Document Detail

Comparison of analytical methods to determine sodium content of low-sodium foods.
MedLine Citation:
PMID:  20480911     Owner:  NLM     Status:  MEDLINE    
U.S. nutrition labeling regulations require the declaration of sodium content on food products. Accurate and reproducible determination of Na in foods with low Na content (< 140 mg/serving) is challenging because of laboratory contamination. Within-laboratory performance of inductively coupled plasma/MS (ICP/MS), flame atomic absorption spectrophotometry (FAAS), ion-selective electrode (ISE), and potentiometric titration of chloride ion were evaluated in 17 low-sodium foods. For 13 types of food, statistically significant differences (P < 0.05) exist between the within-day andlor interday means obtained by ICP/MS, FAAS, and ISE. Median within-day and interday precent RSD values were 2.7 and 6.1, 3.5 and 3.2, and 5.6 and 6.2%, respectively, by ICP/MS, FAAS, and ISE. The fewest matrix effects were found with ICP/MS, followed by FAAS, and ISE. FAAS gave higher results in a variety of matrixes when compared to ICP/MS and/or ISE. ISE did not perform well in fatty foods or at very low Na concentrations. Manufacturers' Nutrition Facts Panel sodium declarations exceeded levels found by analysis in > 70% of the foods. Analysis of chloride content does not produce reliable Na estimates in low-sodium foods, even when added sodium chloride is present. Methodological issues and contamination sources are discussed.
Stefan Ehling; Sebhat Tefera; Robert Earl; Shannon Cole
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of AOAC International     Volume:  93     ISSN:  1060-3271     ISO Abbreviation:  J AOAC Int     Publication Date:    2010 Mar-Apr
Date Detail:
Created Date:  2010-05-19     Completed Date:  2010-06-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9215446     Medline TA:  J AOAC Int     Country:  United States    
Other Details:
Languages:  eng     Pagination:  628-37     Citation Subset:  IM    
Grocery Manufacturers Association, 1350 I St NW, Suite 300, Washington, DC, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Chemistry Techniques, Analytical
Chlorides / analysis,  chemistry
Diet, Sodium-Restricted
Food Analysis / methods*
Food Handling
Food Labeling
Food Preservation
Mass Spectrometry / methods
Potentiometry / methods
Reproducibility of Results
Sodium, Dietary / analysis*
Spectrophotometry, Atomic / methods
Reg. No./Substance:
0/Chlorides; 0/Sodium, Dietary; 7440-23-5/Sodium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Determination of immunoglobulin G in bovine colostrum and milk powders, and in dietary supplements o...
Next Document:  Assessing analytical variability of measurement of vitamin A in corn-soy blend.