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Galactose is a monosaccharide. When combined with glucose (monosaccharide), through a condensation reaction, the result is the disaccharide lactose. The hydrolysis of lactose to glucose and galactose is catalyzed by the enzymes lactase and β-galactosidase. The latter is produced by the lac operon in Escherichia coli.
In nature, lactose is found primarily in milk and milk products. Consequently, various food products made with dairy-derived ingredients, e.g. breads and cereals, can contain lactose. Galactose metabolism, which converts galactose into glucose, is carried out by the three principal enzymes in a mechanism known as the Leloir pathway.
In the human body, glucose is changed into galactose via hexoneogenesis to enable the mammary glands to secrete lactose. However, most lactose in breast milk is synthesized from galactose taken up from the blood, and only 35±6% is made from galactose from de novo synthesis.
Assay: min. 98.0% (HPLC)
a20°C/D (10% in water): +78° - +81.5°
pH (10% in water): 5.0 - 7.0
Insoluble matter: corresponds
Water (K.F.): max. 0.3%
A (1cm/1M in water): at 260nm max. 0.05, at 280nm max. 0.05
Solubility (25°C): 680g/L (H2O)
MP = 167-170°C
Heavy metals (as Pb): max. 0.001%
MW = 180.16 g/mol.
Sicherheits Hinweise / Safety
Klassifizierungen / ClassificationEC-Nr: 200-416-4
Dokumente - Protokolle - Downloads
Here you will find information and further literature on D(+)-Galactose from lactose (min. 98.0% HPLC). For further documents (certificates with additional lot numbers, safety data sheets in other languages, further product information) please contact Genaxxon biosience at: firstname.lastname@example.org or phone: +49 731 3608 123.