Glass vials

A laboratory capped glass vial with a F shaped iron wire attached to its inner side by plasticine, (see Fig. 7), was tomographed with 80 keV. 

Figure 7. Test object no. 2, capped glass vial with an iron wire on the inside.

A solvent free, fast and environmentally friendly near infrared-based methodology was developed for the determination and quality control of 11 pesticides in commercially available formulations. This methodology was based on the direct measurement of the diffuse reflectance spectra of solid samples inside glass vials and a multivariate calibration model to determine the active principle concentration in agrochemicals. The proposed PLS model was made using 11 known commercial and 22 doped samples (11 under and 11 over dosed) for calibration and 22 different formulations as the validation set. For Buprofezin, Chlorsulfuron, Cyromazine, Daminozide, Diuron and Iprodione determination, the information in the spectral range between 1618 and 2630 nm of the reflectance spectra was employed. On the other hand, for Bensulfuron, Fenoxycarb, Metalaxyl, Procymidone and Tricyclazole determination, the first order derivative spectra in the range between 1618 and 2630 nm was used. In both cases, a linear remove correction was applied. Mean accuracy errors between 0.5 and 3.1% were obtained for the validation set. 

Carefully fractionated through a gauze-packed column. Redistil and collect in weighed glass vials and seal. Keep away from moisture. It undergoes alkyl exchange with alcohols and forms azeotropes, e.g. with MeOH the azeotrope consists of 70% (MeO)3B and 30% MeOH with b 52-54"/atm, d 0.87. [J Chem Soc 2288 7952 Chem Ind (London) 53 7952 J Am Chem Soc 75 213 7955.] Also dried with Na, then distilled. 

FILTER OVEN DRIED AT 60 C AND STORED IN GLASS VIAL... 

Storage under vacuum in a sealed tube (Method II). Substances that are extremely oxygen-sensitive, such as the fluorescent compound F of euphausiids and dinoflagellate luciferin, have to be stored in an evacuated sealed container at a low temperature. For long-term storage, they must be fuse-sealed in an evacuated glass vial using the method outlined below. 

FIGURE 15-22 When a mixture of hydrofluoric acid and ammonium fluoride is swirled inside a glass vial (a i, reaction with the silica in the glass frosts the surface of the cover glass as well as the walls of the vial (b)... 

Fig. 11 Experimental set-up for small-scale microwave SPPS of /S-peptides (SPE = solid-phase extraction). 1 Pasteur pipet for N2 agitation 2 10 mL glass vial 3 4mL solid-phase extraction tube 4 DMF 5 coupling solution 6 resin 7 polyethylene frit 8 Luer-lock cap...

Another example of enzyme- and acid-catalyzed DKR has been reported by Bornscheuer [45]. Acyloins were racemized by using an acidic resin through the formation of enol intermediates. The enzymatic resolution was catalyzed by CALB. Since deactivation of this enzyme occurred in the presence of the acidic resin, they designed a simple reactor setup with two glass vials cormected via a pump to achieve a spatial separation between the acidic resin and the enzyme (Figure 4.20). 

Force the solution through the Alter cartridge into a clean glass vial with a TeAon-lined lid for storage. Just prior to analysis, this Altered extract is diluted 1 1 (v/v) with internal standard solution. The combination of exAact with internal standard solution may be made directly into the instrument autosampler vial. 

Prom the experimental point of view the static headspace sampling technique is very simple. The sample, either solid or liquid, is placed in a glass vial of appropriate size and closed with a Teflon-lined silicone septum. The 1 is carefully... 

Syntheses. Isotactic poly(methyl methacrylate) was synthesized by the method of Tsuruta et al. (9 ). Under a nitrogen atmosphere, a quantity of 6 mL (0.056 mole) of methyl methacrylate (MMA) dried over 4A molecular sieve was dissolved in 24 mL of similarly dried toluene. To the glass vial containing the reaction was added 0.65 mL of 1.6 M n-butyllithium, and the reaction was kept at -78°C in a dry ice/isopropanol bath. The polymerization was halted 24 hr later with the addition of hydrochloric acid and methanol (methanol/water 4.1 by volume). The polymer was dried in vacuo at 50°C, redissolved in methylene chloride, precipitated by being poured into water-containing methanol, and dried in vacuo at 50°C. Tacticlty and composition were verified with % NMR. Yield 47%. 

Figure 5 Temperature profile in primary drying of dobutamine HCl-mannitol (1 1), 53 mg solids/mL, 10 mL fill volume. Vials are 5304 molded glass vials (8.3 cm2 cross-sectional area) which are placed in a flat aluminum tray. The heat flux is 42 cal/(cm2 hr), and the chamber pressure is 0.1 torr. (From Ref. 5.)...

Figure 33 Comparison of heat transfer mechanisms for glass vials on a polished stainless steel shelf. Pressure is in millitorr. The vial identification numbers are manufacturers designations. (From Ref. 1.)...

PDMS thimble contained in glass vial. The substrate, an acetal, is within the PD MS thimble and undergoes an acid-catalyzed transformation into an aldehyde. The aldehyde then diffuses to the exterior and undergoes the Baylis—Hillman reaction catalyzed by DMAP to give the product, (b) Various acid and base... 

It ignites immediately in air or oxygen [1], A simple device to open glass vials of caesium and dispense the contents safely gives a good margin of safety to the user [2],... 

The contents of the flask are then poured upon 600 g. of cracked ice, and, with hand stirring, 75 ml. of hydrochloric acid (sp. gr. 1.18) is added. The cold mixture is now filtered through glass wool in an ordinary funnel into a 2-1. separatory funnel. The aqueous layer is separated and extracted once with 250 ml. of ether (Note 7). The combined extract and main product are dried over 30 g. of calcium chloride, the ether is removed on a steam bath, and the residue is distilled using a 500-ml. modified Claisen flask.6 The selenophenol is collected at 57-59°/8 mm. or 84-86°/25 mm. the yield is 43-54 g. (57-71%) (Notes 6 and 9 through 14). The product should be sealed at once in a glass vial (Note 8). 

Remove the aqueous phase and transfer the organic phase into a clean glass vial or tube. 

MedChem Kit (Fig. 3.5) An accessory especially designed for medicinal chemistry laboratories to cover working volumes of 2-140 mL. The package contains a 12 mL glass vial, a 50 mL quartz vessel, and single-pressure reactor segments (100 mL and 270 mL, respectively). 

CombiCHEM System (Fig. 3.9) For small-scale combinatorial chemistry applications, this barrel-type rotor is available. It can hold two 24- to 96-well microtiter plates utilizing glass vials (0.5-4 mL) at up to 4 bar at 150 °C. The plates are made of Weflon (graphite-doped Teflon) to ensure uniform heating and are sealed by an inert membrane sheet. Axial rotation of the rotor tumbles the microwell plates to admix the individual samples. Temperature measurement is achieved by means of a fiber-optic probe immersed in the center of the rotor. 

---