Crosslinked sodium carboxymethylcellulose

Crosslinked sodium carboxymethylcellulose is a modified form of cellulose in which CMC chains have been chemically crosslinked into a three-dimensional insoluble network. This crosslinking renders the material insoluble in water — in contrast to the parent compound sodium CMC (E466), which dissolves readily. In food it functions as a bulking agent, dietary fibre source, and tablet disintegrant in food supplements and high-fibre food products. When consumed, it absorbs water in the gastrointestinal tract and contributes to a sense of fullness without contributing calories, as the crosslinked cellulose is not digested by human enzymes.

No specific JECFA numerical ADI has been established for crosslinked sodium CMC in food applications. As an insoluble, non-absorbable polymer, it passes through the gastrointestinal tract essentially intact, fermenting only partially in the colon. Its safety profile is supported by the extensive history of the parent compound (CMC, E466) and the additional insolubility conferred by crosslinking, which further limits any potential systemic exposure.

Crosslinked sodium CMC is approved in the EU as E468 for use as a bulking agent and dietary fibre source in specific food categories, including foods intended for weight control and high-fibre products. Its ability to absorb several times its weight in water and form a gel within the gastrointestinal tract makes it a functional ingredient in satiety-promoting products. Consumers looking to increase dietary fibre intake may encounter E468 in fibre supplements and functional foods. Like all bulk-forming fibres, it should be consumed with adequate fluid intake. No adverse effects have been identified at permitted use levels in healthy adults.