Solubility mixtures

A water-soluble mixture may be in the form of a mixture of water-soluble solids or in the form of a liquid. The liquid mixtimes are frequently aqueous solutions. The prelirninary examination of a liquid mixture (see 1) will indicate whether a volatile solvent (i.e., removable on a boiling water bath) is present. If a volatile solvent is present, distil 20 g. of the mixtime from a water bath until no more hquid passes over set aside the volatile solvent for identification. Dissolve the residue (B) in water as detailed below for a mixture of solids. 

The above procedure for the separation of a water-soluble mixture is summarised in Table XI,9,2. 

TABLE XI,9,2. GENERAL SCHEME FOR SEPARATION OF A WATER-SOLUBLE MIXTURE... 

Sulfur and its compounds are among the oldest and most widely used pesticides. Elemental sulfur is especially effective as a dust for the control of mites attacking citms, cotton, and field crops and as a protectant against chiggers, Trombicula spp., attacking humans. Sulfur also is a valuable fungicidal diluent for other dust insecticides and is used in wettable form as a spray mixture. Time sulfur has been a standard dormant spray for the control of the San Jose Quadraspidiotuspemiciosus and for other scales and various plant diseases. Time sulfur is a water-soluble mixture of calcium pentasulfide,... 

Plant resins are lipid-soluble mixtures of volatile and nonvolatile terpenoid and/or phenolic secondary compounds that are usually secreted in specialized structures located either internally or on the surface of the plant. Although terpenoid resins constitute the majority of the resins produced and used, some other important resins are phenolic. Phenolic resin components, which occur on the surfaces of plant organs, have been used particularly in medicines [86]. 

There are also several water-soluble mixtures of polysaccharides, including those derived from seaweeds and marine animals, such as gum arabic, agar, algin, carrageenan, and chitin. These are hydrophilic. Their suspensions in water can be quite viscous and can readily form gels, and they can form viscous interfacial films around dispersed droplets and bubbles [821], They are used to stabilize suspensions, foams, and emulsions and are used in many different foods and medicines including, for example, ice cream [428,430], See also Ref. [822],... 

Libraries prepared by application of real combinatorial synthetic methods are usually submitted to screening experiments, either as soluble mixtures or as unknown discrete compounds cleaved from, or tethered to individual beads of the solid support. The task in deconvolution is to identify the substance that has a desired property. The deconvolution methods can be classified into two groups deconvolution of mixtures, cleaved from support and deconvolution of tethered libraries. 

Freeze drying, also known as lyophilization, is a process in which water is sublimated from the product after freezing. This process can be used in many different ways to achieve the same end point. In one of the freeze-drying formulation methods, drug is physically trapped in a water-soluble matrix (water-soluble mixture of saccharide and polymer, formulated to provide rapid dispersion, and physical strength), which is freeze dried to produce a product that dissolves rapidly when placed in the mouth. The ideal candidate for this kind of manufacturing method would be a molecule that is chemically stable and water insoluble, with a particle size lower than 50 In another method, lyophili-... 

R. Numrich, Falling Film Evaporation of Soluble Mixtures, in Convective Flow Boiling, J. C. Chen ed., pp. 335-338, Taylor Francis, Washington, DC, 1996. 

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