Intake of foods and drinks containing benzoic acid influences the urinary hippuric acid (HA) concentration, which is used to monitor toluene exposure in Japan. Therefore, it is necessary to control the intake of benzoic acid before urine collection. Recently, some reports have suggested that components of coffee, such as chlorogenic, caffeic, and quinic acids are metabolized to HA. In this stud...

The separation of hippuric and m-methylhippuric acid as toluene and m-xylene metabolites present in urine of people exposed simultaneously to toluene and xylene is described. Chloroform was used for hippuric and m-methylhippuric acid extraction. Satisfactory separation of these metabolites was obtained on TLC plates covered with silica gels and developed in chloroform acetic acid-water (4:1:1);...

I describe modification of the spectrophotometric assay described by Cushman and Cheung [biochem. Pharmacol. 20, 1637 (1971)] for serum angiotensin-converting enzyme, with use of "high-pressure" liquid chromatography to measure the hippuric acid end product. After reaction of 10 microL of untreated serum with the angiotensin-converting enzyme substrate analog hippuryl-L-histidyl-L-leucine, the ...

AIM To compare levels of combined exposure to white spirit, toluene, butyl acetate, ethyl acetate, and xylene in the manufacturing of paint, cartridge, drying, and top-coat sections of paint and lacquer industry, and peripheral nerve conduction parameters in the exposed workers. METHODS The exposed group comprised 120 workers while the control group included 110 workers who had never been exp...

The extensive investigations on the conjugation of benzoic acid, since Wohler’s discovery in 1824 of the synthesis of hippuric acid by the animal, have failed to furnish a comprehensive and definite concept of the metabolic and chemical changes taking place when benzoic acid is introduced into the organism. No attempt has ever been made to explain why man eliminates benzoic acid almost complete...

In the previous paper (Jones & Elliott, 1959) it was shown that rat-kidney mitochondria are able to synthesize nicotinuric acid from nicotinic acid and glycine in the presence of fumarate and adenosine triphosphate (ATP). These experiments showed that nicotinuric acid synthesis is dependent upon a suitable source of energy, but did not give any other indications of the mechanism of the reaction...

OBJECTIVES To evaluate exposure to mixed solvents containing ethylene glycol monoethyl ether acetate (EGEEA) in shipyard painters, to determine if EGEEA is toxic to the bone marrow. METHODS An industrial hygiene survey was performed to identify exposure to EGEEA of two groups of shipyard painters, a low exposure group (n = 30) and a high exposure group (n = 27). Urinary ethoxyacetic acid and ...

The question of the extent of the ability of the human organism to detoxicate benzoic acid by conjugation with glycocoll and elimination as hippuric acid in the urine has frequently been raised. Lewinsk? observed in the urine of men to whom 12 to 20 grams of benzoic acid had been given in small doses during t,he course of twelve hours, neither free benzoic acid nor benzoyl glycuronates. With la...