Du Mez—-The Galenical Oleoresins. 
r 
1033 
Chemical Properties. 
Loss in weight on heating: Determinations made in the 
laboratory show that the oleoresin loses but little in weight on 
heating at 110 °C, a loss of but 0.42 to 2.13 per cent, having 
been observed for the preparation when free from solvent. The 
laboratory preparations as a rule showed a smaller loss than 
the commercial samples, which is very likely due to a difference 
in the temperature conditions under which the preparations 
were made. The results obtained in the determinations made 
in the laboratory are given in the following tables: 
Table 37 —Laboratory preparation*—loss in weight on heating 
Sample 
No. 
Date 
Observer 
Solvent 
Per cent, of 
loss on 
heating 
1 . 
1.916 
DuMez . 
Alcohol. 
At 110° C 
0.42 
2 .. ...... 
Acetone.. 
0.52 
3. 
•• 
** 
Ether. 
0.88 
4 . 
“ 
“ 
Petrol, ether. 
0.68 
5.. 
Alcohol. 
5.15* 
0.74 
6 . 
“ 
“ 
Acetone. 
7......... 
“ 
*• 
Ether.. 
2.09 
8. 
Benzine. 
1.01 
1 Contained alcohol. 
Table 38. — Commercial oleoresins — loss in weight on heating. 
Sample 
No. 
Date 
Observer 
Source 
Per cent of 
loss on 
heating 
1 . 
1916 
DuMez .. 
Sharp & Dohme. . 
At 110° C 
1.93 
2.13 
4.09 J 
2 . 
Lilly & Co. 
8 . 
*• 
“ 
Souibb & Sons. 
1 Contained ether. 
Ash Content: The determinations made in the laboratory 
show that the ash content of the oleoresin varies with the solvent 
employed in its preparation. When acetone was the solvent 
used, the amount of ash obtained did not exceed 0.26 per cent, 
whereas, the amount was only 0.09 to 0.12 per cent, when the 
oleoresin was prepared with ether. The variable results ob¬ 
tained in the examination of the commercial samples appear to 
