The objective of this study was to determine if interaction between phytochemical mixtures and low level exposure to pesticides would modify tissue endogenous antioxidants in rats. Two experiments were conducted using dietary flavonoid (F) and oral pesticide (P) mixtures (FM, PM) on changes in the activities of superoxide dismutase (SOD), glutathione peroxidase (GPX) and glutathione concentrations (GSH) in male Sprague Dawley rats (150-175 g) fed for 2 or 4 weeks the AIN 93M diet with or without equal amounts of quercetin, rutin, catechin (FM) at 1.0 mM or 5 mM/kg diet, and with/without PM fed orally at 0.
View Article and Find Full Text PDFTwo 30-day experiments (36 male Sprague-Dawley rats each) were conducted to determine effect of administering flavonoid mixture (FM) with concomitant exposure to a pesticide mixture (PM) or FM at varied levels on changes in concentrations of zinc and copper in tissues. In experiment 1, PM = chlorpyrifos, endosulfan, and thiram at 25% LD(50) was dissolved in soybean (SB) oil and gavage-fed 0.1 mL 5 days/week; FM in SB oil was mixed in AIN-93M diet at 1.
View Article and Find Full Text PDFThe objective of this study was to assess the risk of genotoxicity caused due to oxidative stress using plasma and urinary levels of 8-hydroxy-2-deoxyguanosine (8-OHdG) in farm workers for six months during a growing season. Blood and urine samples were collected once a month for six months (June to November 2003) from farm workers (n = 15) and urban unexposed controls (n = 10). Plasma and urinary levels of 8-OHdG were evaluated by Enzyme Linked Immunosorbent Assay (ELISA) technique.
View Article and Find Full Text PDFChronic low-level exposure to synthetic pesticides is implicated in many health conditions that result from the induction of oxidative stress, including cytogenetic damage. The objective of this study was to assess the risk of genotoxicity using micronuclei (MN) formation in lymphocytes and to determine changes in blood antioxidants superoxide dismutase (SOD) in erythrocytes (E) and glutathione (GSH) in E and plasma (PL) in farm workers for six months during a growing season. Blood and urine samples were collected once a month for six months (June to November 2003) from farm workers (n = 15) and urban unexposed controls (n = 10).
View Article and Find Full Text PDFMale Sprague-Dawley rats, weighing 175-200 g, six per group were fed AIN 93M diet (CON) or diets containing 500 mg Ca (LCa), 7 mg Zn (LZn), 2 mg Cu (LCu), 60 mg Zn (HZn), or 12 mg Cu (HCu) per kilogram of diet in the following combinations: control (CON), LCa+LZn (LC+Z), LCa+LZn+LCu (LC+Z+C), or HZn+HCu (HZ+C) without or with a pesticides mixture (PM); Endosulfan, Thiram, and Acephate were added to the diets at 25% of LD50/kg. Rats were fed for 2 wk (small intestinal changes) or 4 wk (tissues changes). Plasma Zn was 47% lower than CON in the experimental groups.
View Article and Find Full Text PDFBecause plate waste reduces nutritional benefits of school lunches, the objective of this study was to determine the factors that influence waste. Lunches of 743 sixth graders in three middle schools were photographed after students made food selections and after eating. Sample items were purchased to determine initial portion weights.
View Article and Find Full Text PDFJ Environ Sci Health B
October 2005
Two experiments were conducted in male Sprague Dawley (SD) rats (175-200 g) to determine changes in the activities of endogenous antioxidants superoxide dismutase (SOD), glutathione peroxidase (GPX), cytochrome P450 (ethoxyresorufin deethylase; EROD) and concentrations of glutathione (GSH) in the blood, liver, and small intestinal mucosa (IM). In both experiments, six rats/group were fed diets based on the AIN-93M diet (Control) or the same modified to contain either 500 mg calcium (Low Ca), 7 mg Zn (Low Zn): 2 mg copper (Low Cu), 60 mg zinc (High Zn) or 12 mg copper (High Cu) in the following combination: Control, LCa/LZn, LCa/LZn/LCu, or HZn/HCu, with and without a pesticide mixture containing acephate, endosulfan, and thiram at 25% LD50 for four or two weeks. Pesticides decreased feed intake and weight gain in all groups by 28%.
View Article and Find Full Text PDFObjective: To determine the influence of competitive foods on energy and nutrient intakes of adolescents participating in a school lunch program.
Design: Weighed plate waste data were used to assess the energy and nutrient consumption from school lunch menus items and competitive food items chosen and consumed by adolescents. The two test groups were students choosing competitive foods and those choosing no competitive foods.
Two experiments were conducted in male SD rats (225-250 g) to determine changes in the activities of endogenous antioxidants superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPX) and concentrations of glutathione (GSH) in tissues after exposure to low doses of endosulfan and chlorpyrifos using a whole body exposure technique. In both experiments, 6 rats/group were exposed 3 hr/day, 5 days/week for 30 days to: 0 (control), 5, 10, 20, 40 and 60% of LD50 of either pesticide in 50% ethanol; actual concentrations were: endosulfan = 0, 0.5, 1.
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