Authors:
Ines Klingelhöfer Interdisciplinary Research Center (IFZ) and Institute of Nutritional Science, Heinrich-Buff-Ring 26–32, 35392 Giessen, Germany

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Gertrud E. Morlock Interdisciplinary Research Center (IFZ) and Institute of Nutritional Science, Heinrich-Buff-Ring 26–32, 35392 Giessen, Germany

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Sample application is probably the most important and time-intensive step in high-performance thin-layer chromatography, owing to the fact that sample preparation can be reduced to a minimum. The modern automatic application devices offer a variety of application modes, which allow an exact application of small nanoliter volumes up to the application of the samples in the milliliter range. On the example of 4 parabens, the spotwise, bandwise, or area application was examined. In addition, the differences in the quantitative results were investigated when the same substance amount was applied via different volumes of respectively concentrated solutions. Another important factor in sample application is the dosage speed. This was examined for nine bandwise applications using dosage speeds between 50 and 1400 nL s−1 and three spotwise applications using speeds of 10, 20, and 50 nL s−1. A further point in the investigations was the band length of the application, which can decisively influence the resolution and detectability. Furthermore, it was examined whether there is a difference when the substances are applied as a mixture solution or as individual solutions via so-called overspotting, which means that the individual substance solutions are applied to exactly the same position. In order to investigate matrix effects on the application form, volume, speed, and band length, a honey sample which was spiked with 5-hydroxymethylfurfural was tested under the abovementioned conditions.

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Journal of Planar Chromatography - Modern TLC
Language English
Size A4
Year of
Foundation
1988
Volumes
per Year
1
Issues
per Year
6
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0933-4173 (Print)
ISSN 1789-0993 (Online)

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