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The potential of postharvest culture in low-nutrient conditions was evaluated in terms of enhancement of carrageenan gel quality in the tropical seaweed  Eucheuma denticulatum  (“spinosum” of commerce) and as an alternative to industrial alkali treatment. Postharvest batch culture of seaweeds with either initially low or high nutrient concentrations (both ending with low nutrient concentrations) produced native carrageenans that had significantly higher gel strengths (48 g cm -2  in both treatments) than those treated with continuous culture in high nutrient concentrations (18 g cm -2 ). The gel strength of native carrageenans from batch-cultured seaweeds was also significantly higher than that of both native and alkali-treated carrageenans from seaweeds that had not undergone postharvest culture (11 and 29 g cm -2 , respectively). The mechanism indicated for the enhancement of carrageenan gel quality involves stopping the production of precursor (galactose-6-sulfate) and converting the preexisting precursor to 3,6-anhydrogalactose units through  in vivo  enzymatic action. Postharvest batch culture with low nutrient concentrations is considered to be an eco-friendly alternative to industrial alkali treatment in the enhancement of carrageenan gel quality.

botanica marina

Enhancement of carrageenan gel quality in the commercially important tropical seaweed  Eucheuma denticulatum  (Rhodophyta), with postharvest treatment in low-nutrient conditions