CD spectroscopy is one of indispensable measurement method for protein structure analysis as same as NMR or X-ray crystallography. And small volume or low concentration sample measurement is common request in this market recently. Jasco has developed new technology and application to meet such smallvolume or low-concentration sample measurement condition finally. In this note, we like to show several measurement results by One-drop CD spectra measurements in using of Micro samp領(lǐng) disk (MSD). Keywords: One-drop measurement, Protein, Circular Dichroism JASCO圓二色光譜儀CD J-1500