Found inside – Page 139The hydrogen sulphide has the effect of reducing dehydro-ascorbic acid back to ... for the oxidation of ascorbic acid as it occurs in the urine is not ... Found inside – Page 146The presence of ascorbic acid in urine can compromise the results obtained ... Ascorbic acid is a strong reducing substance because of its ene-diol group ... Found inside – Page 167Some of the oxidized ascorbic acid used for this experiment was added to a tube in which the benzidine test had given a pink color . Within 5 ... A refinement of the benzidine test recommended by Hawk and Bergeim is the preliminary extraction of the urine with ether ... If ascorbic acid owes all its action to the fact that it is a strong reducing agent , one would expect it to be inert after oxidation with KMnO4 . Found inside – Page 105Megadoses of vitamin C reduce the urinary excretory levels of cysteine (Basu, 1977), a phenomenon which suggests that ascorbic acid therapy may be useful in ... Found inside – Page 94High urinary concentrations of ascorbate (ascorbic acid or vitamin C) can inhibit the enzymatic reaction which will result in a reduced or false-negative ... Found insideThis work responds to the need to find, in a sole document, the affect of oxidative stress at different levels, as well as treatment with antioxidants to revert and diminish the damage. Found inside – Page 722BOX 26-2 Reducing Substances in Urine Fructose Lactose Galactose Maltose Arabinose Xylose Ribose Uric acid Ascorbic acid Creatinine Cysteine Glucose Ketone ... Found inside – Page 125It has been reported that the administration of vitamin C did not reduce the levels of homogentisic acid in alkaptonuric urine [43], but the authors felt ... Found inside – Page 243Effect of high-level ascorbic acid supplementation on urinary oxalate ... acid is regenerated, as the electron acceptor ascorbyl radical is reduced by ... Found inside – Page 354There are present in urine substances in addition to ascorbic acid which will reduce the dye ; however , the dye is decolorized by the ascorbic acid much faster than by the other reducing substances normally present . It is necessary , therefore ... The factors affecting blood vitamin C levels are described in detail in this series. Found insideThis book is a printed edition of the Special Issue "Vitamin C in Health and Disease" that was published in Nutrients Found inside – Page 407oxidase → Gluconic acid + HO2 2 Step 2: HO Reduced of dye 2 2 + ... (as low as 40 mg/dL in dilute urine containing less than 5 mg/dL ascorbic acid) ... Found insideThis book presents new information on uric acid in tubular transport, early recognition of renal lesions, genetic predisposition, preeclampsia, metabolic syndrome, diabetes, high blood pressure in the young, and the relationship with ... Found inside – Page 126calcium and oxalate, reducing the possibility of stones. "Vitamin C in the urine tends to bind calcium and decrease its free form. This means less chance of ... Found inside – Page 368Thereafter, reduced ascorbic acid levels just in excess of those ... ''at low ascorbic acid intake, acetylsalicylic acid increased urinary ascorbic acid, ... "Oxalate Metabolism in Relation to Urinary Stone" is the third monograph to appear in the "Bloomsbury Series". Edited by Alan Rose, the book describes the current clinical and biochemical features of oxalate metabolism. Found inside – Page 63Substances that interfere with the enzymatic reaction or strong reducing agents, such as ascorbic acid, that prevent oxidation of the chromogen may produce ... Found inside – Page 282Vitamin C–Sources and Requirements Vitamin C(ascorbic acid) is a powerful reducing agent, and when oxidized it forms dehydroascorbic acid. Found inside – Page 41... Hemoglobin False-negative Results Urine pH >6.5 Reduced values in presence of formaldehyde — Ascorbic acid High SG of urine Formaldehyde (0.5 g/l) used ... Found inside – Page 97... of monodehydroascorbate and reduce the level of available ascorbic acid . ... levels of tryptophan metabolites in the urine of ascorbic aciddeficient ... Found inside – Page 623However , the oxidation product of d - isoascorbic acid is also reduced . ... The determination of vitamin C in urine , G. T. MEIKLEJOHN and C. P. STEWART ... Found inside – Page 38... pad Bilirubin Ascorbic acid, prolonged standing in light Urobilinogen Broad-spectrum antibiotics, discolored urine, prolonged standing in light REDUCING ... Found inside – Page 134Urinary DES Metabolism . At various intervals after The results of the reduction reactions are implantation of DES pellets , 6 - hour urine samples were compiled in table I. Ascorbic acid was found collected from the three groups of animals . Found inside – Page 