Question:
Lactulose is a disaccharide of
Lactulose is a disaccharide of
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Lactulose serves as a heat load chemical marker in milk processing and functions biologically as a prebiotic and osmotic laxative.
Updated On: Sep 15, 2026
- Mannose and fructose
- Galactose and fructose
- Mannose and glucose
- Glucose and maltose
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Lactulose is a synthetic non-digestible disaccharide formed during heat processing or alkaline isomerization of milk lactose.
Step 2: Detailed Explanation:
During thermal processing (such as UHT sterilization), lactose ($\beta$-D-galactopyranosyl-(1$\to$4)-D-glucose) undergoes Lobry de Bruyn--Alberda van Ekenstein rearrangement.
In this transformation, the reducing D-glucose moiety isomerizes into D-fructose, forming 4-O-$\beta$-D-galactopyranosyl-D-fructose (lactulose).
Step 3: Final Answer:
Therefore, lactulose is a disaccharide composed of galactose and fructose.
Lactulose is a synthetic non-digestible disaccharide formed during heat processing or alkaline isomerization of milk lactose.
Step 2: Detailed Explanation:
During thermal processing (such as UHT sterilization), lactose ($\beta$-D-galactopyranosyl-(1$\to$4)-D-glucose) undergoes Lobry de Bruyn--Alberda van Ekenstein rearrangement.
In this transformation, the reducing D-glucose moiety isomerizes into D-fructose, forming 4-O-$\beta$-D-galactopyranosyl-D-fructose (lactulose).
Step 3: Final Answer:
Therefore, lactulose is a disaccharide composed of galactose and fructose.
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