Determination of folate in infant formula and adult/pediatric nutritional formula by optical biosensor assay: First Action 2011.05.
After a review of data from a single-laboratory validation (SLV) study published in the International Dairy Journal 21, 783-789 (2011), a method for folate in infant formula and adult/pediatric nutritional formula was submitted for consideration of adoption by AOAC as an automated assay that is rapid and simple. The method uses an optical biosensor assay to quantitate total folate content in milk and milk-based pediatric and adult nutritional products. The assay uses folate binding protein and a functionalized sensor surface. The SLV showed an instrumental LOD of 0.1 ng/mL (equivalent to 2.5 microg/100 g for a typical infant formula). The method detection limit was 6.5 microg/100 g with a repeatability of 3.48% and an intermediate reproducibility of 4.63% RSD.
Fonterra Co-operative Group Ltd, Waitoa, New Zealand. harvey.indyk@fonterra.com
Harvey
H
Indyk
Dawn
D
Dowell
D000328:Adult; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D002648:Child; D005492:Folic Acid / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods; D005526:Food, Formulated / Q000032:analysis*; D006801:Humans; D007223:Infant; D041943:Infant Formula / Q000737:chemistry*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014815:Vitamins / Q000737:chemistry*
D014815:Vitamins; D005492:Folic Acid