Galactose lactose hydrolysis

Disaccharides, e.g., lactose, which yield galactose upon hydrolysis, will also give the sparingly-soluble mucic acid but in poorer 3deld. This reaction may be employed for the differentiation between certain disaccharides lactose — mucic + saccharic acids sucrose — saccharic acid only maltose — saccharic acid only. 

Galactose and also carbohydrates which yield galactose upon hydrolysis (e.g., lactose) are oxidised tothespaiingly solublemucic acid (compare Section 111,139). 

Lactose is a disaccharide that yields D-glucose and D-galactose on hydrolysis. It is designated as 4-0-/3-galactopyranosyl-D-glucopyranose... 

The rate of hydrolysis is dependent on the mineral, lactose, and galactose concentrations, as well as on the temperature and pH. Many kinetic studies are available on lactose hydrolysis systems and enzymes (MacBean 1979). Inhibition of hydrolysis can be caused by galactose or sodium and calcium ions, so demineralization is often necessary. 

The presence of galactose inhibits lactose hydrolysis by lactase. Glucose does not have this effect. 

Lactose.—Milk-sugar or lactose is found naturally, as its name indicates, in milk. It forms small white crystals which dissolve with some difficulty in water. Lactose, on hydrolysis, yields equivalent amounts of dextrose and galactose. After hydrolysis the dextrose and galactose can be fermented with the production of alcohol, and usually in practice, with some pro-... 

Acid hydrolysis of lactose (C12H22O11) gives equimolar quantities of D-glucose and D-galactose. Lactose undergoes a similar hydrolysis... 

The human organism hydrolyzes sucrose, lactose and oligosaccharides of the maltose and isomaltose type. The enzyme lactase, which is responsible for lactose hydrolysis, is lacking in some adults. Glucose and galactose are actively transported, while all other monosaccharides are transported only by diffusion. Sugar phospho-... 

Glucose and galactose are the products of lactose hydrolysis by the enzyme lactase. Some individuals are unable to metabolize lactose because of reduced lactase levels, a condition termed lactose intolerance. Preparations of the enzyme lactase are now being marketed for commercial or consumer addition to milk. The resulting milk is sweeter tasting because the majority of the lactose is hydrolyzed to glucose and galactose. 

Lactase Kluyveromyces fragilis Lactose hydrolysis to form glucose and galactose... 

Lactose on hydrolysis gives glucose and an isomeric monosaccharide galactose, which may be given the symbol Ga-r. The lactose molecule may be represented as Ga-r-G-r, and it has therefore also a free potential aldehyde group and is a reducing sugar like maltose. 

D (+) Galactose is a constituent of numerous polysaccharides It is best obtained by acid hydrolysis of lactose (milk sugar) a disaccharide of d glucose and d galactose L (—) Galactose also occurs naturally and can be prepared by hydrolysis of flaxseed gum and agar The principal source of d (+) mannose is hydrolysis of the polysaccharide of the ivory nut a large nut like seed obtained from a South American palm... 

D-Galactose Hydrolysis of lactose. Can be changed to glucose in the liver and metabolized. Synthesized in the mammary gland to make the lactose of milk. A constituent of glycolipids and glycoproteins. Failure to metabolize leads to galactosemia and cataract. 

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