Óleo de níger
Nome INCI: Guizotia Abyssinica Seed Oil. Também: Óleo de semente de níger.
Valores publicados
| Índice de saponificação | 188–193 mg KOH/g |
| Usado pela calculadora | 190,5 mg KOH/g (ponto médio) |
| SAP para NaOH | 0,1358 g/g |
| Índice de iodo | 110–135 g I₂/100 g |
| INS (SAP − índice de iodo) | 68 |
| Ponto de fusão | — |
| Matéria insaponificável | ≤ 1 % |
Uma barra 100 % óleo de níger
Qualidades convencionais somadas a partir dos grupos de ácidos graxos; uma barra de um só óleo é um ponto de referência, não uma receita.
Perfil de ácidos graxos
| Ácido graxo | Intervalo publicado, % | Usado | |
|---|---|---|---|
| Ácido mirístico | C14:0 · saturados | 0,049–0,07 | 0,1 |
| Ácido palmítico | C16:0 · saturados | 10,317–10,662 | 10,5 |
| Ácido palmitoleico | C16:1 | 0,106–0,155 | 0,1 |
| Ácido esteárico | C18:0 · saturados | 7,59–8,761 | 8,2 |
| Ácido oleico | C18:1 | 5,867–11,479 | 8,7 |
| Ácido linoleico | C18:2 | 67,302–74,669 | 71,0 |
| Ácido araquídico | C20:0 · saturados | 0,427–0,532 | 0,5 |
| Ácido behênico | C22:0 · saturados | 0,577–0,682 | 0,6 |
| Ácido lignocérico | C24:0 · saturados | 0,273–0,399 | 0,3 |
De onde vêm estes números
As notas com fonte abaixo, e os títulos dos documentos que elas citam, são mantidos no idioma original. Uma citação traduzida não pode ser localizada, e um resumo técnico traduzido não é mais o resumo que foi conferido com o documento.
Section 2.4 (extraction, derivatisation, GC-MS); Table 1 relative percentages of the identified fatty acids in the five zones.
Page 15: saponification value 188-193, iodine value 110 to 135, unsaponifiable matter not more than 1.0 %, acid value not more than 6.0. Read from the rendered page.
Quoted in notes (location effect).
Quoted in notes as corroboration; the second accession is at https://fatplants.net/plantfadb/datasets?plant_id=11865.
Fatty acids are Table 1 of Makuria et al. 2025 (PLoS ONE 20(1):e0317397, open access): niger seed from five producing zones of Ethiopia (West Wolega, East Wolega, Horo Guduru Wolega, North Gondar, East Gojjam), lipids extracted with chloroform-methanol, FAMEs by GC-MS, mean relative % (n = 2): myristic 0.049-0.070, C16:1 (7-hexadecenoic, n-9) 0.106-0.155, palmitic 10.317-10.662, linoleic 67.302-74.669, oleic 5.438-11.017 plus cis-vaccenic 0.429-0.465 (stored per zone as total C18:1, 5.867-11.479), stearic 7.59-8.761, arachidic 0.427-0.532, behenic 0.577-0.682, lignoceric 0.273-0.399 %. The C16:1 is the n-9 isomer, filed under the schema's single C16:1 key. A COPYING SLIP IN THE TABLE: the North Gondar column prints arachidic 0.064, behenic 0.0176 and lignoceric 0.155, which are exactly that column's myristic, 12-methyltetradecanoic and C16:1 values repeated, so those three are left out of the ranges. Two minor constituents have no key: 12-methyltetradecanoic acid (0.015-0.024 %) and '17-octadecynoic acid' (0.0304 and 0.073 % in two zones). Each zone sums to about 99-100 %. SAPONIFICATION VALUE, IODINE VALUE AND UNSAPONIFIABLE MATTER are the Indian regulatory standard for niger seed oil (FSSAI, Food Safety and Standards (Food Products Standards and Food Additives) Regulations 2011, Chapter 2.2, item 2.2.1(13), Version 5 of 1 August 2025, page 15): saponification value 188-193, iodine value 110 to 135, unsaponifiable matter not more than 1.0 %, acid value not more than 6.0, refractive index 1.4665-1.4691 at 40 C (butyro-refractometer 61.0-65.0). The recorded composition implies about 192 mg KOH/g and an iodine value near 131, inside the standard. Corroboration from PlantFAdb: two G. abyssinica accessions ('d libanos' and 'esete') in 'Oil content and fatty acid composition of seeds of Guizotia Cass. (Compositae)' (1997; #11880, #11883), palmitic 9.7-10.0, stearic 7.7-8.0, oleic 5.4-7.0, linoleic 65.7-68.7 %, arachidic 0.5, behenic 0.7-0.8, lignoceric 0.5, erucic 0.4-0.5 %. GROWING LOCATION CAN CHANGE THIS OIL COMPLETELY: 'Effect of location on the fatty acid composition of niger seed oil' (1994, India; #14498, #14499) found 76.7 % linoleic and 7.8 % oleic at Chintapalli but 40.5 % linoleic and 44.5 % oleic at Raichur. FOR SOAP: in its usual form a sunflower-like linoleic oil (67-75 %) with a little more stearic, so soft and quick to oxidise; a high-oleic lot would behave very differently, which is a reason to ask for the certificate. INCI 'Guizotia Abyssinica Seed Oil' is an active CosIng entry without CAS or EC numbers.
Este registro faz parte do banco de dados aberto de ingredientes (ODbL). Encontrou um erro ou uma fonte primária melhor? O conjunto de dados está no GitHub; correções com link para um documento são bem-vindas.