Glycerins

Moisture controllers attract water. Sometimes they work so well that they actually pull water from the air. The liquid center of chocolate-covered cherries can be created by adding glycerin to the fondant that is molded around the cherry before it is dipped in chocolate. Over time, the glycerin absorbs so much water from the cherry that the fondant dissolves, making a liquid syrup inside the chocolate shell. 

Sample preparation Mix 1 mL plasma with 2 mL 10% trichloroacetic acid, centrifuge at 2500 rpm for 20 min. Wash the clear supernatant several times with ether until the aqueous layer becomes neutral. Dry the aqueous layer under a stream of air, reconstitute with 50 (xL water containing 5 [ig ethylene glycol, inject a 25 p,L aliquot. 

Mobile phase Gradient. MeCNiwater 76 24 for 30 min, to 0 100 (time not specified) 

Detector F ex 412 em 475 following post-column reaction. The column effluent mixed with 25 mM periodic acid pumped at 0.1 mT min and the resulting mixture flowed through an 0.4 mm ID reaction coil at 145° for 3 min. The effluent from this coU mixed with 8% acetylacetone in 2 M ammonium acetate (allowed to stand overnight before use) pumped at 0.2 mL/min and the mixture flowed through a similar coU at 64° to the detector. 

Extracted anhydroglucitol (29), dexteros (43), erythritol (32), ethylene glycol (20) 

Akanuma, H. Ogawa, K. Lee, Y. Aksinuma, Y. Reduced levels of plasma 1,5-anhydroglucitol in diabetic patients, J.Biochem.(Tokyo), 1981, 90, 157-162. 

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C3H6O4, HO OCHCOHj-CH OH. An un-crystallizable syrup it occurs in optically active forms. Prepared by oxidation of glycerin with nitric acid. 

Commercially glycerin is obtained as a byproduct in the manufacture of soap, and by various synthetic routes. Crude glycerin is purified by distillation. The various synthetic routes start with propenc. One proceeds via... 

Glycerol ct-dichlorohydrin, sym-dichloroiso-propyl alcohol, 1,3-dichloro-2-hydroxypropane, CH2CI-CHOH-CH2C1. Colourless liquid with an ethereal odour b.p. 174-175" C. Prepared by passing dry HCl into glycerin containing 2% elhanoic acid at 100-1 lO C. Converted to x-epichlorohydrin by K.OH, Used as a solvent for cellulose nitrate and resins. 

The base lubricant is usually a petroleum oil while the thickener usually consists of a soap or soap mixture. In addition they may contain small amounts of free alkali, free fatty acid, glycerine, anti-oxidant, extreme-pressure agent, graphite or molybdenum disulphide. 

When heated with sulphuric acid the acid is decomposed to CO, CO2 and H2O. Gives methanoic acid when heated with glycerin. Forms both acid and neutral salts. The normal... 

CH2 CH CH0. a colourless, volatile liquid, with characteristic odour. The vapour is poisonous, and intensely irritating to eyes and nose b.p. 53"C. It is prepared by the distillation of a mixture of glycerin, potassium sulphate and potassium hydrogen sulphate. It is manufactured by direct oxidation of propene or cross-condensation of ethanal with meth-anal. 

In order to provide the necessary coupling fluid the grip of the probe holder contains a small tank with a mixture of glycerine and water. Thus the operator is able to provide some drops of the liquid to every blade to be inspected. 

When boring rubber stoppers, lubricate the borer well, either with aqueous glycerine or with vaseline. Then clean well and dry before using. 

To bore a cork, a borer should be selected which gives a hole only very shghtly smaller than that desired. The cork borer is moistened with water or alcohol or best with glycerine it is convenient to keep a small bottle (ca. 25 ml. capacity) containing glycerine. Fig. 

CAUTION. Bromine must be handled with great care and in the fume cupboard. The liquid produces painful bums and the vapour is unpleasant. Bromine bums should be treated immediately with a liberal quantity of glycerine. If the vapour is inhaled, relief may be obtained by soaking a handkerchief in alcohol and holding it near the nose. 

Fit a 1-litre three-necked flask with two double surface condensers and a glycerine-scaled stirrer (Fig. II, 7, 10). Place 25 g. (29 ml.) of mesityl oxide (Section 111,79), 50 ml. of dioxan and a cold (10°) solution... 

Phenol should not be allowed to come into contact with the skin for it causes painful burns. The best antidote for phenol burns is a saturated solution of bromine in glycerine if all undi.ssolved bromine is allowed to settle out before the solution is used, there is no danger of bromine burns. Lime water may also be employed. 

Bromine on the skin. Wash the aflected part immediately with a liberal supply of light petroleum, b.p. 80-100°, and then rub glycerine well into the skin. After a little time remove the superficial glycerine and apply acriflavine jelly or butesin picrate ointment. 

Dimethoxyisoquinoline-1 -carboxylic acid 9.5 to 11.0 Yellow to blue 0.1% in glycerine/ ethanol/water in... 

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