Saito M.,JASCO Corporation
Journal of Bioscience and Bioengineering | Year: 2013
In the early days of supercritical fluid chromatography (SFC), it was categorized as high-pressure or dense gas chromatography (HPGC or DGC) and low boiling point hydrocarbons were used as supercritical mobile phase. Various liquids and gases were examined, however, by the late 1970s, carbon dioxide (CO2) became the most preferred fluid because it has low critical temperature (31.1°C) and relatively low critical pressure (7.38 MPa); in addition, it is non-toxic, non-flammable and inexpensive. A prototype of a modern packed-column SFC instrument appeared in the late 1970s. However, in the 1980s, as open tubular capillary columns appeared and there was keen competition with packed columns. And packed-column SFC at once became less popular, but it regained popularity in the early 1990s. The history of SFC was of " the rise and fall." Advances in chiral stationary phase took place in the early 1990s made packed-column SFC truly useful chiral separation method and SFC is now regarded as an inevitable separation tool both in analytical and preparative separation. © 2012 The Society for Biotechnology, Japan. Source
Jasco Corporation | Date: 2011-05-24
A simple method and apparatus for circular dichroism spectrophotometry are provided that allow a liquid, cream-type, and gel-type specimens having a low degree of transparency to be measured directly and nondestructively without passing light through the specimens. Right-handed or left-handed circularly polarized light enters a prism from an entrance face and hits a specimen mounting face of the prism, on which a specimen is placed, at an angle of 80. Then, after being totally reflected by the specimen mounting face and going out from an exit face, the light is detected, and the absorbance is determined.
Jasco Corporation | Date: 2012-12-07
A high-pressure fluorescence flow cell comprises a cell body made of a light-transmissive material, wherein the cell body is penetrated by a straight-line flow path for a high-pressure fluid, wherein the flow path is formed with a cross section of 0.1 mm where indicates the tensile stress (MPa) of the material of the cell body, and P indicates the withstand pressure (MPa) of the cell body.
Jasco International Co. and Jasco Corporation | Date: 2011-04-13
Jasco Corporation | Date: 2012-08-02
The figure is fixed in a given position. If peaks are seen in the positive Y direction, the minimum value of the difference in height between the spectrum and the figure in the range where the figure is present on the X-axis. The minimum value and the height of the figure at the reference point are added. The figure is moved within a range containing the reference point, and the minimum value of the difference in height between the spectrum and the figure is added to the height of the figure at the reference point, at each point on the figure. A maximum value L