by inducing ROS production and decreasing antioxidant activity. TrxR2 may be a potential target for NSCLC treatment.

Increased Oxidative Stress in Living Kidney Donors: Correlation of Renal Functions With Antioxidant Capacity

BackgroundSubstantial attention has recently been paid to the possibility of an increased risk of chronic kidney disease (CKD) in living kidney donors. It has been demonstrated that CKD patients suffer from increased oxidative stress, which have been reported to show a strong association with several clinical problems such as accelerated atherosclerosis. The purpose of the current cross-sectional, single-center study was to evaluate the relationship between renal functions of living kidney donors and systemic oxidative stress. MethodsA total of 55 living kidney donors operated at least 1 year ago and 40 age- and sex-matched healthy individuals were enrolled in this study. Plasma malondialdehyde (MDA) levels were determined as oxidative stress marker. Superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities were measured as antioxidants. Renal function parameters and proteinuria were also assessed. ResultsMean serum creatinine levels were higher (P = .022) and 24-hour creatinine clearance was lower (P = .016) in living kidney donors compared with healthy controls. Serum MDA levels were higher (P = .034), and SOD and GPx activities were lower (P = .023 and P < .001, respectively). There was a significant positive correlation between serum GPx activity and 24-hour creatinine clearance levels (r = 0.524, P < .01). A linear regression analysis showed that serum GPx activity was still significantly and positively correlated with creatinine clearance (regression coefficient = 0.416, P < .001). ConclusionOur data demonstrated that living kidney donors exhibit slightly reduced kidney function, increased oxidative stress, and decreased antioxidant activity. We propose that 24-hour creatinine clearance is positively correlated with antioxidant enzyme GPx. To our knowledge, this is the first study to demonstrate the association between renal functions and antioxidant activity in kidney donors.

Composite flour blends: Influence of particle size of water chestnut flour on nutraceutical potential and quality of Indian flat breads

Different sieve particle sizes P1 (Whole), P2 (≤0.212 mm) and P3 (≤0.125 mm) of water chestnut flour (WCF) were studied for proximate composition, mineral content, physico-chemical, functional, pasting and antioxidant properties in comparison to refined wheat flour (WF). WCF had significantly higher levels of fiber, resistant starch, mineral (K, Mg, Zn, and Cu), phenolics and flavonoids than WF in the order (P1 > P2 > P3 > WF). Increase in flour fineness decreased antioxidant activity (P1 > P2 > P3) with P1 having highest phenolic (4.72 mg GAE/g), flavonoid (2.46 mg QE/g) content. Pasting properties of P1 were significantly lower than WF but significantly increased with increase in flour fineness. Quality of flat bread produced from WCF-WF blends significantly varied with particle size and blending. Bake loss and baking time significantly decreased while shrinkage increased with decrease in particle size. L* value decreased with blending but showed an irregular trend with variation in particle size. (WF > P2 ≥ P3 > P1). Baking decreased DPPH scavenging activity more in WF bread (46.68%) than WCF bread (P1 = 17.71%, P2 = 16.45%, P3 = 19.63%). Baking decreased total phenolic and flavonoid content by 49 and 20% in wheat & 38 and 16% in WCF respectively while significantly increased the resistant starch content in the order (P3 > P2 > P1 > WF). This shows better retention of antioxidant activities and greater stability of WCF phenolics than WF phenolics during baking. Sensory analysis showed WCF breads had fair acceptability due to their characteristic flavor. Thus, gluten free WCF bread is also antioxidant rich with ample resistant starch content than WF breads.

Formulasi Mikroemulsi Ekstrak Terpurifikasi Daun Bayam Merah (Amaranthus tricolor L.) Sebagai Suplemen Antioksidan

A research has conducted about the microemulsion formulation of purified extract of red spinach leaves (Amaranthus tricolor L.) as an antioxidant supplement with the aim to be able to know the formula to form a microemulsion which meet the physical quality stability and determine antioxidant activity (IC50) of the preparation. Extracts prepared by maceration method using ethanol 96% and then later do the purification using solvent n-hexane and ethyl acetate, after it tested its antioxidant activity. Formula to form a microemulsion purified extract of red spinach leaves clear is to use virgin coconut oil (VCO) by 15%, tween 80 for 40%, 35% glycerin and 10% distilled water. Physical stability test was conducted on the organoleptic test, measuring the diameter of globules, pH test, test and test viscosity centrifugation. Test of antioxidant activity in vitro using DPPH method and using Vitamin C as a positive control. Measurement data were statistically analyzed using paired samples T test. The test results of antioxidant activity microemulsion purified extracts of spinach leaves, red show IC50 values on day 1 was 1.83 ppm and the 28th day amounted to 3.71 ppm. While vitamin C microemulsion shows IC50 values on day 1 of 0.24 ppm and the 28th day of 2.51 ppm. Despite the decreased antioxidant activity, but each of the stocks included in the category of very powerful antioxidants.

