{"id":1755,"date":"2024-03-02T17:07:06","date_gmt":"2024-03-02T17:07:06","guid":{"rendered":"https:\/\/cake.appscodestudio.com\/?p=1755"},"modified":"2024-03-02T17:07:07","modified_gmt":"2024-03-02T17:07:07","slug":"formation-of-glycosides","status":"publish","type":"post","link":"https:\/\/cake.appscodestudio.com\/index.php\/2024\/03\/02\/formation-of-glycosides\/","title":{"rendered":"Formation of glycosides"},"content":{"rendered":"\n

The hydroxyl group that is attached to the anomeric\u00a0carbon\u00a0atom\u00a0(i.e., the carbon containing the aldehyde or keto group) of carbohydrates in\u00a0solution\u00a0has unusual reactivity, and derivatives, called\u00a0glycosides, can be formed; glycosides formed from glucose are called glucosides. It is not possible for equilibration between the \u03b1- and \u03b2-anomers of a\u00a0glycoside\u00a0in solution (i.e., mutarotation) to occur. The reaction by which a glycoside is formed involves the hydroxyl group (\u2015OH) of the anomeric carbon atom (numbered 1) of both \u03b1 and \u03b2 forms of\u00a0D-glucose\u2014\u03b1 and \u03b2 forms of\u00a0D-glucose are shown in\u00a0equilibrium\u00a0in the reaction sequence\u2014and the hydroxyl group of an alcohol (methyl alcohol\u00a0in the reaction sequence); methyl \u03b1-D-glucosides and \u03b2-D-glucosides are formed as products, as is water.<\/p>\n\n\n\n

\"Carbohydrates.<\/figure>\n\n\n\n

Among the wide variety of naturally occurring glycosides are a number of plant\u00a0pigments, particularly those red, violet, and blue in\u00a0colour; these pigments are found in\u00a0flowers\u00a0and consist of a pigment\u00a0molecule\u00a0attached to a sugar molecule, frequently glucose. Plant indican (from\u00a0Indigofera<\/em>\u00a0species), composed of glucose and the pigment indoxyl, was important in the preparation of\u00a0indigo\u00a0dye before\u00a0synthetic\u00a0dyes became prevalent. Of a number of\u00a0heart\u00a0muscle stimulants that occur as glycosides,\u00a0digitalis\u00a0is still used. Other naturally occurring glycosides include vanillin, which is found in the\u00a0vanilla\u00a0bean, and amygdalin (oil of bitter\u00a0almonds); a variety of glycosides found in\u00a0mustard\u00a0have a\u00a0sulfur\u00a0atom at position 1 rather than\u00a0oxygen.<\/p>\n\n\n\n

A number of important\u00a0antibiotics\u00a0are glycosides; among the best known are\u00a0streptomycin\u00a0and\u00a0erythromycin. Glucosides\u2014i.e., glycosides formed from glucose\u2014in which the anomeric carbon atom (at position 1) has\u00a0phosphoric acid\u00a0linked to it, are extremely important biological compounds. For example, \u03b1-D-glucose-1-phosphate is an intermediate product in the\u00a0biosynthesis\u00a0of\u00a0cellulose,\u00a0starch, and glycogen; similar glycosidic phosphate\u00a0derivativ<\/a>es\u00a0of other monosaccharides participate in the formation of naturally occurring glycosides and\u00a0polysaccharides.<\/p>\n\n\n\n

\"Carbohydrates.<\/figure>\n\n\n\n

The hydroxyl groups other than the one at the anomeric carbon atom can undergo a variety of reactions.\u00a0Esterification, which consists of reacting the hydroxyl groups with an appropriate acidic compound, results in the formation of a class of compounds called sugar\u00a0esters. Among the common ones are the sugar acetates, in which the acid is\u00a0acetic acid. Esters of phosphoric acid and\u00a0sulfuric acid\u00a0are important biological compounds; glucose-6-phosphate, for example, plays a central role in the\u00a0energy\u00a0metabolism\u00a0of most living\u00a0cells, and\u00a0D-ribulose 1,5-diphosphate is important in\u00a0photosynthesis.<\/p>\n","protected":false},"excerpt":{"rendered":"

The hydroxyl group that is attached to the anomeric\u00a0carbon\u00a0atom\u00a0(i.e., the carbon containing the aldehyde or keto group) of carbohydrates in\u00a0solution\u00a0has unusual reactivity, and derivatives, called\u00a0glycosides, can be formed; glycosides formed from glucose are called glucosides. It is not possible for equilibration between the \u03b1- and \u03b2-anomers of a\u00a0glycoside\u00a0in solution (i.e., mutarotation) to occur. The reaction […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[3],"tags":[],"class_list":["post-1755","post","type-post","status-publish","format-standard","hentry","category-carbohydrates"],"Cooking_time":"","_links":{"self":[{"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1755","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=1755"}],"version-history":[{"count":1,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1755\/revisions"}],"predecessor-version":[{"id":1756,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1755\/revisions\/1756"}],"wp:attachment":[{"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=1755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=1755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=1755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}