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TABLE 98.-Somogyi 1 dextrose-thiosulfate equivalents

[Amounts of dextrose corresponding to titration values when 5 ml of solution and 5 ml of copper reagent (modified) are heated in a water bath for 15 minutes]

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1 M. Somogyi, J. Biol. Chem. 70, 607 (1926). 1 ml of 0.005 N thiosulfate equals 0.318 mg of copper.

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.355 .352 .350

.348

.331 .329 .327

.325

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p

0.0 0.385 0.382 0. 379 0.376 0. 373 0.370 0. 367 0.364

01234

56788

.343 .341 .338

.318.316

0.361 0.358 . 336.333 .314 .312 . 294.292 . 274.272

236.234

217.215

.345

.323

.321

. 302

.300

.298 .296

. 282

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.206

[blocks in formation]

. 188

.186

[blocks in formation]
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TABLE 100.-Pot method of Main for invert sugar

[Using Fehling solution, Soxhlet modification; time of heating in boiling water, 5 min.; indicator, 2 drops of 1-percent methylene blue in each tube]

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1

TABLE 101.-Pot method of Main for small quantities of invert sugar 1 [Using a Fehling solution containing potassium ferrocyanide; indicator, 2 drops of 1-percent methylene blue in each tube]

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0.832 0. 384 0. 182 0. 0878 0. 0390 0. 0265 0. 0106 0. 0085 . 356. 170.0828.0381 .0251.0095.007 1

. 338.161.0783.0368 .0229.0086.0060 153.0739.0348. 0208.0079.0052

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g

[ocr errors]

%

%

[subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][ocr errors][subsumed][subsumed]

.779

17

740
704

.324

.670

. 0697. 0323 .0191.0074 .0045

638 .608

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581 .556

. 270. 128

24

533

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35 .370

Int. Sugar J. 34, 213 (1932).

.232.113.0530. 0226.0139.0052

.222 . 109

. 215. 105

209.101

. 0510.0216.0133.0050.0020

. 0491 0207 .0128.0047

. 0473. 0198 0123 0045 0015

. 0455 0190.0119.0043

0438.0182

0114 0041 0010

. 0408 . 0168 .0105
.0393. 0162 .0101

. 181.080.0380.0156. 0097

. 178.0765.0369 .0151.0094

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TABLE 102.-Sichert and Bleyer modification of the Barfoed copper acetate method for hexoses i

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The table may be interpolated for hundredths of a milliliter, but should not be extrapolated.

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