Protective potential of Lactobacillus species in lead toxicity model in broiler chickens

To alleviate adverse effects of heavy metal toxicity, diverse range of removing methods have been suggested, that is usage of algae, agricultural by-products and microorganisms. Here, we investigated lead (Pb) biosorption efficacy by two lactic acid bacteria species (LABs) in broiler chickens. In an in vitro study, Pb was added to culture medium of LABs (Lactobacillus pentosus ITA23 and Lactobacillus acidipiscis ITA44) in the form of lead acetate. Results showed that these LABs were able to absorb more than 90% of Pb from the culture medium. In follow-up in vivo study, LABs mixture was added to diet of broiler chickens contained lead acetate (200 mg/kg). Pb exposure significantly increased lipid peroxidation and decreased antioxidant activity in liver. The changes were recovered back to normal level upon LABs supplementation. Moreover, addition of LABs eliminated the liver tissue lesion and the suppressed performance in Pb-exposed chicks. Analysis of liver and serum samples indicated 48% and 28% reduction in Pb accumulation, respectively. In conclusion, results of this study showed that L. pentosus ITA23 and L. acidipiscis ITA44 effectively biosorb and expel dietary Pb from gastrointestinal tract of chickens.

Lower Serum Catalase Level is Associated with Preterm Labor among Pregnant Women at Sanglah Hospital Denpasar, Bali-Indonesia

Background: Preterm labor is still become a serious health problem in Obstetric and Perinatology with no sensitive biomarker currently approved. Several studies show that decrease antioxidant activity may play significant role in preterm labor. However, only few studies had been conducted to evaluate blood catalase level in preterm labor and assess its role in preterm labor. Objective: The aim this study was to identify the differences of maternal serum catalase level in preterm labor compared with preterm pregnancy. Methods: An observational analytic cross sectional study was conducted from February to December 2014 using pregnant women with 28-36 weeks’ gestational age. Blood catalase level was evaluated by colorimetric method and the data was analyzed by SPPS for Windows 17.0 program. Results: 12 subjects were enrolled and divided into preterm and control group. No significant differences between mean age, gestational age, and parity between preterm and control group. However, blood catalase level was significantly lower in preterm group compared with control group (81.82 ± 20.38 vs 159.38 ± 35.79; p=0.001). Conclusion: Serum maternal catalase level were significantly lower in preterm labor compared with preterm normal pregnancy.

Chemical composition, antioxidant potential and phenolic profile of oil mill waste water from Tunisian olive varieties (Chetoui and Chemlali)

Oil mill waste water (OMWW) is of great interest due to the presence of valuable resources such as biophenols that can be recovered as food additives and pharmaceuticals. The aim of this study is to investigate the variation of physicochemical composition of OMWW from Chetoui and Chemlali varieties, to evaluate phenolic composition, antioxidant potential and phenolic profile of OMWW extracts under native and acidified conditions. Liquid-liquid extraction was performed for the extraction of polyphenols. Antioxidant activity was investigated by DPPH•, ABTS•+ and FRAP tests. Phenolic compounds content was determined by HPLC-DAD method. OMWW from Chetoui variety has been shown to contain an important amount of K, Ca and Na whereas Chemlali cultivar was rich in Mg. Phenolic extract from Chetoui fruit (COCt) has been shown to contain the highest amount of polyphenols (2.48 ± 0.21 g L-1) as well as an appreciable content of flavonoids (9.39 ± 0.32 g L-1). However, phenolic extract from Chemlali fruit (COCm) has been shown to have the highest content of proanthocyanidins (0.39 ± 0.00 g L-1). Acidification treatment improved polyphenol recovery of extracts from both varieties. COCt was more active using DPPH (EC50 of 7.5 mg L-1) and FRAP tests. However, COCt and COCm exhibited the same activity using ABTS test. In general, acidification treatment decreased antioxidant activity of extracts. COCt has been shown to contain higher amount of hydroxytyrosol when compared to COCm (157.16 ± 0.820 and 23.440 ± 0.440 mg g-1 D.W. of extract, respectively) as revealed by HPLC-DAD analysis.Â