Pectic acid

A complex polysaccharide found in plant cell walls

Pectic Acid

Chemical structure of pectic acid

Pectic acid is a complex polysaccharide that is found in the cell walls of plants. It is a component of pectin, which is a structural heteropolysaccharide contained in the primary cell walls of terrestrial plants. Pectic acid is formed by the de-esterification of pectin and is composed mainly of galacturonic acid units.

Structure and Composition

Pectic acid is a linear chain of _-(1_4)-linked D-galacturonic acid residues. The carboxyl groups of these residues can be partially or fully methylated, and the degree of methylation affects the properties of the pectic acid. In its fully de-esterified form, pectic acid is known as polygalacturonic acid.

Function in Plants

In plants, pectic acid plays a crucial role in maintaining the structural integrity of the cell wall. It is involved in cell adhesion and provides rigidity to the plant tissues. During the ripening of fruit, pectic acid is broken down by enzymes such as pectinase, leading to the softening of the fruit.

Industrial and Commercial Uses

Pectic acid and its derivatives are used in various industrial applications. In the food industry, pectic acid is used as a gelling agent, thickener, and stabilizer in products like jams and jellies. It is also used in the production of fruit juices and as a fat substitute in baked goods.

Biological and Health Implications

Pectic acid is a source of dietary fiber and has been studied for its potential health benefits. It may aid in digestion and help lower cholesterol levels. Additionally, pectic acid has been investigated for its role in cancer prevention and treatment, although more research is needed in this area.

Related Pages

• Pectin
• Galacturonic acid
• Cell wall
• Polysaccharide
• Pectinase