GENTIOBIOSE manufacturers and suppliers in india

GENTIOBIOSE

Properties

Melting point:: 195-197 °C (dec.)

Boiling point:: 397.76°C (rough estimate)

Density: 1.4149 (rough estimate)

refractive index: 9.5 ° (C=4, H2O)

storage temp.: Sealed in dry,2-8°C

solubility: Water (Sparingly)

pka: 12.45±0.20(Predicted)

form: Powder

color: White to Off-white

Water Solubility: Slightly soluble in water.

Merck: 14,4396

BRN: 93354

Safety Information

Symbol(GHS): GHS07

Signal word: Warning

Hazard statements: H315-H319-H335

Precautionary statements: P261-P271-P280

WGK Germany: 3

F: 3-10

HS Code: 29400090

Use

-Gentiobiose is best purified via the octaacetate which is recrystallised from MeOH, EtOH or better from methyl cellosolve by heating at 80o. The octaacetate (15g) is hydrolysed by suspending it in dry 0.05N NaOMe in MeOH (180mL) for 1hour with occasional shaking at room temperature. Dilute this with H2O to dissolve suspended matter, pass through Amberlite IR-120 and Duolite A-4 columns and the eluate is evaporated under reduced pressure to a syrup. Residual H2O is removed by repeated distillation with absolute EtOH under reduced pressure. The syrup is dissolved in methyl cellosolve (~40mL), filtered, nucleated and placed in an oven at 80o. The crystals are filtered off, washed with absolute EtOH (yield 6.7g, 89%), dried and have m 187-189o. Further recrystallisation from methyl cellosolve gives m 190o, and mutarotates from [] D 28 -1.5o (initial) to +10.6o (final, c 4, H2O). The -octaacetate has m 193o (crystallised from 95% EtOH) and has [] D 20 -5o (c 1.8, CHCl3). [Goldstein & Whelan Methods in Carbohydrate Chemistry I 313 1962, Academic Press, Beilstein 17/7 V 203.]