题目
CHE 008B A01 SS1 2025 Lecture 11/12 - Disaccharides
多重下拉选择题
Select the appropriate disaccharide for each statement: sucrose is a non-reducing sugar. cellobiose is never digestible by humans, and lactose is only sometimes digestible by humans. maltose is an alpha-linked diglucose and cellobiose is a beta-linked diglucose. lactose is found in milk, maltose is found in beer, and sucrose is table sugar.
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思路分析
Question stem: Select the appropriate disaccharide for each statement. There are four statements, each with one or more dropdowns to fill with a disaccharide.
Statement 1: 'sucrose is a non-reducing sugar.'
- Correct choice: sucrose. Sucrose is a non-reducing sugar because it lacks a free anomeric carbon capable of being oxidized; its glucose and fructose units are linked through their anomeric carbons (α-D-glucopyranosyl 1→2β-fructofuranoside), which prevents the reducing end from being available in standard Benedict/Fehling-type tests.
- Why the other common disaccharides are not chosen here (conceptual contrasts): lactose and maltose each have a free anomeric carbon on one of their units (they are reducing). ......Login to view full explanation登录即可查看完整答案
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