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Related Concept Videos

Urine Studies I: Urinalysis01:29

Urine Studies I: Urinalysis

Urinalysis is a widely used diagnostic test that analyzes urine's physical, chemical, and microscopic characteristics. Healthcare providers use it to detect and monitor various health conditions, including renal disease, urinary tract infections (UTIs), diabetes, and metabolic or systemic disorders.Components of UrinalysisUrinalysis consists of three primary components: physical, chemical, and microscopic examination. Each provides unique insights into the urine sample and, by extension, the...
Urine: Physical and Chemical Properties01:18

Urine: Physical and Chemical Properties

Urine comprises approximately 95% water and 5% solutes. The primary ingredient, apart from water, is urea - a byproduct of the breakdown of amino acids. Other notable components include uric acid, a residue from nucleic acid metabolism, and creatinine, a metabolite from creatine phosphate breakdown in skeletal muscle tissue.
The concentration of these solutes varies, with urea being the most abundant nitrogenous waste product. Other solutes include sodium, chloride, potassium, phosphate,...
Urine Studies II: Urine Culture and Sensitivity Test01:26

Urine Studies II: Urine Culture and Sensitivity Test

A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...
Formation of Dilute Urine01:20

Formation of Dilute Urine

The formation of dilute urine is a critical renal adaptation that maintains fluid balance, particularly during periods of high fluid intake. This process primarily involves the juxtamedullary nephrons. By adjusting the permeability of water and ions in response to physiological conditions, the kidneys can either conserve or excrete water, resulting in concentrated or dilute urine.
Filtrate Osmolarity in the PCT
Initially, as the filtrate passes through the proximal convoluted tubule (PCT), its...
Renal Drug Excretion: Tubular Secretion01:28

Renal Drug Excretion: Tubular Secretion

Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...
Hydrolysis of Chlorobenzene to Phenol: Dow Process01:10

Hydrolysis of Chlorobenzene to Phenol: Dow Process

Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is eliminated to generate the benzyne...

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Related Experiment Video

Updated: Jun 16, 2026

O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression
06:50

O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression

Published on: November 8, 2019

Urinary o-cresol in toluene exposure.

P Pfäffli1, H Savolainen, P L Kalliomäki

  • 1Department of Industrial Hygiene and Toxicology, Institute of Occupational Health, Helsinki, Finland.

Scandinavian Journal of Work, Environment & Health
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

Urinary o-cresol levels linearly correlate with toluene vapor exposure. This metabolite measurement offers a practical method for assessing solvent exposure and potential toluene toxicity.

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O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression
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Area of Science:

  • Occupational health
  • Toxicology
  • Analytical chemistry

Background:

  • Toluene exposure is common in industrial settings.
  • Assessing toluene exposure requires reliable biomarkers.
  • Toluene toxicity is linked to intermediate metabolites.

Purpose of the Study:

  • To establish a quantitative relationship between inhaled toluene and urinary o-cresol.
  • To validate urinary o-cresol as a biomarker for toluene exposure.
  • To explore the toxicologic significance of o-cresol in toluene exposure.

Main Methods:

  • Urine samples (20 ml) underwent acid hydrolysis.
  • Phenolic compounds were extracted using dichloromethane.
  • Gas chromatography was employed for quantitative analysis.

Main Results:

  • A linear relationship was observed between urinary o-cresol and toluene vapor exposure.
  • The analytical method demonstrated a low limit of detection (0.5 micromol/l).
  • A practical limit of 2.5 micromol/l for exposure testing was established, correlating to 5 ppm toluene.

Conclusions:

  • Urinary o-cresol is a reliable biomarker for monitoring toluene exposure.
  • The method provides a sensitive and practical approach for occupational health assessments.
  • The findings suggest potential indirect toxicologic relevance due to arene oxide involvement.