Acetone insolubles

The US. Pharmacopeia (USP XXII) or National Formula (NFXVII) (20) also provide a similar description however, the peroxide value is not defined (Table 9). These specifications are also given in the Handbook of Pharmaceutical Excipients (HPE), pubhshed jointiy by the American Pharmaceutical Association and The Pharmaceutical Society of Great Britain (21), which defines lecithins both from plants and eggs. The Merck Index (22) specifies a slightiy lower acid value. The Japanese Monograph (ISCI-II) (23) specifies a slightiy lower acetone-insoluble matter and a lower heavy-metal content. 

The standard methods (26) of analysis for commercial lecithin, as embodied in the Official and Tentative Methods of the American Oil Chemists Society (AOCS), generally are used in the technical evaluation of lecithin (27). Eor example, the AOCS Ja 4-46 method determines the acetone-insoluble matter under the conditions of the test, free from sand, meal, and other petroleum ether-insoluble material. The phosphoHpids are included in the acetone-insoluble fraction. The substances insoluble in hexane are determined by method AOCS Ja 3-87. 

The quantitative analysis procedure involves gravimetric detn of the HMX on a moisture-free basis after benzene extraction of, and differential detn of TNT. Moisture content is detd by conductometric titration of sample in an acetic-sulfuric acid suspension. Acetone insoluble matter is determined gravimetrically... 

Melting Point. The melting point of PETN shall be 141 degrees Centigrade (°C) plus or minus 1.0 °C Nitrogen Content. The nitrogen content of PETN shall be 17.50 percent minimum (min) Acetone insoluble material The acetone insoluble material of PETN shall be 0.10 percent maximum... 

Reaction of K3Co(CN) with PMMA. A 1.0 g sample of PMMA and 1.0g of the cobalt compound were combined in a standard vessel and pyrolyzed for 2 hrs at 375°C. The tube was removed from the oven and the contents of the tube were observed to be solid (PMMA is liquid at this temperature). The tube was reattached to the vacuum line via the break-seal and opened. Gases were determined by pressure-volume-temperature measurements on the vacuum line and identified by infrared spectroscopy. Recovered were 0.22g of methyl methacrylate and 0.11 g of CO and C02. The tube was then removed from the vacuum line and acetone was added. Filtration gave two fractions, 1.27g of acetone insoluble material and 0.30g of acetone soluble (some soluble material is always lost in the recovery process). The acetone insoluble fraction was then slurried with water, 0.11 g of material was insoluble in water. Infrared analysis of this insoluble material show both C-H and C-0 vibrations and are classified as char based upon infrared spectroscopy. Reactions were also performed at lower temperature, even at 260°C some char is evident in the insoluble fraction. 

Leafy Spurge Wax. Leaves of four North American accessions and one European accession of Euphorbia esula were dipped in chloroform (30 sec.) to obtain leaf wax samples for analytical gas chromato-graphy/mass spectrometry (GC/MS) analysis (28). The wax samples were partitioned into acetone soluble and acetone-insoluble fractions. 

The GC/MS analysis showed the acetone-insoluble portion to contain hydrocarbons, long-chain aldehydes and alcohols, fatty acids and fatty acid esters while the acetone soluble portion contained terpenes and terpene esters. The yields of the general chemical classes as determined in the analysis of the five samples are summarized in Table III. A high yield of long-chain alcohols (primarily 1-hexacosanol) is found in all the accessions. While the yields are generally comparable in the North American samples, a significantly... 

METHYLENE CHLORIDE- OR CHLOROFORM-SOLUBLE Q 80% METHANOL- OR 70% ACETONE-INSOLUBLE ... 

The crystallization of the acetone-insoluble polystyrene is completed by boiling for 2 h in freshly distilled butanone it is then allowed to stand overnight at room temperature and finally filtered and dried in vacuum at 60 °C. Yield of crystalline isotactic polystyrene 95-100% of the acetone insoluble portion.The crystalline melting range and the density see Sect. 2.3.4.1) are determined, as is also the limiting viscosity number in toluene at 20 °C. 

Lustrous triclinic crystals acid taste hygroscopic density 2.83 g/cm decomposes at 75°C reacts slowly with water soluble in acids and acetone insoluble in alcohol... 

The dihydrate exists as greenish blue orthorhombic crystals density 2.51 g/cm3 decomposes at 100°C is very soluble in water and ethanol (solubility greater than anhydrous salt in these solvents) also soluble in acetone insoluble in ether. 

Colorless tetragonal crystals faint violet luminescence refractive index 1.378 density 3.148 g/cm Moh s hardness 6 melts at 1261°C vaporizes at 2,260°C practically insoluble in water (76 mg/L at 18°C) soluble in nitric acid slightly soluble in dilute acids and acetone insoluble in ethanol. 

Anhydrous salt is a colorless, cubic, crystalline solid refractive index 1.650 density 3.052 g/cm melts at 875°C vaporizes at 1,250°C very slightly soluble in absolute alcohol and acetone insoluble in liquid ammonia. 

Acetone Insoluble Test is one of the standard tests for detg the purity of expls and propellants. It is conducted by dissolving a weighed amt of sample(W) in-measured vol-of acet at RT and filtering the soln through a rated sintered glass crucible(W,). After... 

It is sparingly soluble in alcohol and acetone, insoluble in ether, chloroform and carbon disulphide.8 Alkalis and ammonia in aqueous solution readily dissolve it. It is also soluble in a solution of hydriodie acid. 

Acetone Insoluble, ethyl-ether soluble Ethyl-ether insoluble ... 

Yield.—80% theoretical (275 gms. from 300 gms. of glycerol). Strongly acid syrup, faintly yellow colour soluble in water, alcohol and acetone insoluble in ether decomposes on boiling. (A., 106, 79, 95 120, 226 B 9, 1902.)... 

An example of the difference of the solvent extracts from the bulk material comes from a series of studies on the exhaustive extraction of coal by boiling pyridine and fractionation of the regenerated soluble solids by sequential selective extraction schemes (Berkowitz, 1979). Subsequent analyses showed that the petroleum ether-soluble material was mostly composed of hydrocarbons (e.g., paraffins, naphthenes, and terpenes), while the ether-soluble, acetone-soluble, and acetone-insoluble fractions were resinlike substances with 80 to 89% carbon and 8 to 10% hydrogen. Indeed, this and later work (Vahrman, 1970) led to the concept that coal is a two-component or two-phase system (Derbyshire et al., 1991 Yun et al., 1991). 

Freely soluble in water (1 gm 5 ml), slightly soluble in alcohol (1 gm 100 ml), soluble in propylene glycol sparingly soluble in acetone insoluble in ether and in chloroform. 

One part dissolves in about six parts water at 0°C, and in about two parts at 80°C. Sparingly soluble in alcohol slightly soluble in acetone insoluble in ether.1... 

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