期刊
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
卷 879, 期 25, 页码 2507-2512出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jchromb.2011.07.001
关键词
Ultrasound-assisted dispersive; liquid-liquid microextraction; Phthalate esters; Gas chromatography; Bottled milk products
资金
- National Natural Science Foundation of China [20905019, 21011140338]
- Natural Science Foundation of Hebei [B2010000209]
- Hebei University [y2008137]
- Science Foundation of Education Department of Hebei Province [CPRC003]
A new method was developed for the simultaneous determination of six phthalate esters in bottled milks using ultrasound-assisted dispersive liquid-liquid microextraction (UA-DLLME) followed by gas chromatography-flame ionization detection (GC-FID). 0.8 mL of methanol (dispersant) and 40 mu L of CCl(4) (extractant) were injected into 8.0 mL of milk solution and then emulsified the mixture by ultrasound for 2.0 min to form the cloudy solution. Under the optimum condition, the enrichment factors of the analytes ranged from 220 to 270 fold and the recovery ranged from 93.2% to 105.7%. Good linearity was observed for all analytes in a range of 0.8-51 ng g(-1) with the correlation coefficient (r(2)) >= 0.9992. The limits of detection (LODs) based on signal to noise of 3 were 0.64-0.79 ng g(-1). The repeatability evaluated as intra-day and inter-day precision (relative standard deviation, RSD) were less than 4.0% (n = 5). The presented UA-DLLME-GC-FID method was successfully applied to determine the six phthalate esters in different bottled milk products. (C) 2011 Elsevier B.V. All rights reserved.
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