Patent ID: 7166212

Claim:
A multicapillary column, especially useful for liquid chromatography and sample preparation applications, comprising: (a) a plurality of capillary tubes contained within a column for receiving a sample at a first end of the column and discharging a separated sample at a second end of the column; (b) an insoluble stationary phase being coated directly on interior surfaces of said capillary tubes; said stationary phase coating comprising a thickness that is correlated with the radius of individual capillary tubes for achieving high efficiency capillary tubes by applying a greater amount of stationary phase on wider capillary tubes and a lesser amount of stationary phase on narrower capillary tubes to enhance uniformity of said capillary tubes; and wherein the insoluble stationary phase coating contains an organic group R, where R is an aliphatic, aromatic, organoelement, or ionogenic group.