1134 Wisconsin Academy of Sciences, Arts, and Letters. 
Table 137 —Iodine values of oleoresins prepared in the laboratory. 
Sample 
No. 
1 
2 
3 
4 
Date 
Observer 
Solvent 
Iodine value 
1916 
Dn Me/... 
Alcohol.................... 
90.0 
88.6 
95.4 
109.5 
Acetone ................... 
.4 
Ether...................... 
“ 
Petrol.-ether.............. 
Table 138 — Iodine values of commercial oleoresins. 
Sample 
No. 
Date 
Observer 
Secure© - 
Iodine value 
1 
2 
1916 
DuMez.. 
Sharp & Dohme.... 
Squibb & Sons... .. 
83.7 
89.9 (a) 
(a) Contained ether. 
Special Quantitative Tests. 
At the present time, there does not appear to be a method in 
use for the evaluation of this oleoresin. As its therapeutic 
properties are due, in greater part at least, to its pipeline con¬ 
tent, 1 a quantitative method for the estimation of this con¬ 
stituent appears to offer the best means of determining its 
quality. 
Method for the Estimation of the Piperine Content. 
In the laboratory, the amount of piperine present was com¬ 
puted from the nitrogen content of the oleoresin, the latter 
being determined by the Gunning-Arnold 2 method. The re¬ 
sults obtained are given in the following tables: 
Table 139 —Piperine content of oleoresins prepared in the laboratory. 
Sample 
No. 
Date 
Observer 
Solvent 
Piperine 
content 
1. ........ 
1916 
DuMez....... 
Alcohol.................... 
Per cent. 
47.0 
2 ..... _ 
Acetone ........... ....... 
54.3 
51.3 
3......... 
•* 
“ 
Ether...................... 
4. 
«« 
“ 
Petrol, ether .............. 
15.1 
1 See "under “Constituents of therapeutic importance.” 
8 Bull. No. 107, Bur. of Chem. (1912), p. 162. 
