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

Management of ventricular septal defect, Management   In case of  small...

Management   In case of  small defects surgical treatment is not indicated because spontaneous closure may occur before one to two years of  age. Patient  is treated for conges

Explain the food intolerance, Explain the Food Intolerance? What is foo...

Explain the Food Intolerance? What is food intolerance? How does it differ from food allergy? Food intolerance like food allergy is an adverse reaction to food. Food intoleranc

What is phosphorylation, Q. What is phosphorylation? What are various biolo...

Q. What is phosphorylation? What are various biological processes in which phosphorylation plays a critical role? Phosphorylation is the name given to procedure of the addition

Describe how platelets interact to form a blood clot, Describe briefly how...

Describe briefly how platelets, fibrin and red cells interact to form a blood clot.   Platelets release a substance which, indirectly, causes fibrinogen to be changed to fi

Define biochemistry, Biochemistry : The chemistry  of  living organisms ...

Biochemistry : The chemistry  of  living organisms that covers all  the chemical reactions occurring  in our body.

Determine the blood plasma levels of glucose, Which of the following serves...

Which of the following serves as an actuating signal, or as part of an actuating signal, in a negative feedback system? A. Blood plasma levels of Glucose. B. Blood plasma le

Explain arthritis, Explain Arthritis Arthritis - Oral therapy with doxy...

Explain Arthritis Arthritis - Oral therapy with doxycycline or amoxicillin for 28 days is usually effective for treatment of Lyme arthritis. Patients who have not responded to

How do placental mammals reproduce, How do placental mammals reproduce? ...

How do placental mammals reproduce? Placental mammals reproduce sexually, they have internal fecundation and they are viviparous, i.e., their embryo creates within the mother's

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