A procedure for hydrogenation of alpha dimethyl styrene dimer that is scalable, economical, and safe is provided. These processes routinely provide greater than a 98% yield and require no purification step. The methods of producing hydrogenated alpha dimethyl styrene dimer comprising adding to a reactor under nitrogen a catalyst comprising Ru/C or Rh/C and an alpha dimethyl styrene dimer to form a catalyst and alpha dimethyl styrene dimer reaction mixture. The reaction mixture is then heated under pressure until hydrogenation of the alpha dimethyl styrene dimer is complete. To recover the hydrogenated alpha dimethyl styrene dimer, the reaction mixture is filtered through a celite bed under nitrogen.

A procedure for hydrogenation of alpha dimethyl styrene dimer that is scalable, economical, and safe is provided. These processes routinely provide greater than a 98% yield and require no purification step. The methods of producing hydrogenated alpha dimethyl styrene dimer comprising adding to a reactor under nitrogen a catalyst comprising Ru/C or Rh/C and an alpha dimethyl styrene dimer to form a catalyst and alpha dimethyl styrene dimer reaction mixture. The reaction mixture is then heated under pressure until hydrogenation of the alpha dimethyl styrene dimer is complete. To recover the hydrogenated alpha dimethyl styrene dimer, the reaction mixture is filtered through a celite bed under nitrogen.

A method is provided for preparing a sample of a specimen to be analysed from a thin-layer plate in thin-layer chromatography. The sample is removed from a surface of the thin-layer plate by means of a blade disposed at a receiving opening of a cannula and fed through the cannula to a specimen chamber connected to the cannula. A reduced pressure can be generated in the specimen chamber to suck the sample removed from the thin-layer plate by means of the cannula through the receiving opening into and through the cannula and into the specimen chamber. After removal and feed of the sample, the specimen chamber can be filled with a solvent to dissolve the sample. The cannula with the blade can be deflected against a spring force or the blade can be deflected against a spring force relative to the receiving opening of the cannula at the receiving opening of the cannula to prevent the blade from penetrating into the thin-layer plate with an excessive contact pressure during the removal of the sample from the thin-layer plate.

A method is provided for preparing a sample of a specimen to be analysed from a thin-layer plate in thin-layer chromatography. The sample is removed from a surface of the thin-layer plate by means of a blade disposed at a receiving opening of a cannula and fed through the cannula to a specimen chamber connected to the cannula. A reduced pressure can be generated in the specimen chamber to suck the sample removed from the thin-layer plate by means of the cannula through the receiving opening into and through the cannula and into the specimen chamber. After removal and feed of the sample, the specimen chamber can be filled with a solvent to dissolve the sample. The cannula with the blade can be deflected against a spring force or the blade can be deflected against a spring force relative to the receiving opening of the cannula at the receiving opening of the cannula to prevent the blade from penetrating into the thin-layer plate with an excessive contact pressure during the removal of the sample from the thin-layer plate.

To provide a preparative thin layer chromatography method capable of acquiring a target spot efficiently using a simple and convenient method without the possibility of decomposition of a component in a spot. The preparative thin layer chromatography method is a preparative method for dispensing a spot from a thin layer chromatography plate and includes a process 1 that forms a groove by removing the carrier at the circumferential edge of a spot to be dispensed, a process 2 that inserts a nozzle having a packing part at the tip thereof into the groove formed in the process 1, a process 3 that discharges a solvent through the nozzle, and a process 4 that sucks the solvent in which a spot component has been dissolved.

To provide a preparative thin layer chromatography method capable of acquiring a target spot efficiently using a simple and convenient method without the possibility of decomposition of a component in a spot. The preparative thin layer chromatography method is a preparative method for dispensing a spot from a thin layer chromatography plate and includes a process 1 that forms a groove by removing the carrier at the circumferential edge of a spot to be dispensed, a process 2 that inserts a nozzle having a packing part at the tip thereof into the groove formed in the process 1, a process 3 that discharges a solvent through the nozzle, and a process 4 that sucks the solvent in which a spot component has been dissolved.

Development chambers suitable for use in thin layer chromatography are disclosed. Methods of making and using development chambers in thin layer chromatography are also disclosed.

Development chambers suitable for use in thin layer chromatography are disclosed. Methods of making and using development chambers in thin layer chromatography are also disclosed.

An apparatus for detecting analytes in a liquid sample may include an elongated primary channel through which an ionic species flows, the primary channel extending through a primary channel member, a first regenerant channel through which a regenerant flows, the first regenerant channel extending adjacent to the primary channel and being formed in a first block, a first charged barrier having exchangeable ions capable of passing ions of only one charge, positive or negative, and of blocking bulk liquid flow, the first charged barrier disposed between the primary channel member and the first block for separating the primary channel from the first regenerant channel, and a first sealing member disposed between the first charged barrier and the first block defining the first regenerant channel.

An apparatus for detecting analytes in a liquid sample may include an elongated primary channel through which an ionic species flows, the primary channel extending through a primary channel member, a first regenerant channel through which a regenerant flows, the first regenerant channel extending adjacent to the primary channel and being formed in a first block, a first charged barrier having exchangeable ions capable of passing ions of only one charge, positive or negative, and of blocking bulk liquid flow, the first charged barrier disposed between the primary channel member and the first block for separating the primary channel from the first regenerant channel, and a first sealing member disposed between the first charged barrier and the first block defining the first regenerant channel.