Ácido erúcico
Nome INCI: Erucic Acid. Também: Ácido cis-13-docosenoico.
Valores publicados
| Índice de saponificação | não publicado |
| Índice de iodo | — |
| INS (SAP − índice de iodo) | — |
| Ponto de fusão | — |
| Matéria insaponificável | — |
Uma barra 100 % ácido erúcico
As qualidades do sabão derivam do perfil de ácidos graxos, que está mais abaixo. Aqui elas só aparecem para os registros que a calculadora pode usar.
Perfil de ácidos graxos
| Ácido graxo | Intervalo publicado, % | Usado | |
|---|---|---|---|
| Ácido erúcico | C22:1 | ≥ 88 | 88,0 |
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.
Specifications table on the product page: Appearance (Color) white to pale yellow; Form fused solid, clear as melt; Assay (Silylated GC) > 88.0%. Header: CAS 112-86-7, C22H42O2, 338.576 g/mol. No acid, saponification or iodine value and no melting point in the specification table. The page was saved as HTML and converted to text (scripts removed, tags to line breaks, html.unescape); the same three specification lines also appear in the page's embedded schema.org data. Catalogue number found through PubChem's vendor listing for CID 8216 (13-docosenoic acid).
Product information: purity >99%, storage freezer, supplied neat, physical state solid; identifiers CAS 112-86-7, molecular weight 338.57, lipid number C22:1; synonyms include erucic acid and cis-13-docosenoic acid. No titration values, no melting point. The certificate of analysis is named on the page but not linked.
Checked and not used: 'High erucic rapeseed based hydrogenated fatty acid'; acid value 178 - 190 mgKOH/g, iodine value <= 6 gI2/100g, fatty acid composition C16+C18 <= 50 %(m/m), C20+C22 >= 50 %(m/m). Hydrogenated, so it is not erucic acid. Found by reading every RADIACID page listed in oleon.com/sitemap.xml; none is an erucic acid.
Erucic acid is cis-13-docosenoic acid, C22:1, the characteristic acid of high-erucic rapeseed, mustard and crambe oils. Sold on its own it is a fine chemical rather than an oleochemical cut, and no producer checked for this record publishes a full specification for it: Oleon's RADIACID range has no erucic grade (its high-erucic rapeseed product, RADIACID 0075, is described as a hydrogenated fatty acid, so its erucic acid has been turned into behenic); NOF's English product pages list no fatty-acid grades; the product list in Croda Industrial Specialties' site map has no erucic acid; KLK OLEO's site search returns nothing for it; Kao's product search is script-driven and could not be queried; TCI's page for cis-13-docosenoic acid (D0965) refused the download (HTTP 403). What is published, and what this record holds: Thermo Scientific Chemicals' Erucic acid, tech. 90% (catalogue L08685, formerly Alfa Aesar) specifies Assay (Silylated GC) > 88.0 %, appearance white to pale yellow, form fused solid, clear as melt; CAS 112-86-7, C22H42O2, 338.576 g/mol. That assay is the only composition figure for the technical grade, so the profile is erucic min 88 and nothing else: the balance of up to 12 % is not itemised by the producer and is not guessed at here. Larodan's research-grade 13(Z)-docosenoic acid (product 10-2201) is >99 % pure, molecular weight 338.57, lipid number C22:1, a solid stored in the freezer; it sits inside the same min-88 statement and shows how pure the acid can be bought. No saponification value, acid value or iodine value is published for either grade, so sapKohMgPerG and iodineValue are null, and because the technical grade's profile sums to only 88 % the build will not derive one from it either (it needs 95 %). On the arithmetic, which is arithmetic and not a measurement: a free fatty acid takes one KOH per molecule, so pure erucic acid (M 338.57) is 56106 / 338.57 = 165.7 mg KOH/g, against 56106 / 282.46 = 198.6 for oleic acid, about a sixth less lye per gram; and its one double bond gives a theoretical iodine value of 2 x 126.90 / 338.57 x 100 = 75.0 g I2/100 g. The technical grade's unstated 12 % will move the real lye figure off 165.7 in a direction nobody has published, so for a batch that matters ask the supplier for the lot's acid value. meltingPointC is null: Thermo's specification table gives no melting point and Larodan gives only the physical state. unsaponifiablePercent is null: neither producer publishes it. No source consulted prints an INCI name; the INCI name, CAS and EC numbers are CosIng's entry for Erucic Acid, and CosIng lists no sodium or potassium erucate. In soap, erucic acid is a long monounsaturated chain whose main consequence for a maker is the lower lye demand, the same effect that makes high-erucic rapeseed oil (rapeseed-oil.json) saponify lower than canola.
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.