Pectin
Plant cell wall polymer used as a gelling agent in foods.
Pectin is a heteropolysaccharide and structural polymer found in the cell walls and middle lamellae of terrestrial plants. It is commercially produced as a white-to-light-brown powder from citrus fruits and used as an edible gelling agent, especially in jams, jellies, dessert fillings, medications, and sweets.
- isolated_by
- Henri Braconnot
- chemical_class
- heteropolysaccharide
- principal_component
- galacturonic acid
- common_sources
- citrus fruits, apples, pears, guavas, quince, plums, gooseberries
- typical_level_in_citrus_peels
- 30%
- typical_level_in_rose_hips
- 15%
Lore & Background
It is composed of complex polysaccharides abundant in the green parts of terrestrial plants and is the principal component of the middle lamella, where it binds cells. During fruit ripening, pectin is broken down by the enzymes pectinase and pectinesterase, causing fruit to soften as middle lamellae break down and cells separate. A similar process occurs in the abscission zone of deciduous plants at leaf fall.
Reader's Guide
Pectin is significant as a natural dietary fiber that, while not digested in the small intestine, is fermented in the large intestine and has a positive effect on decreasing LDL cholesterol levels and lowering post-prandial glucose levels. It binds to cholesterol in the gastrointestinal tract and slows glucose absorption by trapping carbohydrates. Pectin has also been observed to have some function in repairing the DNA of certain plant seeds, particularly desert plants, by creating a mucilage layer that holds dew. Its chemical structure includes smooth and hairy regions, with the degree of methylation and acetylation determining its functional properties, leading to classifications such as pectic acids, low-methoxy pectins, and high-methoxy pectins.
Did You Know?
- Citrus peels contain up to 30% pectin, while rose hips contain about 15%.
- In human digestion, pectin binds to cholesterol and slows glucose absorption.
- Pectin has been observed to help repair DNA in some desert plant seeds.
Frequently Asked Questions
Who is Pectin?
Pectin is a heteropolysaccharide, meaning it is a structural polymer built from several different sugar units, and it resides in the cell walls and middle lamellae of terrestrial plants. Its principal building block is galacturonic acid.
What are Pectin's powers/role?
In living plant tissue, Pectin acts as a structural component that helps hold cells together within their walls and in the middle lamella. In the kitchen it serves as an edible gelling agent, giving jams, jellies, dessert fillings, and certain medications their characteristic firm set.
Where does Pectin come from?
Pectin is most concentrated in citrus peels, where it can make up roughly 30 % of the peel's composition, and it is also found in apples, pears, guavas, quince, plums, and gooseberries. Rose hips carry about 15 % Pectin, and commercially the molecule is harvested as a white-to-light-brown powder.
Who discovered Pectin?
The French chemist Henri Braconnot is credited with first isolating Pectin from plant material in the early nineteenth century, identifying it as a distinct substance separate from the sugars and starches around it.
Why is Pectin important?
Beyond its indispensable role as a natural gelling agent in food manufacturing, Pectin functions as a dietary fiber that supports gut health. Structurally, it keeps terrestrial plant tissues intact, making it essential to the architecture of virtually every land plant.
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