FAQs

Why is acid stability a critical limitation for carrageenan solutions at high temperatures, and how can it be mitigated?

At elevated temperatures (above 60°C) and under acidic conditions (pH below 4.5), carrageenan is highly susceptible to acid hydrolysis (autohydrolysis). The high temperature and hydronium ions attack the alpha-1,3 and beta-1,4 glycosidic bonds that link the galactose units, rapidly cleaving the long-chain polymers into short-chain fragments. This molecular weight reduction results in a permanent, severe loss of gel strength and viscosity. To mitigate this in processing (e.g., acidic fruit jelly production), the food acids should be held back and dosed at the very last stage of the manufacturing process—ideally just before cooling and filling (below 70°C)—to minimize high-temperature acid exposure time.