<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Borries,<div><br></div><div>The NanoDrop is designed for checking small volumes of highly concentrated solutions. It’s not designed to replace cuvette measurements, but it is convenient for getting values within a few percent for samples that are too small or too concentrated to be measured in a cuvette. We have not checked the linearity. It sounds like repeating the measurements in dilute solutions in a cuvette in your lab would be a good idea.</div><div><br></div><div>What concentration of proteins do you typically run in your 10 mm cells? I am guessing they are in the low micromolar range. Even with the higher MW of proteins, I am guessing that there is a lot less material in solution than our peptides. </div><div><br></div><div>In past studies with peptides. For the 0.1, 0.3, and 0.6 mM solutions in our 2014 JACS paper, you were able to do UV, working about 60 nm away from the UV maximum. For our JACS 2007 paper, you did absorbance scans at 230 nm for the 15 uM sample and and Rayleigh interference for the 1.5 mM and 9 mM samples.</div><div><br></div><div>Best,</div><div>James</div><div><div></div></div></body></html>