Sucrose infrared absorption

Identification Identify Sucrose Acetate Isobutyrate by comparing its infrared absorption spectrum with a typical spectrum as shown in the section on Infrared Spectra, using the same test conditions as specified therein. 

DAHP synthetase, 251, 255 Dehydroquinase, 258 Dehydroshikimate riductase, 259 Dextrans, 341 acid hydrolysis of, 349 chain lengths of, 345, 346 cuprammonium complexes of, 355 electron microscope studies on, 349 enzymic synthesis of, 342, 345, 355 from sucrose, 342 flow birefringence studies on, 349 fructose-containing, 359 infrared absorption spectra of, 352 isolation of, 343... 

Optimum toxin production was found in a stirred, aerated culture medium consisting of potato infusion and sucrose after 3 to 5 days growth. The toxin was adsorbed on charcoal from the culture filtrate and eluted with chloroform. The red-brown residue remaining after evaporation showed little or no absorption in the carbonyl region of the infrared and only weak absorption in the ultraviolet. However, on mild treatment with acid, base, or heat two carbonyl peaks appeared at 1715 and 1685 cm.-1 in the infrared and at 266 mft in the ultraviolet (3). 

The density of sucrose is 1.5879 g/cm . The linear expansion coefficient ranges from 0.0028 to 0.0050 percent, depending on the axis. Characteristic infrared (IR) absorption bands occur at 1010, 990, 940, 920, 870, 850 cm (sharp), and at 680, 580 cm" (broad). The specific heat of crystalline sucrose is 415.98 J/mol at 20°C. The dipole moment is 2.8 x 10" cm (8.3D). Sucrose is readily soluble in water and the solubility increases with the rise in temperature. It is sparingly soluble in alcohol but moderately soluble in organic solvents, such as dimethyl formamide, p5nidine, and dimethyl sulfoxide. 

Davies, A.M.C. and Miller, C.E., Tentative assignment of the 1440-nm absorption band in the near-infrared spectrum of crystalline sucrose, Appl. Spectrosc., 42(4), 703-704, 1988. 

---