Which of the following options is a non-reducing disaccharide? Trehalose Lactose Maltose Mannose Fructose

Break Down the Problem

1. Identify the characteristics of disaccharides.
2. Understand the concept of reducing and non-reducing sugars.
3. Analyze each option provided: Trehalose, Lactose, Maltose, Mannose, and Fructose.

Relevant Concepts

1. Disaccharides are sugars composed of two monosaccharide units.
2. Reducing sugars can reduce mild oxidizing agents due to the free aldehyde or ketone group.
3. Non-reducing sugars do not have a free aldehyde or ketone group; examples include sucrose and trehalose.

Analysis and Detail

1. Trehalose: A non-reducing disaccharide formed from two glucose molecules. It does not have a free reducing group.
2. Lactose: A reducing disaccharide made of glucose and galactose, which has a free aldehyde group.
3. Maltose: A reducing disaccharide composed of two glucose units with a free aldehyde group.
4. Mannose: This is actually a monosaccharide, not a disaccharide.
5. Fructose: A monosaccharide as well, not a disaccharide.

Verify and Summarize

After analyzing each option, we find that Trehalose is the only non-reducing disaccharide listed among the options.

Final Answer

The non-reducing disaccharide is Trehalose.