EFFECT OF ALKALI TEEA.TMENT OX COCOAS. 



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creased the total water-soluble matter and the water-soluble matter 

 minus the ash, but the nonnitrogenous, nonash soluble matter did 

 not vary. Of course, the increase in total amount of alkali increased 

 the ash constants throughout. The greatest difference shown by 

 these two treatments is the large increase in the color value of the 

 solution by the use of the mixed carbonates. As will be shown later, 

 this large increase in color is due principally to the action of the sodium 

 carbonate. 



Table 7. — Comparison of water-soluble mailer in treated and untreated cocoas. 





Water-soluble matter. 





Ash of water-soluble matter. 





Water-soluble 

 protein 



Color 























(Nx 



6.25). 



value 

 4 per 



No. 



Total. 



Ash- 

 free. 



Ash- 

 and 

 protein- 

 free. 



Total. 



Water- 

 solu- 

 ble. 



Water- 

 insolu- 

 ble. 



Alkalinity (N/10 acid 

 per gram of cocoa). 



Total. 



Insolu- 

 ble in 

 1 per 

 cent 

 sul- 

 phuric 

 acid. 



cent so- 

 lution 

 (J-inch 

 cell, 





Water- 

 solu- 

 ble. 



Water- 

 insolu- 

 ble. 



Total. 



brew- 

 er's 

 scale). 



2 

 1 



P.ct. 



29.59 

 28.29 



Per ct. 

 22.61 

 21.17 



Per ct. 

 10.36 

 10.78 



Perct. 

 6.98 

 7.12 



Per ct. 

 4.79 

 4.59 



Per ct. 

 2.19 

 2.53 



Cc. 



4.45 



2.00 



Cc. 



3.40 



3.85 



Cc. 



7.85 



5.85 



Per ct. 

 12.25 

 10.39 



Per ct. 

 3.25 



.81 



Degrees. 

 53.4 

 36.8 



15 

 11 



37.02 

 31.10 



27.22 

 22.17 



15.53 

 10.83 



9.80 

 8.93 



9.00 

 7.88 



.80 

 1.05 



8.00 

 6.90 



2.10 

 2.40 



10.10 

 9.30 



11.29 

 11.34 



.79 

 2.30 



70.0 

 59.9 



16 

 12 



36.00 

 31.27 



25.26 

 23.67 



12.26 

 12.31 



10.74 

 8.60 



8.77 

 7.63 



1.97 

 97 



10.45 



6.75 



2.40 

 2.90 



12.85 

 9.65 



13.00 

 11.36 



3.54 



2.67 



93.6 

 43.3 



22 

 23 



32.65 

 32.33 



24.06 

 24.77 



13.80 

 15.26 



8.59 

 7.56 



6.83 

 3.89 



1.76 

 3.67 



5.35 

 2.80 



3.75 



4.70 



9.10 

 7.50 



10.26 

 9.51 



.94 



.00 



67.3 

 39.3 



20 

 19 



36.72 

 33.14 



28.93 

 26.79 



17.27 

 14.43 



7.79 

 6. 35 



7.14 

 3.54 



.62 

 2.81 



10.25 

 2.95 



2.10 

 4.65 



12.35 



7.60 



11.66 

 12.25 



3.15 

 .00 



98.4 

 30.6 



26 

 25 



33.42 

 32.55 



28.22 

 26.18 



15.16 

 15.16 



5.20 

 6.37 



4.10 

 3.55 



1.10 



2.82 



2.50 

 2.35 



3.15 



4.45 



5.65 

 6.80 



13.06 

 11.03 



1.77 

 .00 



6S.0 

 31.5 



28 

 29 



33.50 

 31.84 



25.89 

 26.15 



12.86 

 13.43 



7.61 

 5.69 



6.53 

 3.91 



1.08 

 1.78 



5.00 

 3.50 



3.04 

 3.75 



8.05 

 7.25 



13.03 

 12.72 



2.32 

 1.96 



81. S 

 50.6 



31 



30 



34.35 

 33.90 



26.80 

 26.96 



14.39 

 14.79 



7.55 

 6.94 



6.37 

 4.79 



1.18 

 2.15 



10.30 

 5.15 



2.25 

 3.30 



12.55 



8.45 



12.41 

 12.17 



3.55 

 .00 



76.2 

 29.2 



33 

 32 



31.26 

 32.68 



24.76 

 26.93 



13.76 

 16.60 



6.50 

 5.75 



5.12 

 4.02 



1.38 

 1.73 



6.80 

 3.50 



2.00 

 3.35 



8.80 

 6.85 



11.00 

 10.33 



1.21 



.00 



SI. 4 

 31.3 



46 

 44 



28.82 

 30.54 



23.80 

 24.12 



12.30 

 14.11 



5.02 

 6.42 



3.79 

 3.55 



1.23 



2.87 



3.95 

 2.30 



3.45 

 4.50 



7.40 

 6.80 



11.50 

 10.01 



2.19 

 .00 



46.4 

 27.2 



Sample 22 was treated with 1 per cent potassium carbonate and 

 shows a slightly increased total soluble matter, but less ash-free solu- 

 ble matter and protein- and ash-free soluble matter. The alkali 

 treatment shows an increase in the color value and the expected 

 increase in the ash constants. Sample 20, treated with 2.5 per cent 

 sodium carbonate, shows an increase in the soluble solids throughout 

 and in the color value. Sample 26, treated with 4 per cent ammonium 

 carbonate, shows a slight increase in the amount of soluble matter 

 and in the color value of the solution. Sample 28, treated with 1 per 

 cent sodium carbonate, shows a larger percentage of total soluble 

 solids, but a smaller percentage of ash-free and protein- and ash-free 



