‘ 
166 Quisumbing: Determination of Glucose and Starch 591 
of oxidation of glucose, using 0.1 N alkaline potassium perman- 
ganate solution. The total number of cubic centimeters of 0.1 
N potassium permanganate used for oxidation was obtained by 
heating the alkaline potassium permanganate mixtures of the 
same composition to different temperatures, and for different 
lengths of time after 95° C. had been reached. The results are 
given in Tables 2, 3, and 4. 
peratures rising from 29° to 95° C. in four minutes. 
[For final volume of mixture of 60 cubic centimeters.] 
# TABLE 2.—Glucose oxidation by potassium permanganate at various tem- 
| | 
Tim Biv | 
Observation. apr enag < iam Pn 
ganate. 
°C. |Min. sec. ce. Per cent. 
| Pee Seo Recta Vane ote ee Eire Cy Ip clne A URaNee SIE cra SNe ak 60 1 386 6. 53 49.69 
Pes es ig et eee a ee he 70 = & 7. 50 56. 82 
ae ct See a eee 80 2 48 9. 05 68.56 
eee ey ee eo ee ee ey 90 4 3 10.57 80. 07 
a es ge ee ee eee ae nee 95 4 41 10.59 80. 02 
Dis Set hi ae Gee ee oe ne Coie oe ee aes Be a a30 10. 80 81.81 
Pica ek rie ce ere ee eee eee eR ee a #60 11.12 84. 50 
ae ae ee ah yan ee Pe a 290 11.18 84.70 
RS he eR eS aie eee ee oe 2120 11.47 86. 96 
s 2 BRP are age Se er aeRO, Woe nar ahs Meme ereene See ee, ene eee 3150 11.45 86.96 
es ee ee ee ae ee ee ke Bo ee 2180 11.50 87.01 
8Length of time after 95° C. had been reached. 
TABLE 3.—Glucose oxidation by potassium permanganate at various tem- 
peratures rising from 29° to 95° C. in two minutes. 
{For final volume of mixture of 60 cubic centimeters. ] 
-—— 
— 0.1N 
Observation. bese of ilesa pe — 
heating. | manga- . 
nate. 
°c. Min. sec. ce. Per cent. 
1 SSAA Oates ie ee ace a Oe Le ae 60} 0 45 5.60 | 42.42 
Meee ee a ns eee er Se 70; 1 00 6.15 46.50 
, SEGRE NOs eel SY pee eee MolgOe s ee ay Coe oe ee Ming 6 6.70 | 650.76 
a ee ee ee ee 90) 1 45 8.30} 62.87 
ERIE RAEN SOREN gitar egal Sets Sa mee Races 9] 2 00 9.10! 68.94 
5 ES pect ae ame Pose ee Ede et A a eae ee PeNeingea 0 230 10.25 | 77.65 
<P) bg eal rs Te aS URE SON ee ene a oe Teak: MORE Beet 0 260 10.77 | 81.60 
ION GRR SOLED FETE CODE Soe ay Or Aer aan nue ane Beemer ee 0 390 11.10} 84.10 
We a ee eee ae 0 2120 11.23} 85.10 
fees Soke ik ies See ee ee 0 8150 11.45 | 86.72 
Ces ee ee 0 9180; 11.52] 87.04 
® Length of time after 95° C. had been reached. 