6Although magnesium may reduce dietary oxalate absorption, ... Consumption of 1,000 mg of supplemental vitamin C twice daily increased urinary oxalate ... Found inside – Page 484Nitrite Many bacteria that are urinary tract pathogens are able to reduce ... False- negative nitrite results may be due to ascorbic acid, urobilinogen, ... Found inside – Page 719Urinary. tract. Ascorbic acid 4 g/day increases uric acid clearance in volunteers [24], although it does not reduce protein-bound uric acid in blood. Found inside – Page 194The use of ascorbic acid to acidify urine and the increased consumption of water which reduces nutrients and salts utilized by bacteria are believed to ... Found insideMolecular Basis of Nutrition and Aging: A Volume in the Molecular Nutrition Series focuses on the nutritional issues associated with aging and the important metabolic consequences of diet, nutrition, and health. Found inside – Page iDiet and Health examines the many complex issues concerning diet and its role in increasing or decreasing the risk of chronic disease. Found inside – Page 372a complex solution in urine, one that apparently allows calcium and ... D and ascorbic acid intake Low water intake and balance Reduced sodium content ... Found inside – Page 69The main objective should prevent biofilm formation by the prophylactic ... comparative studies of prophylactic administration of ascorbic acid, TMP-SMX, ... Found inside – Page 558temperature within a short, defined time range after dipping into urine. ... Iodate has been incorporated into Chemstrip to reduce ascorbic acid ... Found inside – Page 502the urinary excretion of 4 - amino - imidazole - 5 - carboxamide , suggesting a folic acid deficiency in all patients except those ... Losses of ascorbic acid in urine and exudate cause reduced blood ascorbic acid levels ( Lam , 1941 ; Gefter and ... The factors affecting blood vitamin C levels are described in detail in this series. Found inside – Page 2408Laboratory Test Interferences Because ascorbic acid is a strong reducing agent , it interferes with numerous laboratory tests based on oxidation - reduction reactions . The presence of ascorbic acid in the urine results in false increases in ... Found inside – Page 62For acidic drug, make urine alkaline and vice versa. Opposite pH will render drug (or its metabolite) ionized - less lipid soluble. This will reduce ... Found inside – Page 14Large concentrations of urinary ascorbic acid can also occur with the ... Moderately high ketone levels (40 mg/dL) may reduce the sensitivity and may cause ... Found inside – Page 124Urine dipstick tests: Vitamin C in urine can cause significant ... Copper: Add ascorbic acid to total parenteral nutrition last to minimize drug degradation ... Found inside – Page 31This method is based on the reducing properties of ascorbic acid . ... Interference with Clinical Tests Ascorbic acid interferes with many urine and blood ... Found inside – Page 93This filtration of excess ascorbic acid has been used in some to acidify the urine of nursing home patients to manage and prevent urinary tract infections . Found insideAscorbic acid excreted during 3-hour periods by one individual on diets of varying ascorbic acid content, ... The only one of the reducing agents employed here which is able to reduce the reversibly oxidised compound is H.S. Sulphite, even after 12 hours, reduces it only slightly. ... A method is described for the determination of ascorbic acid in urine by use of Folin's phospho-18-tungstic acid reagent. Found inside – Page 458False-negative nitrite results may be due to ascorbic acid, urobilinogen, ... time required for the chemical reduction to nitrite in the bladder urine. In addition to a more user-friendly organization, new features in this edition include: A significantly expanded section on dietary requirements for rats, reporting substantial new findings. Found inside – Page 81Substances that interfere with the enzymatic reaction or strong reducing agents, such as ascorbic acid, that prevent oxidation of the chromogen may produce ... This volume is the newest release in the authoritative series of quantitative estimates of nutrient intakes to be used for planning and assessing diets for healthy people. Found insideMean gastric concentrations of nitrite and of nitrate - reducing organisms were also lowered by ascorbic acid treatment . ... The excretion of urinary N - nitrosamino acids by inhabitants living in high - risk ( Linxian ) and low - risk ( Fanxian ) ... Found inside – Page 276because of its ability to reduce uric acid synthesis and lower urinary uric acid ... ingested ascorbic acid is excreted unmetabolized in the urine (26,27). 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