


SOFT RESINS IN SULPHURED AND UNSULPHURED HOPS. 5 
TasieE I.— Moisture in the original samples of sulphured and unsulphured hops and in 
samples kept wn cold and in open storage. 
| 
ee. Cold storage. Open storage. 
Original 
Treatment at the kiln. sample, 
tou 1912 1913 1914 1912 1913 | 1914 


Per cent. | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. 
Sulpmumedeeecec seks 6.18 11.04 11.04 9.83 5.81 6. 37 6. 40 
Wnsulphmnede er. ee see 5. 23 10.50 10. 79 10. 90 6.14 5.90 | 5. £0 



From Table I it is evident that the moisture content of the hops 
kept in cold storage was greater than of those in open storage. In 
the samples kept in cold storage the moisture content was very 
uniform for the three years in both the sulphured and the unsul- 
phured hops, indicating that the cold-storege room was kept at a 
uniform temperature throughout this period. In the open-storage 
samples a shght fluctuation in the moisture content was evident, due 
apparently to differences in the atmospheric conditions at the time 
the samples were removed for analysis. Since moisture is an impor- 
tant adjunct to a great many chemical changes, it is probable that 
the greater quantity found in the samples kept in cold storage had a 
direct bearing on the chemical changes that took place in the soft 
resins. 
SOFT RESINS. 
In determining the quantity of soft resins in the hop samples, a 
departure was made from the method usually employed. A kilo- 
gram of hops was extracted by maceration and percolation with 
petroleum ether (B. P. 35° C. to 70° C.). Two macerations were 
necessary to complete the extraction. The mixed percolates were 
then heated on a water bath at 70° C. and the major portion of the 
petroleum ether recovered. The remainder of the petroleum ether 
was allowed to evaporate spontaneously and the weight of the residue 
returned as soft resins. The residues each contained a small fraction 
of approximately 0.4 per cent of wax, which for purposes of com- 
parison may be disregarded. The percentage of soft resins in the 
original sulphured and unsulphured samples and in the corresponding 
samples in cold and in open storage is shown jn Table II. 
TaBLe II.—Soft resins in the original samples of sulphured and unsulphured hops and 
in samples kept in cold and in open storage. 
fie Cold storage. | Open storage. 
Original 
Treatment at the kiln. sample, 
1911. 

| | 
1912 1913 1914 | 1912 | 1913 1914 
= —<—<—$<—<—————$—__|_————— | 



| Per cent. | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. 
Sulphured Eyes SRR Ir pe entre | 12. 32 11.91 11. 46 4.98 | 1325 9.03 3. 20 
Wimsuipitured 6.0 £525..0) 202222 Peete tae 9.72 8. 66 S280 8.73 | 7.43 2. 32 
| | | 


