Spectrophotometric Determination of Magnesium with Sodium 1-Azo-2-hydroxy-3-(2,4-dimethylcarboxanilido)-naphthalene-1´-(2-hydroxybenzene-5-sulfonate)

Mann, Charles K.; Yoe, John H.

doi:10.1021/ac60110a016

Cited by 193 publications

(62 citation statements)

References 6 publications

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“…Methods for analyses of urinary creatinine, urea, calcium and magnesium (atomic absorption flame photometry), and microalbuminuria are given in references. [61][62][63][64] Work is in progress on measurement of urinary amino acids, 65 and multiple nutrients and metabolites by NMR and HPLC. [66][67][68][69][70][71] Pre-prepared reference samples and commercial samples were included daily in analyses to check laboratory variation.…”

Section: Methodsmentioning

confidence: 99%

INTERMAP: background, aims, design, methods, and descriptive statistics (nondietary)

et al. 2003

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Blood pressure (BP) above optimal (p120/p80 mmHg) is established as a major cardiovascular disease (CVD) risk factor. Prevalence of adverse BP is high in most adult populations; until recently research has been sparse on reasons for this. Since the 1980s, epidemiologic studies confirmed that salt, alcohol intake, and body mass relate directly to BP; dietary potassium, inversely. Several other nutrients also probably influence BP. The DASH feeding trials demonstrated that with the multiple modifications in the DASH combination diet, SBP/DBP (SBP: systolic blood pressure, DBP: diastolic blood pressure) was sizably reduced, independent of calorie balance, alcohol intake, and BP reduction with decreased dietary salt. A key challenge for research is to elucidate specific nutrients accounting for this effect. The general aim of the study was to clarify influences of multiple nutrients on SBP/DBP of individuals over and above effects of Na, K, alcohol, and body mass. Specific aims were, in a cross-sectional epidemiologic study of 4680 men and women aged 40-59 years from 17 diverse population samples in China, Japan, UK, and USA, test 10 prior hypotheses on relations of macronutrients to SBP/DBP and on role of dietary factors in inverse associations of education with BP; test four related subgroup hypotheses; explore associations with SBP/DBP of multiple other nutrients, urinary metabolites, and foods. For these purposes, for all 4680 participants, with standardized high-quality methods, assess individual intake of 76 nutrients from four 24-h dietary recalls/person; measure in two timed 24-h urine collections/person 24-h excretion of Na, K, Ca, Mg, creatinine, amino acids; microalbuminuria; multiple nutrients and metabolites by nuclear magnetic resonance and high-pressure liquid chromatography. Based on eight SBP/DBP measurements/person, and data on multiple possible confounders, utilize mainly multiple linear regression and quantile analyses to test prior hypotheses and explore relations of multiple dietary and urinary variables to SBP/DBP of individuals. The 4680 INTERMAP participants are equally divided across four age/gender strata: diverse in ethnicity, education, occupation, physical activity; use of cigarettes, alcohol; diagnosed high BP, CVD, diabetes; CVD family history; women vary in parity, use of contraceptive medication and hormone replacement therapy.

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Section: Methodsmentioning

confidence: 99%

INTERMAP: background, aims, design, methods, and descriptive statistics (nondietary)

et al. 2003

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“…9761208, Fuji Film, Tokyo) and the serum level of insulin was determined by immunoradiometric assay. We also measured the serum concentrations of Na + , K + , and Cl -by the ion selective electrodes method, serum Ca 2+ by the orthocresolphthalein complexone method, 12) serum Mg 2+ by the xylidyl blue method, 13) serum Pi by the molybdic acid method, 14) and serum creatinine by the Jaffe reaction.…”

Section: Treatment and Maintenance Of Ratsmentioning

confidence: 99%

Vanadate Improves Cardiac Function and Myocardial Energy Metabolism in Diabetic Rat Hearts

et al. 2003

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SUMMARYVanadium mimicking the metabolic effects of insulin is known to decrease serum glucose levels and to influence glucose metabolism in diabetes mellitus. However, it is unclear whether vanadium ameliorates the metabolic disorder in diabetic hearts causing myocardial dysfunction. The purpose of this study was to assess the effects of vanadium on cardiac performance and energy metabolism in diabetic rat hearts. Four groups of Wistar rats were studied: untreated control rats (group C, n = 8), vanadate-treated rats (group V, n = 10), untreated diabetic rats (group DM, n = 9) induced by streptozotocin, and vanadate-treated diabetic rats (group DMV, n = 8). Vanadate-treated rats drank a 1.5 mM sodium orthovanadate (Na 3 VO 4 ) solution during a 4 week diabetic condition. Hearts were perfused with Krebs-Henseleit buffer after the diabetic duration. After the maximum left ventricular dP/dt and cardiac efficiency were calculated, the myocardial contents of ATP and creatine phosphate (P-Cr) and myocardial energy metabolism were assessed by cytosolic phosphorylation potential. Peak positive and negative dP/dt, and cardiac efficiency decreased significantly in group DM compared with group C, while there were no significant differences between groups C and DMV. The myocardial contents of ATP (µmol/g wet heart) and P-Cr (µmol/g wet heart), and cytosolic phosphorylation potential (M -1 ) increased from 2.72 ± 0.46, 1.45 ± 0.58, and 3,530 ± 1,220 in group DM to 3.88 ± 0.76, 3.81 ± 1.36, and 11,200 ± 2,400 in group DMV, respectively. It is concluded that vanadium restored the production of high energy phosphates in the myocardium and improved myocardial dysfunction by regulating metabolic processes in diabetic rat hearts. (Jpn Heart J 2003; 44: 745-757)

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“…Sodium and potassium were assayed by flame photometry, 13 and chloride was determined by the Schales & Schales titrimetric method. 14,15 Glucose assays were by enzymatic reaction with glucose oxidase and peroxidase; [15][16][17] 15,19 and total proteins with biuret reagent, 15,20 a n d i n a l l c a s e s a n a l y s i s w a s p e r f o r m e d b y spectrophotometry. Osmolarity was measured with a freezing point osmometer.…”

Section: Methodsmentioning

confidence: 99%

Perfil bioquímico da água de coco de coqueiros de região não litorânea

Vigliar¹,

Sdepanian²,

Fagundes-Neto³

2006

J. Pediatr. (Rio J.)

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Objective: To analyze the biochemical profile of coconut water from dwarf coconut palms planted in non-coastal regions, during the maturation period (sixth to ninth month).Methods: Eight of 15 coconut palms planted in a non-coastal region were selected by lots and their coconuts sent to a laboratory for extraction and analysis of the coconut water. Coconut water from a total of 45 coconuts, from the sixth to ninth months maturity, were analyzed to measure glucose, electrolytes, total proteins and osmolarity and to identify the sugars contained.Results: The analysis of coconut water from the sixth to ninth month did not find any differences in the median concentrations of sodium (3 mEq/L; 2 and 3), glucose (0.6 g/L; 0.3 and 17.3) or total proteins (9 g/L; 6 and 12), but detected a reduction in the concentration of potassium (64 mEq/L; 46 and 99), calcium (6.5 mmol/L; 5 and 8.5), magnesium (8 mmol/L; 3.9 and 9.8), chloride (38.5 mEq/L; 30 and 48.7) and osmolarity (419 mOsmol/L; 354 and 472). With relation to the sugars, identified by chromatography on paper, an increase was observed from the sixth to the ninth month in the concentration of fructose (68 mg/µL; 44 and 320) and glucose (299 mg/µL; 262 and 332) and in conjunction with a concentration of sucrose (340 mg/µL; 264 and 390). Conclusions:The biochemical profile of coconut water varied as the coconuts matured, observing reductions in the concentration of potassium, calcium, magnesium, chloride and osmolarity. Descending paper chromatography revealed an increase in the concentration of fructose and glucose and also a reduction in the concentration of sucrose. J Pediatr (Rio J

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Spectrophotometric Determination of Magnesium with Sodium 1-Azo-2-hydroxy-3-(2,4-dimethylcarboxanilido)-naphthalene-1´-(2-hydroxybenzene-5-sulfonate)

Cited by 193 publications

References 6 publications

INTERMAP: background, aims, design, methods, and descriptive statistics (nondietary)

INTERMAP: background, aims, design, methods, and descriptive statistics (nondietary)

Vanadate Improves Cardiac Function and Myocardial Energy Metabolism in Diabetic Rat Hearts

Perfil bioquímico da água de coco de coqueiros de região não litorânea

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