Deduce the structure of a disaccharide from the following information and find i

Question

Deduce the structure of a disaccharide from the following information and find its NAME in your
textbook or notes. Explain how you deduced the structure.
• Complete hydrolysis yields only D-glucose.
• It is hydrolyzed by a-glucosidase but not by ß-glucosidase.
• It does not reduce Cu2+ to Cu+.
(Incidentally, this disaccharide is the "blood sugar" found in the hemolymph of most insects; it has been suggested that it may act as a natural cryoprotectant, the polyhydroxy compound preventing damage to insect tissues from freezing and thawing.)
*Please show your work... Reasonable information which lead you to your conclusion)

Explanation / Answer

The disaccharide with the given information is TREHALOSE. - It is composed of two molecules of a-D-glucose and is also a nonreducing sugar. - It is found in the circulating fluid of many insects. The glandular portion of the corpora cardiaca is thought to secrete the hyperglycemic hormone that causes a rapid increase in blood levels of trehalose, the “blood sugar” of insects. - Trehalose, which occurs in organisms capable of surviving extreme dehydration, is used for freeze-drying methods of cryopreservation.

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