1G 



BULLETIN GG6, U. S. DEPARTMENT OF AGRICULTURE. 



As has boon noted, the water-soluble mattor of the alkali-treated 

 cocoas has present a protein which is insoluble in 1 per cent sul- 

 phuric acid. This varies from 1.15 to 18.20 per cent of the solid 

 matter. The greatest variation, however, is shown in the nonash, 

 nonprotein matter, which varies from 39.87 to 57.96 per cent, with 

 an average of 45.83 per cent, on the untreated cocoas, and from 23.59 

 to 4S.22 per cent, with an average of 40.64 per cent, on the treated 

 cocoas. Eleven samples of treated cocoas contain a smaller per- 

 centage of ash- and protein-free extract than the minimum of the 

 untreated cocoa. This shows still more plainly what was shown in 

 tho analysis of the cocoas, namely, that the alkali treatment inhibits 

 the solution of this nitrogen-free extract. On the other hand, the 

 alkali treatment unquestionably increases, to a slight extent, the 

 solubility of the protein. 



ASH RATIOS IN UNTREATED AND TREATED COCOAS. 



The ratio of the water-soluble ash to the water-insoluble ash was 



calculated on both the original cocoa and on the water-soluble matter; 



also, the ratio of the alkalinities of the soluble and insoluble ash was 



calculated on each of these. These results are listed in Tables 10 



and 11. 



Table 10. — Ash ratios on untreated cocoas. 



No. 



Water-soluble ash 

 Water-insoluble ash 



Alkalinity water- 

 soluble ash 

 Alkalinity water- 

 insoluble ash 



No. 



Water-soluble ash 

 Water-insoluble ash 



Alkalinity water- 

 soluble ash 

 Alkalinity water- 

 insoluble ash 





Cocoa. 



Water- 

 soluble 

 matter. 



Cocoa. 



Water- 

 soluble 

 matter. 



Cocoji. 



Water- 

 soluble 

 matter. 



Cocoa. 



Water- 

 soluble 



matter. 



19.... 



0.55 

 .70 

 .56 

 .71 

 .65 

 .60 

 .49 

 .51 

 .28 

 .(12 

 .62 

 .45 

 .38 

 .50 

 . 15 

 .39 



1.26 



1.06 



1.25 



2.31 



1.81 



.95 



.55 



.93 



1. 03 



.87 



1.24 



1.02 



1.08 



.80 



.68 



1. is 



0.61 

 .19 

 .47 



.52 

 .44 

 .46 

 .42 

 .34 

 .48 

 .44 

 .41 

 .44 

 .39 

 .43 

 .39 

 .36 



0.63 

 .61 

 .52 



1.04 

 .36 

 .44 

 .48 

 .51 

 .53 

 .49 

 .51 

 .19 

 .00 

 .50 

 .46 

 .67 



55 



0.45 

 .19 

 .38 

 .39 



2.2S 

 1.43 

 1.88 

 1.19 



0.4« 



.48 

 .39 

 .46 



0.72 



23.... 



50 





25.... 



57 





32 



58 



.59 



36.... 

 39.... 

 40.... 

 41.... 

 42. . . . 

 43.... 



Maximum. 

 Minimum.. 



Avcragt' 



1 





.71 

 .28 

 .51 



2.31 

 .55 

 1.24 



.61 

 .34 

 .41 



1.04 

 .36 

 .59 



1.09 

 1.33 

 1. 11 

 1.23 

 3.16 

 1.26 

 .24 



1.82 

 3.46 

 1.46 

 2.23 

 4.70 

 2.45 

 3. 25 



.65 

 .93 

 .73 

 .77 

 1.38 

 .71 

 .19 



.53 



44 ... . 



13 



1.66 



45.... 



29 



.93 



47.... 



30 



1.54 



48... 



3 



2.43 



51 ... . 



14... 



1.22 



54.... 



27 



1.21 









Except on those samples which were treated with magnesium or 

 ammonium carbonate, the soluble ash is invariably greater than the 

 insoluble ash on the treated cocoas, the lowest figure (with the 

 exceptions noted) being 0.81 and the average figure 1.88. With the 

 exception of samples 1, 13, 29, and 30, which have been excluded 

 from the general averages throughout on the ground of having been 

 contaminated with more or less alkali-treated cocoa, the correspond- 



