Competitive chemiluminescent enzyme immunoassay for vitamin B12 analysis in human milk.

Abstract:

:Recent discoveries of matrix interferences by haptocorrin (HC) in human milk and serum show that past analyses of vitamin B12 in samples with high HC content might have been inaccurate (Lildballe et al., 2009; Carmel & Agrawal, 2012). We evaluated two competitive enzyme-binding immunoassays for serum/plasma (IMMULITE and SimulTRAC-SNB) for B12 analysis in human milk. B12-recovery rates (United States Environmental Protection Agency, 2007) were determined to be 78.9 ± 9.1% with IMMULITE and 225 ± 108% (range 116-553%) using SimulTRAC-SNB, most likely due to the presence of excess HC. HC-interferences were not observed with the IMMULITE assay, rendering previously reported mandatory HC-removal (Lildballe et al., 2009) unnecessary. Linearity continued at low B12-concentrations (24-193 pM; r(2)>0.985). Milk B12 concentrations from Bangladeshi women (72-959 pM) were significantly lower than those from California (154-933 pM; p<0.0001) showing IMMULITE's robustness against the complex milk matrix and its ability to measure low milk B12 concentrations.

journal_name

Food Chem

journal_title

Food chemistry

authors

Hampel D,Shahab-Ferdows S,Domek JM,Siddiqua T,Raqib R,Allen LH

doi

10.1016/j.foodchem.2013.12.033

subject

Has Abstract

pub_date

2014-06-15 00:00:00

pages

60-5

eissn

0308-8146

issn

1873-7072

pii

S0308-8146(13)01888-8

journal_volume

153

pub_type

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