Pectin

Pectin is a family of plant-cell-wall polysaccharides rich in galacturonic acid. It helps bind plant cells and forms gels used in foods such as jams and jellies.

Homogalacturonan: A pectin polysaccharide made mainly of repeating galacturonic acid units. This major pectin domain supplies many of the carboxyl groups involved in gel formation.
Jam: A fruit preserve made by cooking fruit with sugar, often to a spreadable gel. Pectin helps jam set as the cooked mixture cools.
Galacturonic acid: A sugar acid that forms the principal repeating residue in many pectin domains. Its linked residues make up much of pectin’s backbone.
Henri Braconnot: A French chemist who isolated and named pectin in the early nineteenth century. His work established pectin as a distinct plant-derived substance.
Rhamnogalacturonan I: A pectin domain with a repeating rhamnose–galacturonic acid backbone and variable side chains. Its branched structure contributes to pectin’s diversity and interactions in cell walls.
Jelly: A clear fruit preserve made from fruit juice and set into a spreadable gel. Pectin provides the network that gives many jellies their shape and texture.
Polysaccharide: A carbohydrate composed of many monosaccharide units joined by glycosidic bonds. Pectin belongs to this broad class of sugar polymers.
Pectic substances: A group of plant-cell-wall materials that includes pectin and related polysaccharides. Pectin is the best-known member of this broader family of wall components.
Degree of methylesterification: The proportion of galacturonic acid carboxyl groups in pectin that are methyl-esterified. This property helps determine which conditions allow pectin chains to form gels.
Low-sugar jam: A fruit preserve formulated with less sugar than conventional jam. Low-methoxyl pectin can set these products without relying on high sugar levels.

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