MELIBIOSE Chemical Properties

Melting point:

182 °C (dec.) (lit.)

alpha 

+138 - +143° (D/20)(c=1, dil. NH4OH,18hr)(calculated on the dried basis)

Boiling point:

774.5±60.0 °C(Predicted)

Density 

1.68±0.1 g/cm3(Predicted)

storage temp. 

Sealed in dry,Room Temperature

solubility 

H2O: soluble0.1g/mL, clear, colorless

form 

Crystalline Powder

pka

12.45±0.20(Predicted)

color 

White

optical activity

[α]20/D +137±3°, 10 hr, c = 5% in H2O

Water Solubility 

Soluble in water at 100mg/ml

Merck 

5820

BRN 

93360

Stability:

Hygroscopic

LogP

-3.200 (est)

CAS DataBase Reference

585-99-9(CAS DataBase Reference)

EPA Substance Registry System

Melibiose (585-99-9)

Safety Information

WGK Germany 

3

TSCA 

Yes

HS Code 

29400090

MSDS

• Language:English Provider:SigmaAldrich

MELIBIOSE Usage And Synthesis

Chemical Properties

White powder

Uses

Melibiose has been used in a study to improve the preparation of benzoylated ethyl 1-thioglycosides. It has also been used in a study to investigate the effect of water plasticization on the molecular mobility and crystallization tendency of amorphous disaccharides.

Definition

A salt that has a single molecule of WATER OF CRYSTALLIZATION, such as sodium carbonate monohydrate, Na₂CO₃.H₂O.

Definition

monohydrate: A crystalline compoundhaving one mole of water permole of compound.

Definition

A disaccharide con- sisting of two glucose units in an alpha (1- 6)glycosidic linkage. It is an effector molecule that permits activation of the lac operon by binding to the repressor molecule.

General Description

Melibiose is a carbon substrate.

Purification Methods

Melibiose crystallises as a hydrate from water or aqueous EtOH. The anomer is obtained by recrystallising 1g from a mixture of 0.35mL of H2O and 0.2mL of EtOH. It crystallises easily with m 179o and mutarotates from [] D 20 +166o to +142.3o (220minutes, c 4, H2O). Crystallisation from MeOH gives the anhydrous form which hydrates to the monohydrate in air. The anomer dihydrate m 85-86o mutarotates from [] D 20 +123.5o to +143.1o (c 4, H2O for anhydrous). [Fletcher & Diehl J Am Chem Soc 74 5774 1952, Beilstein 1 7 III/IV 3075, 17/7 V 206.]

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