title: Vitamin E content of foods: comparison of results obtained from food composition tables and HPLC analysis.
abstract: OBJECTIVE
  Data on vitamin E content of foods are essential for nutrition research and its application. The aim of this study was to investigate the precision of calculated vitamin E content of prepared meals.
  
  
  METHODS
  The vitamin E content of 69 dishes of a menu cycle sampled at two occasions were calculated using 4 different food composition tables (FCT) and measured by HPLC.
  
  
  RESULTS
  Data were complete for 50-69 dishes. The proportion of dishes with differences between FCTs < or = 20% were 17-100%. Differences between HPLC and the Souci-Fachmann-Kraut table were < or = 20% in 8/46 dishes for alpha- and in 14/46 dishes for gamma-tocopherol. Differences fell in the order of baked > raw > fried/roasted > boiled > mixed prepared foods. The 2 samplings taken 6 months apart showed considerable differences.
  
  
  CONCLUSIONS
  There are substantial differences in calculated/measured vitamin E content of prepared foods: (i) between different FCTs; (ii) between FCTs and HPLC, and (iii) between different seasons. This can be explained by intrinsic variability (breeding, season, country of origin, ripeness, freshness) and food processing, as well as selection of FCTs and should be taken into account when interpreting data of dietary intervention studies.
authors.affiliation: Human Nutrition & Metabolism Research and Training Center Graz, Institute of Molecular Biosciences, Karl-Franzens University, Schubertstrasse 1, A-8010 Graz, Austria.
authors.forename: Isabella
authors.initials: I
authors.lastname: Sundl
authors.forename: Michael
authors.initials: M
authors.lastname: Murkovic
authors.forename: Donata
authors.initials: D
authors.lastname: Bandoniene
authors.forename: Brigitte M
authors.initials: BM
authors.lastname: Winklhofer-Roob
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods / Q000592:standards; D016208:Databases, Factual / Q000592:standards*; D005504:Food Analysis / Q000379:methods* / Q000592:standards*; D005511:Food Handling / Q000379:methods*; D006801:Humans; D012621:Seasons; D013997:Time Factors; D014810:Vitamin E / Q000032:analysis*
chemical_list: D014810:Vitamin E