. Bulletin of the Department of Agriculture. Agriculture; Agriculture. creased in approximately the same proportion as the acid values diminished. This decrease in the acid value and increase in ester value would indicate that ester- ification took place faster than free acids were formed, the original quantity of free acids being prac- tically used up. In other words, the sul- phuring of hops ap- pears to hasten the formation of esters in the soft resins but retards the forma- tion of free acids. The acid value of the soft resins from the sulphured hops in both cold and open storage grad
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. creased in approximately the same proportion as the acid values diminished. This decrease in the acid value and increase in ester value would indicate that ester- ification took place faster than free acids were formed, the original quantity of free acids being prac- tically used up. In other words, the sul- phuring of hops ap- pears to hasten the formation of esters in the soft resins but retards the forma- tion of free acids. The acid value of the soft resins from the sulphured hops in both cold and open storage gradually in- creased during the period of storage, and the corresponding ester value likewise gradually ~^$ increased, indicating that hi the unsul- phured hops the for- mation of free acids and of the corre- sponding esters goes on with regularity. SAPONIFICATION VALUE. The saponification value, shown in Ta- ble X an d indicated graphically in figure 5, was in this study determined before the ester value, al- though it is usually obtained by adding the acid and ester values of the product under investigation. From y£>t/?s //v sToa^Gf Fig. 4.—Ester-value curves of the soft resins in sulphured and unsul- phured hops in cold and in open *S£V*W Mt STO&46£ Fig. 5.—Saponifieation-value curves of the soft resins in sulphured and unsulphured hops in cold and in open Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
Size: 1717px × 1455px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
