The reagent periodate (IO,") oxidatively cleaves the carbon-carbon bonds between two adjacent carbons carrying hydroxyl groups. Explain how pe- riodate oxidation might be used to distinguish between methyl glycosides of glucose in the pyranose and furanose forms.
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- The reagent periodate (IO4-) oxidatively cleaves the carbon–carbon bondsbetween two adjacent carbons carrying hydroxyl groups. Explain howperiodate oxidation might be used to distinguish between methyl glycosidesof glucose in the pyranose and furanose forms.Draw the structure of: (a) a polysaccharide formed by joining D-mannose units in 1→4-β- glycosidic linkages; (b) a polysaccharide formed by joining D-glucose units in 1→6-α- glycosidic linkages. The polysaccharide in (b) is dextran, a component of dental plaque.In solution, glucose is mostly found in the cyclic hemiacetal state, which lacks an aldehyde group. How are mild oxidising agents able to oxidise glucose?
- a) Label all the O atoms that are part of a glycoside in rebaudioside A. Rebaudioside A, marketed under the trade name Truvia, is a sweet glycoside obtained from the stevia plant, which has been used for centuries in Paraguay to sweeten foods. (b) The alcohol or phenol formed from the hydrolysis of a glycoside is called an aglycon. What aglycon and monosaccharides are formed by the hydrolysis of rebaudioside A?Lactose is a disaccharide in which a glycosidic linkage connects the monosaccharides galactose and glucose. OH НО OH (a) Identify the glycosidic linkage and the acetal carbon in lactose. (b) What type of glycosidic linkage does lactose have (i.e., is it 1,1'-, 1,2'-, etc., and is it a or B)? (c) People who are lactose intolerant are deficient in the enzyme lactase, and therefore cannot efficiently break down the disaccharide into its monosaccharides. When lactose is treated with aqueous acid, however, this hydrolysis can take place, though relatively slowly. Draw the complete, detailed mechanism and the products of the acid-catalyzed hydrolysis of lactose. Но ОН НО ОН ОН LactoseIn glycoside formation, the hemiacetal functional group of a cyclic monosaccharide is converted to an acetal group by reaction with a(an)
- Regarding 4-O- (α-D-psychofuranosyl) -β-D-allopyranose. Please indicate the RIGHT alternative: (a) The disaccharide reacts with CH3OH in an acid medium to form a glycoside that cannot be oxidized with HNO3. (b) It is a reducing disaccharide only in basic medium. (c) In the structure there is only one glycosidic bond that is of the type β 1-O-4 ' (d) The hydrolysis products of this disaccharide do not show mutarrotation. (e) The disaccharide structure contains two six-membered rings.Draw the structure of: a polysaccharide formed by joining D-mannose units in 1→4-β- glycosidic linkages;Cellobiose, a disaccharide obtained by the hydrolysis of cellulose, is composed of two glucose units joined together in a 1→4-β-glycoside bond. What is the structure of cellobiose?
- Which of the follwoing structures are a reducing sugar and which are notIs the ring a pyranose of furanose ring for glucoseD The following disaccharide contains a(n) (blank]-glycosidic linkage. HO CH₂OH ОН Oa-1,4 OB-1,4 a-1,6 O B-1,6 0 OH Question 6 double bond ssignments/syllabus ester bond ether bond amide bond HO A glycosidic bond between two monosaccharides can also be classified as a(n) [blank). OH OH Melebi OH MacBook Pro