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Expressing urine from a gel disposable diaper for biomonitoring using phthalates as an example

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Expressing urine from a gel disposable diaper for biomonitoring using phthalates as an example.htm (408bytes)
Date
2012-11
Author
Liu, Liangpo
Xia, Tongwei
Guo, Lihua
Cao, Lanyu
Zhao, Benhua
赵本华
Zhang, Jie
Dong, Sijun
Shen, Heqing
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  • 医学院-已发表论文 [2663]
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Abstract
The urinary metabolites of phthalates are well-accepted exposure biomarkers for adults and children older than 6 years but are not commonly used for infants owing to non-convenient sampling. In the light of this situation, a novel sampling method based on monitoring the urine expressed from the gel diaper was developed. The urine was expressed from the gel absorbent after mixing the absorbent with CaCl2 and then collected by a laboratory-made device; the urinary phthalate metabolites were extracted and cleaned using a solid-phase extraction (SPE) column and analyzed with high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry / mass spectrometry. To evaluate the method's feasibility, the following factors were investigated: the proportion of CaCl2 to gel absorbent, the urination volume variation and the target compounds' deposition bias in the diaper, the matrix blank of the different diaper brands, the storage stabilities and the recoveries of creatinine and phthalate metabolites in the expressed urine. Mono-methyl phthalate, mono-ethyl phthalate, mono-butyl phthalate, mono-benzyl phthalate, mono-2-ethylhexyl phthalate and mono-2-ethyl-5-oxohexyl phthalate were involved. 70-80% of the urine can be expressed from the diaper, and the expressed spiking recoveries and the limit of detection of mono-phthalates ranged from 88.5-115% and 0.21-0.50 ng/ml. The method was applied to measure phthalate metabolites in 65 gel diaper samples from 15 infants, and the pilot data suggests the infants are commonly exposed to phthalates. In summary, the method for monitoring of infant exposure to phthalates is sound and validated, and the potential health effects from the vulnerable infants' exposure to phthalates should be concerned.
Citation
JOURNAL OF EXPOSURE SCIENCE AND ENVIRONMENTAL EPIDEMIOLOGY,2012,22(6):625-631
URI
http://dx.doi.org/10.1038/jes.2012.51
WOS:000309989900011
https://dspace.xmu.edu.cn/handle/2288/14314

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