Disaccharides, Biology

Assignment Help:

DISACCHARIDES

  • They are oligosaccharides composed of two monosaccharide residues .
  • Three common disaccharides are   sucrose (glucose + fructose) = cane suger maltose (glucose + glucose) = malt sugar lactose (glucose + galactose) = milk sugar
  • Common formula is Cn(H2O)n-1.

SUCROSE

  • Commercial or Table sugar.
  • Obtained from stems of Sugarcane (Saccharum officinarum) and roots of Beet sugar (Beta vulgaris).
  • Sucrose is a non-reducing sugar.
  • Sweetness index of sucrose is 100.
  • Formed of two molecules each of glucose and fructose.
  • It has neither aldehyde group nor keto group.

MALTOSE

  • Malt Sugar
  • It is a disaccharide formed of two molecules of glucose which are connected to each other through the a -1, 4 D-glycosidic linkage.
  • It is present in Barley.
  • Maltose is formed during hydrolysis of starch.
  • It is found in germinating cereals.
  • The sugar is present in malt, and is therefore, also called malt sugar.
  • Sweetness index is 30.
  • Maltose is a reducing surgar.

LACTOSE

  • Milk Sugar.
  • It is a disaccharide sugar present in milk upto the extent of 5%.
  • Lactose is formed of D-galactose and D-glucose, both in pyranose state, through the b-1, 4 glycocydic bond.
  • The monosaccharide galactose is also synthesised from glucose inside the mammary glands.
  • Sweetness index of lactose is 16.
  • Like maltose, lactose is a reducing sugar.
  • Souring of milk occurs when bacteria convert lactose into lactic acid.
  • Present only in mammals.

TREHALOSE

  • It is a disaccharide sugar made of two glucose residues which was originally obtained from cocoon of Trehela (weevil Larinus species) as sweetening agent.
  • Trehalose is found in haemolymph of some insects and fungi including yeast.

Related Discussions:- Disaccharides

Invertabrate zoology, a report on similarities and diffrences between proto...

a report on similarities and diffrences between protozoans and mesazoans

Define ecosystems science and large-scale ecology, Define Ecosystems scienc...

Define Ecosystems science and large-scale ecology? Many of today's most pressing problems are regional or global in nature including for instance, the effects of land cover and

Cerebellum, why cerebellum more developed in mammals that jump or fly?

why cerebellum more developed in mammals that jump or fly?

What are the results of chrchronic pulmonary thromboembolism, What are the ...

What are the Results of Chronic Pulmonary Thromboembolism? Results :  The reported mortality is between 5 and 24 per cent. On follow-up, the six-year survival in the best ce

Explain disorders of the gastrointestinal tract, Q. Explain Disorders of th...

Q. Explain Disorders of the gastrointestinal tract? The diseases and disorders of the gastrointestinal (GI) tract. Have you ever suffered from abnormal symptoms of the gastroin

Hunting and export - wildlife, Hunting and Export - Wildlife The hunti...

Hunting and Export - Wildlife The hunting and export of excessive numbers of certain animal species is another important factor leading to dangerous reductions in numbers. The

Explain restricted fragment polymorphism, Q. Explain Restricted fragment po...

Q. Explain Restricted fragment polymorphism? This method makes use of a group of enzymes termed restriction enzymes which recognise particular sequence of DNA and act as "molec

Coelomoducts of molluscs, Coelomoducts of Molluscs In Molluscs, like ...

Coelomoducts of Molluscs In Molluscs, like in Crustacea nephridia are absent. But certain of the larval pulmonates do possess protonephridia suggesting that they have been se

Define clinical feature and medical complication for bulimia, Define Clinic...

Define Clinical Features and Medical Complications for bulimia? Unlike, anorexia nervosa, in bulimia you will find that symptoms are more difficult to detect because patients a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd