Difference Between Glucose and Fructose

Important carbohydrates required for the body are glucose, fructose, and sucrose. Glucose and fructose are simple sugars. Simple carbohydrates are classified into two types. They are monosaccharides and disaccharides. Monosaccharides are made of one sugar unit and are the most basic form of sugar. Example of monosaccharides – glucose and fructose.

Disaccharides are formed with the dehydration reaction. They are formed with two monosaccharides by removing a water molecule. Example – sucrose.


It is a monosaccharide. It is found in all major carbohydrates like starch, table sugar etc. It is also known as blood sugar or grape sugar. It is a six-membered ring. It forms a pyranose ring structure. It is aldohexose. It is the primary and preferred energy source of the body. Starch contains glucose.


It is a monosaccharide. It is found in vegetables and fruits. The glycemic index is lower in fructose when compared to glucose. The binding of fructose to cellular protein is seven times faster than glucose. Fructose is also called fruit sugar or D- fructose. Its functional group is the ketone. It is metabolized mainly in the liver. It is not found in starch.

To make you understand how glucose and fructose are different from each other, here are some major differences between glucose and fructose:

Difference between Glucose and Fructose
Also known as grape sugar Also known as fruit sugar
Six-membered ring Five-membered ring
The preferred energy source for the body Not the preferred energy source for brain and muscles
Less lipogenic More lipogenic
Less fat producing More fat producing
Relies on hexokinase/ glucokinase for

initiating metabolism

Relies on fructokinase for initiating metabolism
It is an aldohexose It is a ketohexose
Forms a pyranose ring structure Forms a furan ring structure

Recommended Videos

Classification Of Carbohydrates And Its Structure


These were some important difference between fructose and glucose. To know the differences between other topics in chemistry you can register to BYJU’S or download our app for simple and interesting content. India’s largest k-12 learning app with top-notch teachers from across the nation with excellent teaching skills. Find notes and question papers for other subjects like Mathematics, Physics, Biology and various competitive exams as well. Enjoy learning with great experience. Learning is no more boring with BYJU’S.

Frequently Asked Questions – FAQs


What is glucose?

Glucose is a monosaccharide sugar found in the blood that functions as the primary energy source of the body. It is formed by the hydrolysis of sucrose.


What is fructose?

Fructose is a monosaccharide sugar found in vegetables and fruits. The glycemic index value of fructose is lower than glucose.


Is honey glucose or fructose?

Honey is made up of 40 percent fructose and 30 percent glucose. Due to the high fructose level, honey is sweeter than sugar. The GI value of honey is around 55.


What is a monosaccharide?

Sugar that can not be further decomposed into simpler sugars by hydrolysis is known as a monosaccharide. Glucose and fructose are examples of monosaccharides.


What is the primary difference between glucose and fructose?

Glucose and fructose are isomers because they have an identical molecular formula but different structural formulas. Glucose consists of an aldehyde group while fructose consists of a ketone functional group.

Also Read

Classification of carbohydrates Monosaccharides
Test your Knowledge on Difference between glucose and fructose!


Leave a Comment

Your Mobile number and Email id will not be published.