Gas-chromatographic retention indices are given, in terms of methylene units, for 155 metabolically important compounds (mostly organic acids) as trimethylsilyl derivatives on 10% OV-1 and 10% OV-17 columns. Comprehensive references on metabolic diseases that can be diagnosed by detection of these metabolites are cross-indexed to facilitate the use of the methylene-unit list. With the data pres...

a study was carried out to investigate the effects of organic acid mixture as well as two methionine supplements on performance, carcass characteristics and weight of gastrointestinal tract in broiler chickens. six hundred unsexed day-old ross 308 broiler chicks were utilized in a factorial arrangement of treatments (3×2) based on completely randomized design (crd) of 4 replicates of 25 chicks ...

Accurate information on the organic acids of leaves is surprisingly meager; even the identity of the acidic substances in many of the plant tissues that have been investigated is still in doubt. Franzen and Keyssner (1) pointed out some years ago that the identity of the malic acid had been conclusively proved in only 15 of 235 plants reported in the literature to contain this substance and a s...

a clinical presentation of a metabolic disorder, often first seen in infants who present with poor feeding, vomiting, tachypnea, acidosis, hyperammonemia, ketosis, ketonuria, irritability, and convulsions or hypotonia and lethargy, findings that are otherwise suggestive of neonatal sepsis diseases with oa isovaleric and propionic acidemias, maple syrup urine disease, medium chain acyl dehydroge...

Positive-ion thermospray liquid chromatography-mass spectrometry (TSP-LC-MS) is used to detect organic acids via the direct injection of untreated urine from newborns and infants. Two methods are reported for the separation of organic acids. The separation of urinary organic acids is effected in either an acidic, pH 2.5 sulfuric acid, or a non-acidic, 0.05 M ammonium acetate, pH 6.8, mobile pha...

The aim of this study was to evaluate gastrointestinal microbial population response and performance of broiler chickens fed organic acids and silver nanoparticles coated on zeolite under heat stress condition. In this experiment, 375 one-day old broiler chicks (Cobb 500) were randomly divided into 5 treatments containing 5 replicates with 15 birds in each replicate. Five dietary treatments wer...

A separation and determination of a mixture of 19 low-molecular-mass organic acids usually present in beer samples was developed using coelectroosmotic capillary zone electrophoresis. A polycation (hexadimetrine bromide, HDB) has been added to the electrolyte, which dynamically coats the inner surface of the capillary and causes a fast anodic electroosmotic flow. The main factors affecting reve...