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Lin Q.-B.,University of Jinan | Lin Q.-B.,Shanxi University | Li H.,Shanxi University | Zhong H.-N.,Guangdong Border Inspection and Quarantine Technology Center | And 3 more authors.
Analytical Letters | Year: 2014

Titanium was determined in nano-titanium(IV) oxide food packaging by microwave digestion with inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). Microwave digestion was optimized using different acid combinations. Both spectrometry techniques showed good reproducibility, repeatability, and recovery. For ICP-AES, the limit of detection was 5.0 mg kg-1, the linear dynamic range was 100-5000 μ g L-1, the average recoveries for blank samples spiked with titanium were between 94.7% and 100.1%, and the relative standard deviations were from 2.1% to 7.1%. By ICP-MS, the limit of detection was 0.3 mg kg-1, the linear dynamic range was 0.5-200 μ g L-1, the recoveries were 88.4%-96.3%, and the relative standard deviations were 6.3%-7.4%. These results indicated that methods were effective for the determination of titanium in food packaging. © 2014 Copyright Taylor & Francis Group, LLC. Source


Lin Q.-B.,Jinan University | Lin Q.-B.,Shanxi University | Li H.,Jinan University | Li H.,Shanxi University | And 4 more authors.
Food Additives and Contaminants - Part A Chemistry, Analysis, Control, Exposure and Risk Assessment | Year: 2014

An analytical method based on ICP-MS was developed for the determination of Ti in food simulants (3% (w/v) aqueous acetic acid and 50% (v/v) aqueous ethanol). The method was used to determine the migration of Ti from nano-TiO2-PE films used for food packaging into food simulants under different temperature and migration time conditions. The maximum migration amounts into 3% (w/v) aqueous acetic acid were 1.4 ± 0.02, 6.3 ± 0.5 and 12.1 ± 0.2 μg kg-1 at 25, 70 and 100°C, respectively, while into 50% (v/v) aqueous ethanol, the maximum migration amounts were 0.5 ± 0.1, 0.6 ± 0.03 and 2.1 ± 0.1 μg kg-1 at 25, 70 and 100°C, respectively. Increasing the additive content in the film promoted migration of nanoparticles. The results indicated that the migration of nanoparticles might occur via dissolution from the surface and cut edges of the solid phase (film) into the liquid phase (food simulant). © 2014 © 2014 Taylor & Francis. Source

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