title: Prediction of serum total antioxidant activity from the concentration of individual serum antioxidants.
abstract: BACKGROUND
  Redox mechanisms are implicated in the pathogenesis of many diseases and several assays of total antioxidant capacity (TAOC) have been reported. Large epidemiological databases contain information on individual serum antioxidants as well as disease-specific phenotypic data. However, antioxidants work co-operatively in biological systems and it is important to be able to translate individual antioxidant measures into those of global antioxidant defence. Models therefore need developing to quantify contributions made by individual species to global antioxidant defence.
  
  
  OBJECTIVE
  To develop a predictive model that translates individual antioxidant concentrations into an index of TAOC, enabling interrogation of epidemiological databases that contain information about individual antioxidants, but not about TAOC.
  
  
  METHODS
  Sera from 256 volunteers were simultaneously assayed for key antioxidants and TAOC by enhanced chemiluminescence (TAOC(ECL)). A predictive model was developed for serum TAOC using multiple linear regression analysis.
  
  
  RESULTS
  The model explained 86% of TAOC(ECL) variability in serum. The strongest predictor of TAOC(ECL) was uric acid (1 SD increase associated with TAOC(ECL) increase of 103 micromol/l Teq-95% CI: 96.8-109), followed by vitamins A, C, E.
  
  
  CONCLUSIONS
  The reported model represents a powerful tool for interrogating databases where individual serum antioxidant concentrations are known, and TAOC measures are required.
authors.affiliation: Clinical Pharmacology Unit, The University of Edinburgh, Queens Medical Research Institute, Edinburgh, Scotland, UK.
authors.forename: Simon R
authors.initials: SR
authors.lastname: Maxwell
authors.forename: Thomas
authors.initials: T
authors.lastname: Dietrich
authors.forename: Iain L C
authors.initials: IL
authors.lastname: Chapple
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D006801:Humans; D049449:Luminescence; D010084:Oxidation-Reduction; D044967:Serum
chemical_list: D000975:Antioxidants