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• W317070497 abstract "Recently, the monolith columns have raised a lot of interest in liquid chromatography. The whole stationary phase of the monolith column is one body with numerous multiple porous channels, thus it does not need any frit since the whole stationary phase functions as a frit. A monolith column is prepared by in situ polymerization or condensation of organic or inorganic monomers inside the column tubing and, if necessary, the surface is functionalized. We reported a disposable microcolumn that enabled removing the need of sample pretreatment in a previous study. We disposed of the stationary phase after using the column for a day or so and repacked the column with fresh stationary phase. We were unable to suggest a feasible frit technique but a rather tedious one at that time. The technique of making fixed frits in the column main body tubing is generally used in production of microcolumns, especially microcolumns made of silica capillary. The recent trend of silica capillary microcolumns is shifting swiftly toward monolithic columns. Details of monolith columns have been introduced in some review articles, and patents of various monolith columns have appeared. A method of preparing fixed frits at both ends of the column by partial heat treatment of packed silica capillary was introduced in the literature, and a research group packed a silica capillary with porous silica and sintered the stationary phase by heating, leaving the whole stationary phase combined but the porous spherical structures of the powders unchanged. A peculiar monolith column was prepared by putting the dispersed solution of stationary phase powders, water, a solvent such as alcohols, and a metal alkoxide in silica capillary, and by applying heat and vacuum. Study on formation of monoliths in stainless steel tubing is scarce in the literature. There was once a report on formation of organic monolith in LC/MS spray tube of 0.1 mm ID, however there has been no report on formation of silica monoliths in a metal tube. The commercially available silica monolith rod is produced in a mold and sold only in the form encased in shrinkable poly(ethyl ether ketone) and equipped with column end fittings. The Merck Chromolith columns released to the market in 2000 have been extensively applied in various fields, including analysis of drugs and metabolites, analysis of environmentally relevant substances, food additives, chiral separations, as well as bioanalytical separations. The ID of this column is 4.6 mm. The advantage of fast analysis of this monolith column is due to high eluent flow rate enabled by much lower column back pressure compared to conventional columns. Increased consumption of mobile phase, however, is a problem of this column. Decrease of mobile phase consumption can only be enabled by decrease of column diameter. Production of silica monolith rod of small ID clad in poly(ethyl ether ketone) is known to suffer from technical problems. This study has been carried out in expectation of developing stainless steel silica monolith microcolumns of 0.5 mm ID" @default.
• W317070497 created "2016-06-24" @default.
• W317070497 date "2004-10-20" @default.
• W317070497 modified "2023-10-16" @default.
• W317070497 title "C18 Attached Silica Monolith Microcolumns Made in Stainless Steel Tubing and Their Application in Analysis of Flavonoids in Green Tea Extracts" @default.
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• W317070497 doi "https://doi.org/10.5012/bkcs.2004.25.10.1589" @default.
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