Deactivated glass

Many forms of chromatography have been used to separate mixtures of quinoline and isoquinoline homologues. For example, alumina saturated with cobalt chloride, reversed-phase Hquid chromatography, and capillary gas chromatography (gc) with deactivated glass columns have all been employed (38,39). 

Round, flint glass with polymer-lined lids, 120-mL Square, flint glass with polymer-lined lids, 0.5-oz Filter cartridges, Acrodisc nylon, 25-mm (Gelman Sciences, Ann Arbor, MI, USA) or equivalent Filter, GF/A, 9-cm Florisil, 2.5% deactivated Glass wool... 

Perpentylated cyclodextrins are liquids even below room temperature. Cyclodextrin derivatives (Lipodex-stationary phases, Table 2) have been used in undiluted form for the separation of enantiomers of many classes of compounds on deactivated glass capillary columns169 176 (Figures 18 and 19). 

Trap desorption. The choice of the thermal desorption apparatus is critical in order to avoid contamination and to be able to work with aroma compounds in a wide range of retention indices. In all systems, problems can be encountered due to reactive compounds or cold spots within the analyzer. It is recommended that all transfer lines, valves, or surfaces in contact with the volatile compounds be made of an inert material such as fused-silica or deactivated glass-lined stainless steel. Even more ideal are systems that do not have long... 

Murphy B. 2004. Glass or deactivated glass vials Factors to be considered when choosing the proper vial for the application. Lab. Equip. C-17. 

Initial attempts to use cyclodextrins and their derivatives as chiral stationary phases in gas chromatography met with limited success owing to their unfavorable melting points or decomposition temperatures [28,30,33-36]. This changed with the discovery that some peralklylated derivatives (e.g. pentyl), partially alkylated derivatives, and mixed alkylated and acylated derivatives were viscous liquids that could be coated on deactivated glass surfaces. Table 10.4 [68-73]. In the absence of oxygen contamination of the... 

Laboratory experiments of the oxidation of hydrocarbons under NOx free conditions were made in 2 L and 10 L deactivated glass vessels by the photolysis of H2O2. 

Split injection is the oldest, simplest, and easiest injection technique to use. The procedure involves injecting 1 /xL of the sample by a standard syringe into a heated injection port that contains a deactivated glass liner. The sample is rapidly vaporized, and only a fraction, usually 1-2%, of the vapor enters the column (see Fig. 6.8). The rest of the vaporized sample and a large flow of carrier gas passes out through a split or purge valve. 

The trap consists of a stainless steel tube (it may be a deactived glass tube) length and i.d. of which vary from 5 to 25 cm and from 2 to 5 mm, respectively, filled with a packed column of sorbents (Figure 23.2). Different traps are commercially available with different fillings each one designed for a set analytes. For example, if dichlorodifluor-omethane (boiling point —29°C) has to be analyzed, the trap should contain charcoal or a similar sorbent. Table 23.5 summarizes the sorbent contained in different traps that are commercially available. 

FIGURE 9.13 Schematic Diagram of PTV Inlet. The inlet liner is packed with deactivated glass wool or other inert packing material to hold the liquid sample during vaporization. 

EXP-51 Trlmthyletboxy Silane is an intermediate useful for blocking hydroxyl or amino groups to perform reactions on multi-functional orgeuiic compounds or polymers. It is also useful for deactivating glass surfaces used in gas chromatographic applications. 

Inlet liner 4 mm ID deactivated glass liner with a 1 cm glass wool plug 3 cm from top... 

The simplest means to cover the tissue section by the matrix is to deposit a single drop of matrix solution on the surface. However, because of the risk of molecule delocalization and inhomogeneity, other techniques have been proposed. One approach makes use of a deactivated glass spray nebulizer. The matrix solution is placed in a reservoir and... 

A2.1 There are many possible pathways to deactivate glass surfaces. These are basically divided into vapor and liquid methods. Two examples follow ... 

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