Puba (carimã, Brazilian fermented cassava pulp)

A fermented cassava pulp

Puba, also called carimã, is made by fermenting cassava roots in water until they soften. The drained pulp is distinct from cassava flour, sour starch and other fermented cassava foods. A 2022 review describes the pulp being pressed and dried to make a separate product called puba seca.

A 1998 paper calls puba a common food in northeastern Brazil and notes that earlier authors had described the process. That statement records a regional association; the paper does not establish when or where the food originated.

Fermentation and reported uses

The 1998 study describes spontaneous fermentation, with lactic fermentation and microbial softening of the roots. Its background reviews earlier microbiology research, so details about a universal microbial sequence cannot be inferred from this experiment.

A 2022 review reports puba used in savory dishes, cakes, cookies, sweets, porridges and mush. These are uses summarized by a secondary source; the sources reviewed here do not map individual dishes to particular regions or provide a tested serving recipe.

What one study measured

In the natural-fermentation control of the 1998 experiment, researchers used 3–4 kg of washed, peeled cassava roots with tap water at 2 litres per kilogram in plastic containers. The methods describe about seven days until the roots softened; the results give 7–8 days at 20–22 °C. Researchers drained and sieved the material, then dried it at 35 °C for about 48 hours. These are conditions from one research batch, not household instructions.

The paper also tested commercial enzyme preparations in separate treatments. Those treatments are not part of the natural-fermentation control described above.

Limits of the evidence

The study does not report the batch’s cyanogen content, finished yield, validated home controls or storage life. Cassava contains cyanogenic glycosides that can release harmful hydrogen cyanide, but the general warning in FSANZ guidance does not validate this puba process. Fermentation, softening and drying in the study are not demonstrated safety endpoints.

The reviewed sources do not establish an executable household method, a universal duration or a safe storage period. This article describes the evidence and is not a recipe.

Open questions in the sources

The earlier historical works cited by the 1998 article were not inspected, so an earliest attestation, origin date and seasonal history remain unresolved.

The study shows no cyanogen result, finished yield, household safety controls or storage evidence; its experimental batch cannot be used as a validated home procedure.

The 2022 review's dish list is secondary evidence and does not establish where each use is practiced.