Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 401, Issue 4, Pages 1393-1399Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-011-5158-1
Keywords
Multi-walled carbon nanotubes; Solid-phase extraction; Liquid chromatography; Speciation; Cobalamins; Seafoods
Funding
- Spanish MICINN [CTQ2009-08267/BQU]
- Fundacion Seneca (Comunidad Autonoma de la Region de Murcia) [15217/PI/10]
- Fundacion Seneca
Ask authors/readers for more resources
Multi-walled carbon nanotubes (MWCNTs) were evaluated as potential adsorbents for miniaturized solid-phase extraction coupled to liquid chromatography. The adsorption capacity of this sorbent was applied to assess the speciation of four cobalamins representing the various forms of vitamin B-12. The preconcentration on the MWCNTs was based on the retention of analytes by introducing the sample online into the mini-column system. Dimethyl sulfoxide was used to elute the retained vitamins for liquid chromatographic analysis. The experimental conditions of the continuous flow device, which affect the enrichment procedure, such as the type and amount of nanotubes, the volume, pH and flow rate of the sample solution, and the eluent and its volume, were optimized. For detection purposes, a diode array device was used and good resolution was obtained with a mobile-phase acetonitrile-phosphate buffer and gradient elution. Specificity was demonstrated by the retention characteristics and UV spectra and by comparing the peak purity index with commercial standards. Linearity, precision, recovery, and sensitivity were satisfactory. Detection limits ranged from 0.35 to 30 ng mL(-1). The method was successfully applied to the determination of cobalamins in seafoods, which were extracted from the sample with a buffer solution using an ultrasonic probe. The reliability of the procedure was checked by analyzing a certified reference material.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available