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The ratios of mannuronic acid (M) to Guluronic acid (G) were determined in sodium alginate preparations from brown seaweeds. The M/G ratios widely varied according to the species of seaweed, ranging between 0.34 and 1.79. The M/G ratio of alginic acid preparation did not correlate with the intrinsic viscosity of its sodium salt solution, suggesting that the M/G ratio is not associated with the conformation of sodium alginate. On the other hand, the M/G ratios clearly correlated with its yield from a brown seaweed.

Mannuronic to guluronic acid ratios of alginic acids prepared from various brown seaweeds.