Proteins, biological polymers composed of amino acids, have primary structures indicating the sequence of amino acids and higher three-dimensional order structures as well. The structure of proteins defines their biological functionality and CD spectroscopy is commonly used in the study of proteins and oligopeptide applications. Using secondary structure estimation (SSE) software, the helix, sheet and random coil contents of unknown proteins can be quantitatively estimated from CD spectra. SSE software has been applied mainly in academic or research studies of protein structure. JASCO now offers the new SSE Program based on the PLS/PCR method of multivariate analysis, to cope with expanding usage of protein studies across a wide range of fields, su JASCO圓二色光譜儀CD J-1500