Simple click chemistry-based derivatization to quantify endogenous formaldehyde in milk using ultra-high-performance liquid chromatography tandem mass spectrometry in selected reaction monitoring mode.

Sweekruthi, A. Shetty and Rangiah, K. (2020) Simple click chemistry-based derivatization to quantify endogenous formaldehyde in milk using ultra-high-performance liquid chromatography tandem mass spectrometry in selected reaction monitoring mode. Rapid Communications Mass Spectrometry, 34 (19). e8865.

PDF 10.1002@rcm.8865.pdf - Accepted Version Restricted to Registered users only Download (895kB)

Abstract

RATIONALE Formaldehyde (FA) exposure via environmental pollution or through the food chain poses serious threat to human health, especially in developing countries like India. Although the addition of FA to food is proscribed, it is often illegally added to foods such as milk to increase the shelf life. There are challenges in differentiating the endogenous FA content in milk from externally added FA. METHOD We have developed a simple UHPLC/MS/SRM method for the absolute quantification of endogenous FA in milk. The steps include fat removal, protein precipitation using acid, and spiking with labelled FA (FA*), followed by simple click chemistry-based derivatization using Girard P (GP) reagent and final analysis. RESULTS A standard curve with FA* was constructed and used for the calculation of endogenous FA in milk. The optimal conditions for the derivatization reaction using 500 μL of milk were: GP, 50 g; temperature, 37 C; time, 60 min; and 0.1% HCl. The validation parameters such as accuracy (95.84 to 99.73%), precision (2.84 to 8.02%) and spiked recovery (>95%) are within the FDA guidelines. This method is highly sensitive [limit of detection (LOD) of 1 ng/mL] with a dynamic range of 3.12 to 200 ng/mL. The endogenous FA level in pasteurized cow milk is 70 ng/mL (n=60). The FA content in raw milk samples from cow, goat, buffalo (each n=10) varied from 134 to 255 ng/mL. CONCLUSIONS This method is precise and sufficiently sensitive to quantify endogenous FA in milk samples using a minimal sample volume. As it involves simple sample preparation steps, it can be used routinely to quantify endogenous FA.

Item Type:	Article
Uncontrolled Keywords:	Milk, Formaldehyde, Quantification, Derivatization, UHPLC/MS/SRM, Girard P reagent
Subjects:	500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 06 Chromatography 600 Technology > 08 Food technology > 27 Dairy products
Divisions:	Food Safety Analytical Quality Control Lab
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	30 Dec 2020 06:01
Last Modified:	30 Dec 2020 06:01
URI:	http://ir.cftri.res.in/id/eprint/14710

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