galactose


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Related to galactose: saccharose

galactose:

see lactoselactose
or milk sugar,
white crystalline disaccharide (see carbohydrate). It has the same empirical formula (C12H22O11) as sucrose (cane sugar) and maltose but differs from both in structure (see isomer).
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Galactose

A monosaccharide and a constituent of oligosaccharides, notably lactose, melibiose, raffinose, and stachyose. It is also known as d -galactose and cerebrose (see illustration). Agar, gum arabic, mesquite gum, larch arabo galactan, and a variety of other gums and mucilages contain d -galactose. See Agar, Monosaccharide

Structural formula for α - d -galactoseenlarge picture
Structural formula for α - d -galactose

l -Galactose (enantiomorph of d -galactose) occurs in several polysaccharides, including agar, flaxseed mucilage, snail galactogen, and chagual gum. Since d -galactose is usually also present, hydrolysis of these polysaccharides produces dl -galactose. See Carbohydrate

Galactose

 

a monosaccharide; one of the most frequently encountered natural hexahydric alcohols, a hexose. It differs from glucose in the spatial position of the groups around the fourth carbon atom. Galactose is readily soluble in water and only slightly soluble in alcohol. It exists in aliphatic and cyclic (pyranose, or furanose) forms, which are in a state of tautomeric equilibrium:

In plant tissues galactose is a component of raffinose, melibiose, and stachyose, as well as polysaccharides — galactans, pectins, saponins, various gums and mucilages, gum arabic, and so on. In the animal and human body galactose is a component of lactose (milk sugar), galactogen, group-specific polysaccharides, cerebrosides, and muco-proteins. Galactose is part of many bacterial polysaccharides and can be fermented by so-called lactose yeast. In animal and plant tissues, galactose readily changes to glucose, which is more assimilated and can be converted to ascorbic and galacturonic acids.

L. L. KHACHATRIAN

galactose

[gə′lak‚tōs]
(biochemistry)
C6H12O6 A monosaccharide occurring in both levo and dextro forms as a constituent of plant and animal oligosaccharides (lactose and raffinose) and polysaccharides (agar and pectin). Also known as cerebrose.
References in periodicals archive ?
As shown in Figure 4, the complete digestion of lactose occurs within the small intestine, as neutral lactase immediately releases its glucose and galactose components for rapid absorption.
6 [degrees]C at all studied substrate concentrations for both glucose and galactose oxidases.
2+] as catalyst in the reaction of galactose,but not in glucose with hexacyannoferrate(III) as oxidant table 5a.
Without proper levels of these proteins, these people are unable to process the sugar, galactose, which makes up about half of the calories in milk.
Subsequent to the recognition of GALT deficiency, 2 additional enzymatic defects of galactose metabolism that also caused galactose accumulation were identified.
Five years ago, Cramer linked galactose consumption with increased risk of ovarian cancer (SN: 7/22/89, p.
Lack of the enzyme galactose-1-phosphate uridyltransferase causes an increased amount of galactose in the circulating blood (known as galactosemia).
DAVANAT([R]), the Company's lead drug candidate, is a carbohydrate polymer, composed of mannose and galactose (galactomannan).
Galactosemia is an autosomal recessive disorder caused by an accumulation of unmetabolized galactose and its derivatives (galactose-1-phosphate and galactitol).
The scientists cultured skin cells in two different nutrient environments - glucose, which provides energy through both glycolysis and respiration, or galactose, which forces cells to rely on mitochondrial respiration alone.
Similar to Bayer's CONTOUR meter, BREEZE2 meters feature No Coding(TM) technology and no interference from maltose and galactose, making diabetes management easier.