Solvents dissolution

Lee, S.J. and McClements, D.J. (2010) Fabrication of protein-stabilized nanoemulsions using a combined homogenization and amphiphilic solvent dissolution/evaporation approach. Food Hydrocolloids, 24, 560-569. 

Szabolcs determined the active principle in preparations based on miconazole and clotrimazole [15]. The two drugs were determined in ointments by extraction with chloroform, evaporation of the solvent, dissolution of the residue in acetic acid, and titration with 0.1 N perchloric acid in the presence of Gentian Violet. 

A water-soluble analog of NHS-biotin containing a negatively charged sulfonate group on its NHS ring structure also is available. Sulfo-NHS-biotin may be added directly to aqueous reactions without the need for organic solvent dissolution. A concentrated stock solution may be prepared in water to facilitate the addition of a small quantity to a reaction, but hydrolysis of the NHS ester will occur at a rapid rate, so the solution must be used immediately. 

Food-control laboratories seeking to be accredited for the purposes of the Directive should include, as a minimum, the following techniques in generic protocols HPLC, GC, atomic absorption and/or ICP (and microscopy). A further protocol on sample preparation procedures (including digestion and solvent dissolution procedures) should also be developed. Other protocols for generic methods which are acceptable to UKAS may also be developed. Proximate analyses should be addressed as a series of specific methods including moisture, fat, protein and ash determinations. 

Air (phosgene) Phosgene collection in an impinger containing a solution of aniline (forming carbanilide) evaporation of solvent dissolution of residue in acetonitrile HPLC/UV (EPA Method T06) 0.1 ppb (v/v) 100 at 3 ppb (v/v) 15% RSD EPA 1988n... 

In conclusion, for low-dose dmg products, it is important to be aware of the possibility that adsorption of the dmg from the sample solutions onto surfaces can lead to low or variable assay results. These surfaces include filters, volumetric flasks, and sample vials. Evaluation of the components that come in direct contact with the sample solutions for potential dmg adsorption should be conducted as part of method development. This is especially true for compounds containing active sites such as amino groups, as described in this case study. While, most potency analyses involve the use of some organic solvents in the dissolving solvent, dissolution analyses could be problematic since the compendial media are aqueous buffers. For components such as HPLC vials, it is important to examine not only the type... 

Bis[triethylsilyl] tellurium or bisftriethylgermyl] tellurium were heated with trisfpenta fluorophenyl]bromostannane in toluene at 100° for two hours. Evaporation of the solvent, dissolution of the residue in petroleum ether, and chilling the solution to —10°, precipitated crystals of bis[tris(pentafluorophenyljstannyl] tellurium (m.p. 118°) in 51% yield4. 

Gold leaching, Acidified organic solvents. Dissolution rate, Non-aqueous leaching... 

Physical treatments include heating, centrifugation, high shear, ultrasonics, solvent dissolution, and the use of high-voltage electrostatic fields [46]. Other nonconventional methods, such as microwave demulsification [134] and the use of porous glass membranes [135], have also been investigated. 

Solubility soluble in water slightly soluble in ethanol (95%) insoluble in organic solvents. Dissolution requires dispersion (wetting) of the solid in water at room temperature followed by heating the mixture to about 90°C for approximately 5 minutes. Mixing should be continued while the heated solution is cooled to room temperature. Specific gravity ... 

The first step in analysing plastics for metals content in polymers by ICP-AES technique is that they must be prepared in solutions that are suitable for nebulization. There are four general methods applicable for sample preparation for metal analysis by ICP-AES and they are solvent dissolution of some plastics dry ashing using a muffle furnace acid digestion using a microwave oven and oxygen bomb combustion. 

A solvent dissolution, a vapor adsorption, any kind of surface-active substance exchange between the surface and the adjacent subphase, or heating makes the surface tension locally vary, thus generating Marangoni stresses and convection. Then, gravitocapillary waves (wavelength X and amplitude q) excited and sustained by the Marangoni effect in the shallow water waves approximation can be described by the equation ... 

In the simple experiment of the deposited nitroethane drop, we can observe several types of collisions. However, in view of the unsteady character (solvent dissolution, etc.) of this kind of experiment, the occurrence of a given type of interaction has a random character. However, we can safely say that each event depends on the local value of parameters such as the local Ma, and not on the initial conditions of the experiment. 

A typical sample preparation method for a solid dose is to add the sample or a triturated dose to a suitable solvent. Dissolution of the compounds of interest can be accelerated by stirring, shaking, or sonication. These methods allow the precise control of volume and temperature. Soxhlet extractors (see Section V.A) are designed for liquid-solid extraction, but are rarely used. 

A modified ampoule preparation vessel was used to study the effect of gaseous products trapped in the polymer. A side arm with glass break-seal was added through which a solvent was introduced after irradiation (1.0 Mrad) of the polymer. Chlorobenzene (—0.3 cm3) was used as the solvent since its chromatographic retention time was significantly longer than the retention times for the radiolysis products. After dissolution, the irradiated polymer, volatile products and solvent were sealed into an ampoule and analysed as outlined above. The addition of solvent, dissolution and ampoule preparation were all performed in a closed system, i.e., the irradiated sample was never exposed to air. 

Evaluation of Methodology. Several blank analyses were performed during the course of the investigation. These included system blanks, which involved extraction of empty thimbles and simulation of the entire analytical procedure as well as individual solvent blanks, which were evaporations of known volumes of solvent, dissolution in methylene chloride, and analysis using GC-MS in the SIM mode. The median blank concentration for an individual PAH was 0.2 ppb based on a sample size of 200 g. All PAH concentrations reported here have been corrected for the appropriate blank. 

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