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EC number: 232-304-6
CAS number: 8002-26-4
A complex combination of tall oil rosin and fatty acids derived from acidulation of crude tall oil soap and including that which is further refined. Contains at least 10% rosin.
The value of pKa indicates that in the range
of pH usually considered relevant to the human body and environment,
i.e. pH 2-9, the fatty and resin acids constituents of the substance
will ionised. However, the neutrals constituents will tend not to
ionised at the relevant environmental pH. The table below gives pKa
values for the acids.
Distilled Tall Oil acid constituents
LOW BOILING FATTY ACIDS (<C16)
C16:1 FATTY ACID
PALMITIC ACID - (C16 SATURATED)
C17:0 and C17:0 BRANCHED ACIDS
OLEIC ACID - (cis - C18:1) and isomers
ELADIC ACID - (trans - C18:1)
LINOLEIC ACID (c9,c12)
CONJ. LINOLEIC ACIDS (18:2)
PINOLENIC ACID - (C18:3, cis-5,9,12)
LINOLENIC ACID - (C18:3, c9,c12,c15)
STEARIC ACID - (C18:0)
EICOSANONIC ACID-(C20 SATURATED)
EICOSENOIC ACID - (C20:1)
EICOSADIENOIC ACID - (C20:2)
EICOSATRIENOIC ACID - (C20:3 FA)
Unknown fatty acids
8,15 ISOPIMARIC ACID/C22 FATTY ACID
ABIETIC ACID and isomers
Decarboxylated Rosin acids, MW of 256/258
PALUSTRIC ACID/C24 FATTY ACID
PIMARIC and/or 8,15-PIMARIC ACID
The pKa of the acids ionisable constituents of Distilled Tall Oil is predicted using a reliable freely-available method.
No measured data for dissociation constant
of Distilled Tall Oil were available. The pKa value (normal conditions)
was predicted using SPARC.
While the acids constituents (Fatty and
Resin acids) group is ionisable, neutrals constituents such as alcohols
are extremely weak acids and only dissociate under strongly basic
conditions. In the range of pH usually considered relevant to the human
body and environment, i.e. pH 2-9, acid constituents will ionise while
the neutrals will be non-ionised. There is no need to conduct further
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