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

Define glycogenolysis, Define Glycogenolysis Glycogenolysis : degrad...

Define Glycogenolysis Glycogenolysis : degradation of glycogen.

Oxidative phosphorylation, Oxidative phosphorylation Oxidative phosphor...

Oxidative phosphorylation Oxidative phosphorylation is a metabolic pathway which uses energy released through the oxidation of nutrients to generate adenosine triphosphate (ATP

Explain the aseptic technique - sub culturing, Explain the Aseptic Techniqu...

Explain the Aseptic Technique - Sub Culturing? Aseptic technique is a series of procedures used to prevent contamination of cultures and sterile culture media. It is one of the

Oxidation reduction potential, what exactly is oxidation and reduction pote...

what exactly is oxidation and reduction potential and how its an imp. factor in spoiling meat

Organisation of the marine ecosystem, Organisation of the Marine Ecosystem ...

Organisation of the Marine Ecosystem The oceans like lakes, exhibit zonations. First describe the various zones or regions of the oceans and then later deal with the biota occ

Human biology, can i get a complete note to conceptualise human biology for...

can i get a complete note to conceptualise human biology for medical entrance preparation?

Food and digestion, what is the pH inside the stomach?Why is there a need t...

what is the pH inside the stomach?Why is there a need to keep that pH level? How is it maintained?

Describe the physiology of atrial septal defect, Describe the Physiology of...

Describe the Physiology of atrial septal defect? In ASD the magnitude of left to right shunt is determined by the size of the defect and the relative compliance of the right ve

Explain the secondary structure of proteins, Explain the Secondary structur...

Explain the Secondary structure of proteins The secondary structure of a protein involves the way that the chain of amino acid either twists or folds back upon itself to form 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