pectin
This substance acts as a natural glue within plant cell walls, providing the necessary rigidity and structure for fruits to maintain their shape. In a culinary context, it is the essential component that allows liquids to transform into a semi-solid gel when combined with sugar and acid. As a mass noun, it refers to the chemical compound itself rather than individual units. It is treated as an uncountable substance, meaning it does not have a plural form in standard usage and requires quantifiers like "amount of" or "concentration of" when referring to quantity.
Meanings
A soluble gelatinous polysaccharide that is present in the cell walls of terrestrial plants and is used as a gelling agent in jams and jellies.
"The recipe calls for adding pectin to the fruit puree to ensure the jam sets properly."