Bitter cassava (mandioca-brava) is a group of cassava lines described as having high levels of cyanogenic compounds (compostos cianogênicos) in their roots. In Brazil they are called mandioca-brava, distinguished from sweet cassava for direct eating (mandioca-mansa/aipim), and used exclusively as ingredients for processed foods such as flour and starch.
「苦味種」 (in translation: "bitter type") names the cassava group called mandioca-brava in Brazil, distinguished from sweet mandioca-mansa (also called aipim) sold for eating raw or with light processing. The name refers to a classification based on higher root levels of cyanogenic compounds (compostos cianogênicos), not to bitterness perceived by taste. A Brazilian public technical document clearly distinguishes the two groups.
Bitter cassava is not used for eating raw. It is used exclusively as an ingredient for processed foods such as farinha (flour), beiju, and tapioca. The same technical document lists these as processing uses for the bitter group, clearly distinguishing it in use from sweet cassava whose roots are cooked and eaten directly.
Oliveira, Luciana Alves de; Motta, Joselito da Silva; Jesus, Jaciene Lopes de; Sasaki, Fabiana Fumi Cerqueira; Viana, Eliseth de Souza / 2019 / government document / full text checked
Checked for this overview: Checked the statement that the names distinguishing bitter and sweet cassava derive from cyanogenic-compound content. / Checked the description of the bitter group being used as material for farinha, beiju, tapioca, and other processed foods.
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Composition and content (2)
Bitter cassava (mandioca-brava) differs from Unlike the sweet variety (mandioca-mansa, commonly known as aipim) sold for eating raw or lightly processed, mandioca-brava is given this name because of the high level of cyanogenic compounds (compostos cianogênicos) in its root, and is used exclusively for processing.contextual
Scope: A description centered on the Recôncavo Baiano region of Brazil
Note: Records only the origin of the name and the distinction in use, without touching on toxicity figures or mechanisms.
Original text: "A mandioca-mansa, também conhecida como aipim, é comercializada como vegetal fresco...A mandioca-brava é assim denominada devido ao maior teor de compostos cianogênicos na raiz e é utilizada como matéria-prima na produção de farinhas, beijus, tapiocas, entre outros produtos." (in translation: "Mandioca-mansa, also known as aipim, is sold as a fresh vegetable...Mandioca-brava is given this name because of the higher level of cyanogenic compounds in the root, and is used as a raw material in the production of farinha, beiju, tapioca, and other products.")
Limitations: A general description in an official technical document; it does not include compositional analysis values for individual lots.
Source: Processamento de aipim e mandioca-brava (Oliveira, Luciana Alves de; Motta, Joselito da Silva; Jesus, Jaciene Lopes de; Sasaki, Fabiana Fumi Cerqueira; Viana, Eliseth de Souza, 2019) · full text checked
Show dataingredient-bitter-cassava —differs_from→ "Unlike the sweet variety (mandioca-mansa, commonly known as aipim) sold for eating raw or lightly processed, mandioca-brava is given this name because of the high level of cyanogenic compounds (compostos cianogênicos) in its root, and is used exclusively for processing."
Bitter cassava (mandioca-brava) is defined as Cultivars with an HCN content, per fresh weight of root, below 100 mg/kg are called 'sweet cassava,' and those from 100 to 500 mg/kg FW are called 'bitter cassava.'supported
Scope: Manihot esculenta (3,354 landrace and breeding lines originating from 26 Brazilian states)
Note: The authors add that while this agronomic naming distinguishes between cultivars in Latin America, it is in some cases not distinguished in Africa. The body text contains no data verifying, through human sensory testing, the correspondence between the naming and the measured HCN values.
Confirmed the definition statement: "cultivars with an HCN content below 100 mg/kg fresh weight are called 'sweet cassava,' and those from 100 to 500 mg/kg FW are called 'bitter cassava.'"
Limitations: This threshold and naming are themselves an agronomic classification by HCN content, not a verification through human sensory testing.
Show dataingredient-bitter-cassava —is_defined_as→ "Cultivars with an HCN content, per fresh weight of root, below 100 mg/kg are called 'sweet cassava,' and those from 100 to 500 mg/kg FW are called 'bitter cassava.'"
Bitter cassava (mandioca-brava) — currently proposed mechanisms: 2 major QTL: the MATE-type transporter gene Manes.16G007900 on chromosome 16 (SNP S16_773999) explains up to 30% of genetic variation in root HCN concentration, while the H+-ATPase gene Manes.14G073900.1 on chromosome 14 (SNP S14_6021712) explains up to 7%.supported
Scope: Roots of Manihot esculenta.
Note: Based on multiyear field trials with broad-sense heritability 0.82 and narrow-sense heritability 0.41. Only HCN was measured, by picric-acid titration; no human sensory test was conducted. This source alone cannot establish a link to perceived bitterness.
Identified as major QTL the MATE-type transporter gene Manes.16G007900 on chromosome 16 (SNP S16_773999), explaining up to 30% of genetic variation in root HCN concentration, and the H+-ATPase gene Manes.14G073900.1 on chromosome 14 (SNP S14_6021712), explaining up to 7%.
Limitations: No human sensory test was conducted. This source alone cannot establish the link to sensory bitterness itself.
Show dataingredient-bitter-cassava —has_currently_proposed_mechanisms→ "2 major QTL: the MATE-type transporter gene Manes.16G007900 on chromosome 16 (SNP S16_773999) explains up to 30% of genetic variation in root HCN concentration, while the H+-ATPase gene Manes.14G073900.1 on chromosome 14 (SNP S14_6021712) explains up to 7%."
Bitter cassava (mandioca-brava) can be debittered by: CRISPR/Cas9 knockout of the MeCYP79D1 gene (exon 3). In leaves, linamarin content fell from 2.72±0.17 g/kg fresh weight in wild type to 0.65±0.03 g/kg fresh weight in the mutant, and cyanide yield from 201.0±0.99 mg/kg to 17.44±2.482 mg/kg; both decreasing to about 1/7.supported
Note: Only HPLC (linamarin) and the picric-acid method (cyanide) were used for quantification; the authors explicitly state that they did not assess taste or sensory perception. The term 'debittering' refers to reducing compound levels; this source alone cannot establish a connection to sensory bitterness.
Using HPLC and the picric-acid method, confirmed that leaves of MeCYP79D1 knockout lines showed a decrease in linamarin from 2.72±0.17 g/kg fresh weight in wild type to 0.65±0.03 g/kg fresh weight, and in cyanide yield from 201.0±0.99 mg/kg to 17.44±2.482 mg/kg, both decreasing to about 1/7.
Limitations: The authors explicitly say they did not conduct taste or sensory evaluation. Linamarin and cyanide did not disappear completely. The abstract's summary of about 1/7 does not arithmetically match the reported measurements in the same paper (about an 11.5-fold HCN difference and about a 4.2-fold linamarin difference). Both the abstract wording and the measurements are recorded here as given.
Show dataingredient-bitter-cassava —can_be_debittered_by→ "CRISPR/Cas9 knockout of the MeCYP79D1 gene (exon 3). In leaves, linamarin content fell from 2.72±0.17 g/kg fresh weight in wild type to 0.65±0.03 g/kg fresh weight in the mutant, and cyanide yield from 201.0±0.99 mg/kg to 17.44±2.482 mg/kg; both decreasing to about 1/7."