Maria Ramos Payan
University of Seville, Spain
Title: Video: New trends in sample miniaturization and its applications: On-chip devices
Biography
Biography: Maria Ramos Payan
Abstract
Sample preparation miniaturization is one of the latest trends in analytical chemistry. The development of new sample
preparation procedures is closely linked to the new on-chip microfluidic devices. These microchips have proven to offer new
advantages over traditional methodologies, such as a decreasement of the reagent volume, organic solvent and sample volume.
It also reduces the analysis time and offers very high extraction efficiencies when working under double flow conditions or
good enrichment factors when working under stationary conditions. These microchips systems have been employed using two
different extraction techniques: liquid phase microextraction and electromembrane. The parameters that affect both extractions
are the composition of the sample and the acceptor phase, the flow of the acceptor and donor phase, the organic solvent used as
a liquid membrane supported and the extraction time. The voltage is one of the extra parameters to be determined in the case
of the electromembrane. However, one of the most influential variables is related to the geometry of these microchips systems,
since depending on their length, width and depth, different extraction and enrichment efficiencies will be obtained. In this
work, new trends in the geometric study of microfluidic devices and their application to both environmental and biological
samples are presented.