Separation and determination of inorganic cations in beverages by capillary electrophoresis with indirect UV detection

• Authors: Jinzhang Gao , Haifeng Fan , Wu Yang , Xiangli Sun , Chongyang Li , Xuefeng Mao , Jie Wang , Rong Wang , Zhengping Jia
• Languages of publication: EN

Abstracts

EN

A rapid, simple and reliable capillary electrophoresis method for the separation and quantitation of inorganic cations with indirect UV detection at 214 nm was developed. The electrolyte was: 12 mM imidazole as background absorbance provider; 5 mM malic acid and 1.0 mM 18-crown-6 ether as complexing agents; and 20% D2O (v/v) to improve ion mobility. The pH was 4.25. The applied voltage was 22 kV at 22°C. Nine ions were completely separated and determined with correlation coefficients of 0.9979-0.9992. The relative standard deviations (RSD) were less than 0.5% for migration time and less than 5.2% for peak area (n=8). The detection limits (S/N=3) were from 0.08 mg L−1 (for Na+) to 0.51 mg L−1 (for Cu2+). To assess the reliability atomic absorption (AA) was also used to determine the same samples. Satisfactory results were obtained for real samples of jasmine tea drink and coconut milk. [...]

Keywords

EN

Capillary electrophoresis; Inorganic cations; Beverages; Malic acid; D2O

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2008
• Volume: 6
• Issue: 4
• Pages: 617-621

Dates

published

1 - 12 - 2008

online

28 - 10 - 2008

Contributors

author

Jinzhang Gao

• College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

author

Haifeng Fan

• College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

author

Wu Yang

• College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

author

Xiangli Sun

• College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

author

Chongyang Li

• College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

author

Xuefeng Mao

• College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

author

Jie Wang

• College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

author

Rong Wang

• Lanzhou General Hospital for PLA, Lanzhou, 730070, China

author

Zhengping Jia

• Lanzhou General Hospital for PLA, Lanzhou, 730070, China

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Identifiers

DOI

10.2478/s11532-008-0051-2