Part III.] Gopal Rau and Simonsen : Oils and Fats from seeds. 
Experimental. 
The seeds were found to consist of 25 per cent, of shells 
and 75 per cent, of kernels and the latter yielded, on expression io 
the cold in a hydraulic press, 34 per cent, of a deep orange coloured 
oil which had a strong resinous smell. The constants of the oil are 
given in the above table. 
Free acids. 
A quantity of the oil was shaken with a cold dilute solution of 
sodium hydroxide until no further acid was removed ; the alkaline 
solution was washed with ether to remove traces of adherent oil and 
acidified with dilute sulphuric acid when a resinous brown liquid was 
obtained. (Yield 19 per cent.) 
The crude acid was found to have an equivalent of 393'7, iodine 
value 87'3 and titre test 18’5. For the determination of the resin 
acids present the following method was adopted (c.f. Dieterich 
Analysis of Resins p. 99). The acid (0‘9463 gramme) was neutralised 
with alcoholic potassium hydroxide solution, the solution made up 
to lOOcc. by the addition of ether and finely divided silver nitrate 
(1’5 gramme) was added. On thoroughly shaking the solution the 
silver salts of the fatty acids were precipitated leaving the resin 
acids in solution in the ether. After filtration the clear ethereal 
solution (50cc.) was shaken with excess of hydrochloric acid, filtered 
dried and evaporated when the residue consisting of the resin acids 
and a little oleic acid was found to weigh 0‘2431 gramme. After 
correcting for the oleic acid present the percentage of resin acids 
in the free acids was found to be 50‘2 per cent. 
For the identification of the fatty acids present a quantity of the 
crude acids was converted into the lead salt and the portion of the lead 
salt soluble in ether was decompsoed and the recovered acid distilled im- 
der diminished pressure (100mm.) when the main fraction passed over 
at 276-280° leaving a considerable residue in the flask. The mixture of 
acids thus obtained had an iodine Value of 119. A portion of the acid 
(10 grammes) was dissolved in chloroform and treated with bromine in the 
usual manner, the mixture of bromo acids thus obtained being tritu- 
rated with cold light petroleum, when a small quantity of a 
sparingly soluble acid remained. This was recrystallised from light 
petroleum when it was found to melt at 114° and was identified as 
tetrabromolinolic acid. 
Owing to the small quantity of material available it was not possible 
to separate the oleic acid which was undoubtedly also present in a pure 
state, whilst linolenic acid was absent. 
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