The authors investigated the characteristics of three kinds of oils entitled above.
A. Peach oil
Peach fruit seed was extracted with ether to obtain sample of the oil, of which the characteristics of mixed acid, solid and liquid acids separated therefrom were as follows :
Sample oil Mixed acid Solid acid Liquid acid
Yield, percent 16.47 94.0 40.41 59.59
d154 0.9012 - - 0.9118
n20D 1.4610 - - 1.4657
A.V. 110.2 - - -
S.V. 183.8 - - -
N.V. - 201.4 202.8 200.2
I.V. (Wijs) 105.5 104.0 74.2 123.1
mp °C - 29.831.2 - -
Unsaponifiable matter (%) 2.50 - - -
Color Yellowish red Yellow Pale yellow Yellowish red
Solid acid contained chiefly C
18, C
16 and little amount of C
10, C
12 acids (C
18-F
1-elaidic acid was also confirmed).
Liquid acid contained chiefly C
16, C
18 and little amount of C
12 acid.
B. Polygonum japonicum oil
Polygonum japonicum seed was extracted with ether to obtain sample of the oil, of which the characteristics of mixed acid, solid and liquid acids separated therefrom were as follows :
Oil Mixed acid Solid acid Liquid acid
Yield, percent 2.70 87.80 17.42 82.58
d154 0.9273 - - -
n20D 1.4741 - - 1.4733
A.V. 33.4 - -
S.V. 184.4 N.V. 210.9 N.V. 211.7 N.V. 210.8
I.V. 126.8 130.8 39.2 141.9
Unsaponifiable matter (%) 5.85 - - -
Color Dark yellow Yellowish brown
Pale yellow Brown
The solid acid contained chiefly C
18, C
16 and little amount of C
14, C
12 acids. The liquid acid contained chiefly C
16, C
18 and little amount of C
12, C
14 acids.
C. Cowpea oil
Cowpea seed was extracted with ether to obtain sample of the oil, of which the characteristics of mixed acid, solid and liquid acids separated therefrom were as follows :
Oil Mixed acid Solid acid Liquid acid
Yield, percent 0.56 81.53 63.87 36.14
d154 0.9331 - - -
n20D 1.4733 - - -
A.V. 5.9 - - -
S.V. 187.6 N.V. 205.5 N.V. 208.2 N.V. 199.5
I.V. 129.7 126.1 76.3 179.8
Unsaponifiable matter (%) 7.64 - - -
Color Yellowish green Yellowish brown Pale yellow Dark red
The solid acid contained chiefly C
16, C
18 acids and little amount of C
14. The solid acid which is insoluble in petroleum ether was found in the mixed fatty acids. The liquid acid contained chiefly C
16, C
18 and little amount of C
12, C
14 acids.
The unsaponifiable matter had the following properties :
Sample mp °C I.V. Color
A 121124 127.6 Yellow
B 113119 - Yellowish red
C 135144 126.4 Yellowish white
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