{"id":218442,"date":"2025-05-23T19:15:12","date_gmt":"2025-05-23T19:15:12","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=218442"},"modified":"2025-05-23T19:15:16","modified_gmt":"2025-05-23T19:15:16","slug":"name-the-disaccharide","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/23\/name-the-disaccharide\/","title":{"rendered":"Name the disaccharide"},"content":{"rendered":"\n

Name the disaccharide (shown at right) formed by glycosidic linkage of D-Glucose and D-Fructose. ? Name this disaccharide: Do you expect this disaccharide to be a reducing sugar? Briefly explain. H OH HOCH2 H CH2OH H OH H O H HO OH H H O OH H CH2OH<\/p>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

The disaccharide formed by the glycosidic linkage of D-Glucose<\/strong> and D-Fructose<\/strong> is sucrose<\/strong>.<\/p>\n\n\n\n

Is Sucrose a Reducing Sugar?<\/h3>\n\n\n\n

No<\/strong>, sucrose is not<\/strong> a reducing sugar.<\/p>\n\n\n\n

\n\n\n\n

<\/h3>\n\n\n\n

Disaccharides<\/strong> are carbohydrates composed of two monosaccharide units linked by a glycosidic bond. In the case of sucrose<\/strong>, the two monosaccharides involved are D-glucose<\/strong> and D-fructose<\/strong>. Specifically, sucrose is formed when the anomeric carbon of \u03b1-D-glucose (C1)<\/strong> forms a glycosidic bond with the anomeric carbon of \u03b2-D-fructose (C2)<\/strong>. This linkage is referred to as an \u03b1(1\u21922)\u03b2 glycosidic bond<\/strong>.<\/p>\n\n\n\n

To understand whether a disaccharide is a reducing sugar<\/strong>, it is important to consider the availability of a free anomeric carbon<\/strong> capable of acting as a reducing agent<\/strong>. A reducing sugar must possess a hemiacetal (for aldoses like glucose) or a hemiketal (for ketoses like fructose) group that can open to form a free aldehyde or ketone group in solution. This open-chain form is essential for the sugar to participate in redox reactions, such as reducing Benedict’s or Fehling’s solution.<\/p>\n\n\n\n

In sucrose<\/strong>, both the anomeric carbons (C1 of glucose and C2 of fructose) are involved in the glycosidic bond. As a result, neither glucose nor fructose in sucrose has a free anomeric carbon that can revert to the open-chain form. Therefore, sucrose lacks the necessary functional group to act as a reducing agent<\/strong>.<\/p>\n\n\n\n

This is why sucrose does not react with Tollens’, Benedict\u2019s, or Fehling\u2019s reagents<\/strong>, which are commonly used to test for reducing sugars. It remains non-reactive in these tests<\/strong>, distinguishing it from reducing disaccharides like maltose<\/strong> or lactose<\/strong>, which do contain a free hemiacetal group.<\/p>\n\n\n\n

In summary, sucrose is the disaccharide formed by D-glucose and D-fructose, and due to the involvement of both anomeric carbons in the glycosidic bond, it is non-reducing<\/strong>.<\/p>\n\n\n\n

\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

Name the disaccharide (shown at right) formed by glycosidic linkage of D-Glucose and D-Fructose. ? Name this disaccharide: Do you expect this disaccharide to be a reducing sugar? Briefly explain. H OH HOCH2 H CH2OH H OH H O H HO OH H H O OH H CH2OH The Correct Answer and Explanation is: The […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-218442","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/218442","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=218442"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/218442\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=218442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=218442"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=218442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}