Inulin

Structural formula of inulin

Inulin is a naturally occurring polysaccharide produced by many types of plants. It belongs to a class of dietary fibers known as fructans. Inulin is used by some plants as a means of storing energy and is typically found in roots and rhizomes. It is increasingly used in food products, due to its beneficial health effects and functional properties.

Structure and Composition

Inulin is composed of fructose units, typically with a terminal glucose unit, linked together by _(2_1) glycosidic bonds. The degree of polymerization (DP) of inulin can vary, typically ranging from 2 to 60 fructose units. This variation in chain length affects its solubility and functional properties in food applications.

Sources of Inulin

Inulin is found in a variety of plants, including:

• Chicory
• Jerusalem artichoke
• Dahlia
• Agave
• Garlic
• Onion

These plants store inulin as an energy reserve, which can be hydrolyzed to release fructose when needed.

Health Benefits

Inulin is considered a prebiotic, meaning it promotes the growth of beneficial bacteria in the gut microbiota. It is not digested in the upper gastrointestinal tract, allowing it to reach the colon where it is fermented by bacteria. This fermentation process produces short-chain fatty acids, which have various health benefits, including:

• Improved digestive health
• Enhanced calcium absorption
• Regulation of blood sugar levels

Uses in Food Industry

Inulin is used in the food industry for its functional properties, such as:

• Fat replacement: Inulin can mimic the texture of fat, making it useful in low-fat products.
• Sugar replacement: It provides a mild sweetness and can be used to reduce sugar content.
• Fiber enrichment: Inulin increases the fiber content of foods, contributing to dietary fiber intake.

Related Pages

• Dietary fiber
• Prebiotics
• Gut microbiota
• Fructose