Skip to main content
Ch.13 Carbohydrates
Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 14th Edition
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Timberlake 14th EditionCh.13 Carbohydrates문제 57c
13장, 문제 57c

Melezitose, a carbohydrate secreted by insects, has the following Haworth structure:
Haworth structure of melezitose, a carbohydrate secreted by insects, with labeled hydroxyl groups and molecular formula.
c. Is melezitose a reducing sugar?

검증된 단계별 안내
1
Step 1: Understand the concept of a reducing sugar. A reducing sugar is a carbohydrate that can act as a reducing agent because it has a free aldehyde group (-CHO) or a free ketone group (-C=O) in its open-chain form. This property allows it to reduce other compounds, such as Benedict's reagent.
Step 2: Analyze the structure of raffinose. Raffinose is a trisaccharide composed of galactose, glucose, and fructose. In its structure, the glucose unit is linked to the galactose and fructose units through glycosidic bonds.
Step 3: Determine if the glucose unit in raffinose has a free anomeric carbon. The anomeric carbon is the carbon derived from the carbonyl group (C=O) in the open-chain form of the sugar. If this carbon is involved in a glycosidic bond, it is not free and cannot participate in redox reactions.
Step 4: Evaluate the fructose unit in raffinose. Fructose is a ketose sugar, and its anomeric carbon can also be involved in glycosidic bonding. If both the glucose and fructose units have their anomeric carbons involved in glycosidic bonds, raffinose will not have a free reducing end.
Step 5: Conclude whether raffinose is a reducing sugar. Based on the analysis, if all anomeric carbons in raffinose are involved in glycosidic bonds, it cannot act as a reducing sugar. This means raffinose is a non-reducing sugar.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
2m

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Reducing Sugars

Reducing sugars are carbohydrates that can donate electrons to another chemical, typically due to the presence of a free aldehyde or ketone group. This property allows them to reduce other compounds, which is a key characteristic in various biochemical reactions. Common examples include glucose and fructose, which can participate in redox reactions.
추천 영상:
가이드 코스
1:03
Ketoses as Reducing Sugars Concept 2

Raffinose Structure

Raffinose is a trisaccharide composed of galactose, glucose, and fructose. Its structure includes a galactose unit linked to a sucrose molecule, which is a combination of glucose and fructose. Understanding its structure is essential to determine its reactivity and whether it can act as a reducing sugar.
추천 영상:
가이드 코스
1:01
Structural Formula Concept 2

Haworth Projection

The Haworth projection is a way of representing the cyclic structure of carbohydrates, showing the arrangement of atoms in a ring form. This representation helps visualize the orientation of hydroxyl groups and other substituents, which is crucial for understanding the chemical properties and reactivity of sugars, including whether they are reducing or non-reducing.
추천 영상:
가이드 코스
2:18
Intro to Haworth Projections Concept 1
관련 실천
교과서 질문

What are the disaccharides and polysaccharides present in each of the following?

a. <IMAGE>

817
views
교과서 질문

 What are the disaccharides and polysaccharides present in each of the following?

a. <IMAGE>

652
views
교과서 질문

Melezitose, a carbohydrate secreted by insects, has the following Haworth structure:

a. Is melezitose a mono-, di-, or trisaccharide?

834
views
교과서 질문

 Identify each of the following pairs of Fischer projections as enantiomers or identical compounds:

a.

579
views
교과서 질문

Isomaltose, obtained from the breakdown of starch, has the following Haworth structure:

d. Is this the α or β isomer of isomaltose? 

656
views
교과서 질문

Melezitose, a carbohydrate secreted by insects, has the following Haworth structure:

b. What monosaccharides are present in melezitose?

987
views