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Twenty-four-hour temporal trend of melamine and its derivatives in urine in association with meal consumption: a panel study in Shanghai, China

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Abstract

Timing of sampling is important for the exposure assessment of melamine (MEL) and its derivatives. This study aimed to investigate whether MEL and its derivatives in spot urine can effectively represent individual exposure levels throughout the day in adults and to explore their temporal trend before and after meal consumption for helping understand the timing of sampling and for assessing the potential exposure risk. This is a 2-day panel study with 43 college students being enrolled to provide urine specimens in 24 h (from the morning of the first day to the second day) and to answer a questionnaire on demographic characteristics, physical measurements, and time of having meal. Spearman correlation and Wilcoxon rank-sum test were used to examine the associations of the urinary concentrations of MEL and its derivatives in different sampled times and compare the concentrations’ differences before and after meal consumption. Urinary concentrations of MEL and its derivatives (ammeline (AMN), ammelide (AMD), and cyanuric acid (CYA)) in the first-morning urine at the second day and randomly selected spot urine were positively associated with the average concentrations in the previous 24-h urine (all P ≤ 0.002). Urinary MEL concentration increased rapidly after meal consumption, reaching a maximum at approximately 3 h and then decreased gradually towards baseline (P = 0.006). Two subjects (4.65%) had a cumulative daily intake exceeding the severest tolerable daily intake. MEL and its three derivatives in spot urine can effectively represent the average concentrations in the previous 24-h urine in adults. Meal consumption is still a notable source of exposure to MEL for humans. These findings are important for choosing a better sampling strategy of performing exposure assessment. Meanwhile, the acute elevation in urinary MEL concentration following meal consumption may pose a potential health risk.

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Abbreviations

MEL:

melamine

AMN:

ammeline

AMD:

ammelide

CYA:

cyanuric acid

WHO:

World Health Organization

HQ:

hazard quotients

FMU:

first-morning urine

RSU:

randomly selected urine specimen

UPLC-MS/MS:

ultra-performance liquid chromatography–tandem mass spectrometry

LOD:

limit of detection

LOQ:

limit of quantitation

RSDs:

relative standard deviations

CDI:

cumulative daily intake

TDI:

tolerable daily intake

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Funding

This study was funded by the National Natural Science Foundation of China (Grant number: 82173520) and the Zhejiang Provincial Basic Public Welfare Research Project (the Analysis and Measurement Foundation) (Grant Number: LGC20B050005).

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Authors and Affiliations

Authors

Contributions

We would like to thank all the participants for their participation and kind assistance. S.L. and B.C. contributed to the conception and study design; S.L., Y.W., Z.Y., and B.C. contributed to the acquisition of data; S.L. and B.C. performed data analysis; S.L. and B.C. contributed to the interpretation of the data; S.L., R.D., and B.C. contributed to manuscript writing; G.H. and B.C. critically revised the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Bo Chen.

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Ethical approval

The study was approved by the Medical Research Ethics Committee of the School of Public Health at Fudan University (approval number: 2021-TYSQ-03-72). We hereby certify that this manuscript represents original work and has not been submitted or published elsewhere. We confirm that all data and information presented in this manuscript are accurate and authentic to the best of our knowledge.

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Informed consent was obtained from all individual participants included in the study.

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The authors of this manuscript, titled Twenty-four-hour temporal trend of melamine and its derivatives in urine in association with meal consumption: a panel study in Shanghai, China, hereby provide their full consent for its publication in the Journal of Environmental Science and Pollution Research.

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The authors declare no competing interests.

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Liu, S., Dong, R., Wang, Y. et al. Twenty-four-hour temporal trend of melamine and its derivatives in urine in association with meal consumption: a panel study in Shanghai, China. Environ Sci Pollut Res 30, 120225–120235 (2023). https://doi.org/10.1007/s11356-023-30740-0

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