SOFT RESINS IN SULPHURED AND UNSULPHURED HOPS. 13 
creased in approximately the same proportion as the acid values 
diminished. This 
decrease in the acid Fal gk wirbiaee eel 
value and increase 2 
in ester value would 
indicate that ester- 
ification took place 
faster than freeacids 200 
were formed, the a 
original quantity of ier ele teagyd 
free acids being prac-  %~ 
tically used up. In 
other words, the sul- 
phuring of hops ap- 
pears to hasten the SS / 
formation of esters 60) OLE = 
in the soft resins but . 
retards the forma- 
tion of free acids. 
The acid value of 5a 
the soft resins from 4 
the sulphured hops RAC SCR ASE 
in both cold and Open. Fic. 4.—Ester-value curves of the soft resins in sulphured and unsul- 
: phured hops in cold and in open storage. 
storage gradually in- 
creased during the period of storage, and the corresponding ester value 
likewise gradually 
increased, indicating 
that in the unsul- 
ty 290 a6 ie | phured hops the for- 
WN 
\ 
S 
SS 
\ 
S 
»d 
vi 
e b 1% 
: 

LSTLER VALUWE 
“XN 
L 
“iL 
No 
& 
~~ 
i. 
\S 
3 
y 
1 
+ 
\ 
| 
Ree | 
| 
\ 


WA' 

w il 

. mation of free acids 
S d of «th - 
> and of the corre 
S sponding esters goes 
N on with regularity. 
NS 
s SAPONIFICATION VALUE. 
§ 
The saponification 
value, shown in Ta- 
ble X and indicated 
graphically in figure 
5, was in this study 
4 determined before 
the ester value, al- 
Fic. 5.—Saponification-value curves of the soft resins in sulphured and though it; is usu ally 
unsulphured hops in cold and in open storage. : : 
obtained by adding 
the acid and ester values of the product under investigation. From 

Zi = 
YEARS IN STORAGE 
\ 
