Journal
ANALYTICA CHIMICA ACTA
Volume 764, Issue -, Pages 53-58Publisher
ELSEVIER
DOI: 10.1016/j.aca.2012.12.020
Keywords
Amaranth; Electrochemical determination; Morphology tailoring; Alumina microfiber; Signal enhancement
Categories
Funding
- National Basic Research Program of China (973 Program) [2009CB320300]
- National Natural Science Foundation of China [61071052, 30972798]
- Program for New Century Excellent Talents in University [NCET-11-0187]
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Different-shaped aluminas were readily prepared via hydrothermal reaction. It was found that the morphology and the electrochemical sensing properties of alumina were heavily dependent on the reaction time. When extending the reaction time from 6 h to 24 h, the obtained alumina samples changed from amorphous bumps to regular microfibers in diameter of 200 nm, as confirmed by scanning electron microscopy. Transmission electron microscopy observation revealed that longer reaction time was beneficial for the formation of porous and uniform fiber-like structures. Electrochemical tests proved that alumina microfibers were more active for the oxidation of amaranth and exhibited much higher enhancement effect, compared with alumina bumps. On the surface of alumina microfibers, the oxidation peak currents of amaranth increased remarkably. The influences of pH value, amount of alumina microfibers, and accumulation time on the signal enhancement of amaranth were discussed. As a result, a novel electrochemical method was developed for the detection of amaranth. The linear range was from 1 to 150 nM, and the detection limit was 0.75 nM after 1-min accumulation. The analytical application in drink samples was investigated, and the results consisted with the values that obtained by high-performance liquid chromatography. (C) 2012 Elsevier B.V. All rights reserved.
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