NanoDrop ND-8000 sample retention system

The 8-sample retention system used by the NanoDrop^® ND-8000 is one of the key features of the instrument. Eight samples are simultaneously captured between an array of upper and lower optical surfaces, eliminating the need for cuvettes and capillaries. This saves on the cost of disposable cuvettes and/or on the time and effort spent in cleaning reusable ones.

NanoDrop ND-8000 sample retention system With the sample apparatus open, eight 1ul samples are pipetted directly onto the array of optical surfaces.
	When the sample apparatus is closed, the sample arm slightly compresses the droplets and a sample column is formed. Surface tension alone holds the samples in place. A spectral measurement and quantification of each sample is made based on the tightly controlled path length of 1mm.
When the measurements are complete, the sample apparatus is opened and the samples are simply wiped from both upper and lower optical arrays with an ordinary dry laboratory wipe.
Since the samples are not contained in a secondary vessel, the samples directly wet the system optics, reducing the variations resulting from changing and/or repositioning cuvettes. When the samples are removed, the optics can be easily cleaned making it possible to measure successive sample varying by more than 1000 fold in concentration with no carryover.