Extracts, extractive matter

Oil Expressed as oil or chloroform extractable matter, ppmw Scale, sludge and foaming in boilers impedes heat exchange undesirable In most processes Baffle separators, strainers, coagulation and filtration, diatomaceous earth filtration... 

For preparing lakes, a solution of aluminium sulfate (or chloride) is mixed with sodium carbonate, forming fresh alumina Al(OH)3. The colorant is then added and adsorbed on the surface of alumina. Usually the content of colorant in the lake ranges from 10 to 40%." The product is filtered, washed with water, dried, and milled. The product is allowed to contain unreacted alumina but must not contain more than 0.5% HCl-insoluble matter and not more than 0.2 % ether-extractable matter. - Lakes are insoluble in most solvents used for pure dyes, and they have high opacity and better stability to light and heat. Lakes impart their color by dispersion of solid particles in the food. The coloring properties of lakes depend on particles, crystal structures, concentrations of dye, etc. 

Figure 3.2 The three-step Soxhlet extraction process of the Soxtec extraction system (a) solubilisation of extractable matter from sample immersed in boiling solvent (b) rinsing of extracted solid and (c) concentration of extracted sample and collection of distilled solvent for reuse or disposal. Reproduced by permission of FOSS Analytical A/S, Hillerdd...

How many stages are required for a 98 per cent extraction of a material containing 18 per cent of extractable matter of density 2700 kg/m3 and which requires 200 volumes of liquid/100 volumes of solid for it to be capable of being pumped to the next stage The strong solution is to have a concentration of 100 kg/m3. 

Extractable matter should be removed by extraction with organic solvents, e.g., xylene. This is especially important for carbon blacks (25), Oxidized carbon may contain small amounts of oxalic acid. King (33, 34) found 0.002 meq/gm of oxalic acid in oxygen-treated sugar charcoal. More severe is the contamination of the surface with adsorbed gases, mainly carbon dioxide and water. Activated carbon with narrow pores may contain considerable amounts of carbon dioxide (28). The best... 

Note For solvent extractive matter determination, grind the slices as prescribed for small grains (par. 4.2). ]... 

When the solvent is boiled, the vapour passes through opening D to the condenser, from which liquid drops back to the thimble. When this liquid reaches the top of the side tube E, it automatically syphons back into the flask B with the extracted matter in solution. The process is continuous. 

If the spirit contains small quantities of extractive matters, the following method may also be used 100 c.c. of the spirit are treated in a flask holding about 400 c.c. with 2 c.c. of Fischer s reagent and shaken 200 c.c. of water are then added and after 2 hours the liquid is filtered, the precipitate being treated as described above. 

Fatty Substances and Free Sulphur.—The fats are determined as with tanned leather, carbon disulphide free from sulphur being used for the extraction. If the leather contains free sulphur, this occurs with the fat thus extracted. In such case, when the extracted matter is weighed, it is carefully oxidised in a platinum dish with fuming nitric acid to complete solution the acid is then evaporated off on a water-bath, the residue neutralised with concentrated sodium carbonate solution, the liquid taken to dryness and the residue ignited. This residue is dissolved, in water, the solution acidified with hydrochloric acid, the oxidation completed by boiling with a little bromine water, and the sulphate precipitated with barium chloride. The amount of sulphur corresponding with the... 

Tincture The alcoholic solution of extractable matter from suitable material, prepared by maceration. 

Ether-extractable matter <0.2% under neutral conditions Accessory colorings < 1.0%... 

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