Circular of the National Bureau of Standards, Issue 440U.S. Government Printing Office, 1942 |
From inside the book
Results 1-5 of 46
Page viii
... Mutarotation___ 232 232 232 232 ( 4 ) Direct polarization at 87 ° C_ 232 ( e ) Invert polarization - tentative - ( 1 ) At 20 ° C. 232 232 ( 2 ) At 87 ° C. ( f ) Reducing sugars . ( g ) Sucrose .. ( h ) Levulose - tentative . Dextrose ...
... Mutarotation___ 232 232 232 232 ( 4 ) Direct polarization at 87 ° C_ 232 ( e ) Invert polarization - tentative - ( 1 ) At 20 ° C. 232 232 ( 2 ) At 87 ° C. ( f ) Reducing sugars . ( g ) Sucrose .. ( h ) Levulose - tentative . Dextrose ...
Page xiii
... Mutarotation of freshly dissolved sugars ( a ) Mutarotation equations .. ( b ) Measurement of mutarotation .. Page 411 411 417 420 424 428 435 437 439 439 441 442 442 446 447 ( c ) Velocity and equilibrium constants for the muta ...
... Mutarotation of freshly dissolved sugars ( a ) Mutarotation equations .. ( b ) Measurement of mutarotation .. Page 411 411 417 420 424 428 435 437 439 439 441 442 442 446 447 ( c ) Velocity and equilibrium constants for the muta ...
Page xviii
... Mutarotation of a - d - galactose . 60. Equilibrium constants calculated from optical - rotation measurements , assuming that only two isomers are present in dynamic equilibrium . 447 61. Thermal mutarotation for sugars exhibiting ...
... Mutarotation of a - d - galactose . 60. Equilibrium constants calculated from optical - rotation measurements , assuming that only two isomers are present in dynamic equilibrium . 447 61. Thermal mutarotation for sugars exhibiting ...
Page xx
... mutarotation of the reducing sugars 762 150. Corrections to be applied to saccharimetric readings of levulose solutions when a constant normal weight is used 766 POLARIMETRY , SACCHARIMETRY , AND THE SUGARS By FREDERICK J. XX Contents.
... mutarotation of the reducing sugars 762 150. Corrections to be applied to saccharimetric readings of levulose solutions when a constant normal weight is used 766 POLARIMETRY , SACCHARIMETRY , AND THE SUGARS By FREDERICK J. XX Contents.
Page 157
... mutarotation , allow sufficient time for its completion . Invert reading . - First determine the quantity of acetic acid neces- sary to render 50 ml of the lead - free filtrate distinctly acid to methyl 903232 O - 50 - 12 red indicator ...
... mutarotation , allow sufficient time for its completion . Invert reading . - First determine the quantity of acetic acid neces- sary to render 50 ml of the lead - free filtrate distinctly acid to methyl 903232 O - 50 - 12 red indicator ...
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Common terms and phrases
alkaline analysis angle axis beam boiling Brix Bureau of Standards C. S. Hudson calculated carbon cell CHCl3 Chem chloride Clerget coefficient color concentration constant containing cooled copper correction crystals determined deut dextrose dilute direct polarization dissolved electrode equation evaporated filter filtrate flask formula glass glycosides grams H. S. Isbell H₂O halfshade heating hydrochloric acid hydrolysis instrument invert sugar invertase Jackson and Gillis lactose lamp lead acetate levulose measurements melting method methyl alcohol mg mg mg mixture molasses mutarotation nicol nicol prism normal weight obtained optical rotation oscillation oxide percent percentage plane polarized polariscope polarized light potassium precipitate prepared prism quantity quartz quartz control plates raffinose reaction reading reagent reducing sugars refracting saccharimeter salts sample sirup sodium specific rotation substance sucrose sucrose solutions Sugar Scale sugar solution sulfate sulfuric acid temperature tion titration tube vacuo volume washed wave length
Popular passages
Page 158 - If the analyst is in doubt as to the completion of the hydrolysis, allow a portion of the solution to remain for several hours and again polarize. If there is no change from the previous reading, the inversion is complete, and the reading and temperature of the solution should be carefully noted.
Page 181 - Titrate at once with the thiosulphate solution until the brown tinge has become weak, then add sufficient starch liquor to produce a marked blue coloration. Continue the titration cautiously until the color due to free iodin has entirely vanished.
Page 778 - After bringing the solution exactly to the mark at the proper temperature, and after wiping out the neck of the flask with filter paper, pour all of the wellshaken clarified sugar solution on a rapidly acting filter. Reject the first portions of the filtrate and use the rest, which must be perfectly clear for polarization.
Page 250 - In case the sample is too dense to determine the density directly, dilute a weighed portion with a weighed quantity of water, or dissolve a weighed portion and dilute to a known volume with water. In the first instance the per cent of total solids is calculated by the following formula : • WS Per cent of solids in the undiluted material= — • S=per cent of solids in the diluted material.
Page 789 - Receptacles — How sampled. — Sugar in hogsheads and other wooden packages shall be sampled by putting the long trier diagonally through the package from chime to chime, one trierful to constitute a sample, except in small lots, when an equal number of trierfuls shall be taken from each package to furnish the required amount of sugar necessary to make a sufficient sample. In the sampling of baskets, bags, seroons, and mats the short trier shall be used, care being exercised to have each sample...
Page 120 - Add strong ammonium hydroxide with constant stirring until the solution is alkaline to litmus, allow the precipitate to settle, and wash by decantation with water until the wash water gives only a slight test for sulfates with barium chloride solution.
Page 170 - Alkaline tartrate solution. — Dissolve 173 g of Rochelle salt and 50 g of sodium hydroxide in water, and dilute to 500 ml.
Page 155 - Defecate, if necessary, with basic lead acetate in the usual manner, making to volume at the temperature at which the observations are to be made.
Page 177 - By consulting the table it will be seen that the vertical column headed 150 is nearest to Z, 145, and the horizontal column headed 95 : 5 is nearest to the ratio of R to I, 95.1 : 4.9.
Page 783 - Inasmuch as the absorption of sea water or moisture reduces the polariscopic test of sugar, there shall be no allowance on account of increased weight of sugar importations due to unusual absorption of sea water or other moisture while on the voyage of importation.