Superoxes, high temperature universal phases in (GC)²

Gas chromatographic retention characteristics of phenols with Superox-20M

“…Superox-20M separates all the ortho, meta, and para alkylated phenolic isomers investigated, with the order of elution being ortho, para, meta. According to Verzele and Sandra, Superox-20M is a polyethylene glycol) or polyoxiran (22,23), of average molecular weight 20000, and differs from Carbowax-20M in that all traces of the polymerization catalyst have been removed. The retention characteristics of a few alkylated phenolic compounds have been investigated by others with Carbowax-20M using both packed columns and capillaries (32,33) and their findings indicate that Carbowax-20M does not separate meta and para alkylphenolic positional isomers.…”

High temperature silylation of glass capillary columns

“…Naphthalene (N) was added to the mixture as Grob mentions selective adsorption of aromatic compounds [8]. This effect of HTS surfaces was not observed even not for polyaromatics chromatographed at elevated temperatures [19]. (Fig.4), although this is particularly difficult.…”

“…[18] and the gum polyhydrocarbon RSL-110 [19]. All phases wet the column wall but for Superox-4 and RSL-110 the Maximum Allowable Operating Temperature or the MAOT value is lower than in other columns because of droplet formation (200' instead of 3OOOC).…”

Current aspects of the stationary phase in gas chromatography

“…This phase, Apolane 87, is available from Applied Science Labs. Sandra et al [165] found it difficult to coat silanized glass capillaries with this phase, although good results were achieved when a glass surface treated with Silanox 101 was coated with Apolane 87 [166]. The temperature limit on silanized whisker surfaces was 26OOC [I 671.…”