Define the following terms : (3 marks)
(i) Glycosidic linkage (ii) Invert sugar (iii) Oligosaccharides
(i) Glycosidic linkage : The two monosaccharide units are joined together through an ethernal or
oxide linkage formed by loss of a molecule of water. Such a linkage between two monosaccha-
ride units through oxygen atoms is called glycosidic linkage.
(ii) Invert sugar : An equimolar mixture of glucose and fructose obtained by hydrolysis of
sucrose in presence of an acid such as dil. HCl or the enzyme invertase or sucrase is called
(iii) Oligosaccharides : Those carbohydrates which on hydrolysis give 2-10 molecules of mono-
saccharides are called oligoasaccharides.
Example : sucrose, maltose.