The Sugar Content of Hydrol (Corn Feeding Molasses)

Peckham, George T; Engel, Christine

doi:10.1093/jaoac/36.2.457

Cited by 2 publications

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“…Peckham and Engel (14), working at 0.25% concentrations of both starch and sugar mixtures, found a correction factor to be necessary to obtain correct analytical values. Dimler and others (5), working with dextran, have also found this to be true.…”

Section: Discussionmentioning

confidence: 99%

Starch Hydrolyses, Presence of Levoglucosan in Cornstarch Hydrolyzates

Ough¹,

Rohwer²

1956

J. Agric. Food Chem.

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Levoglucosan (1 , -anhydro-D-glucose) was found to the extent of 2.3% in a quantitative paper chromatographic investigation of cornstarch acid-hydrolyzates at equilibrium. The identification of levoglucosan in constant amount supports the view that the cornstarch molecule cannot be hydrolyzed completely to D-glucose by acid. In this study, other components tentatively identified were 5-hydroxymethyl-2-furaldehyde, glycerol, xylose, arabinose, fructose, isomaltose, and gentiobiose. D-Glucose and levoglucosan, when subjected to reaction conditions similar to those for the acid hydrolysis of starch, produce essentially the same equilibrium mixture as that obtained with starch. THE STUDY OF THE COMPOSITION of acid-hydrolyzed cornstarch systems has received the attention of many investigators (70). By various methods of

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Section: Discussionmentioning

confidence: 99%

Starch Hydrolyses, Presence of Levoglucosan in Cornstarch Hydrolyzates

Ough¹,

Rohwer²

1956

J. Agric. Food Chem.

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“…Soc., 74, 4178 (1952). (19) Tompkins, E. R., Khym, J. X., and Cohn, W. E., Ibid., 69, 2769Ibid., 69, (1947. (21) Willard, .…”

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confidence: 99%

“…At the point of maximum reducing power in the hydrolysis of dextran the extent of destruction of nglucose was the same (about 4%), within the limitations of the measurements, regardless of whether sulfuric or hydrochloric acid was used (Table I). At a given normality of acid it is true that sulfuric acid caused slower loss of D-glucose than did hydrochloric acid {18, 19). This difference in rate of destruction, however, is balanced by the need for a longer hydrolysis time to reach the maximum in the dextran hydrolysis curve with sulfuric acid.…”

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confidence: 99%

Analytical Total Acid Hydrolysis of Dextrans

Dimler¹,

Davis²,

Gill³

et al. 1954

Anal. Chem.

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The remainder of the lanthanum-140 is not lost but stays with the barium-140.The quantitativeness of precipitation of barium nitrate in 80% nitric acid was determined by analyzing the filtrates for barium-140 by the method of differential decay (6). The average barium concentration in the 80% nitric acid filtrates was 0.01 mg. of barium per milliliter. Since the total volume was 5 ml. and about 250 mg. of barium carrier was used, the amount of barium-140 remaining in the filtrate as a radioactive impurity in the lanthanum-140 was found to be approximately 0.03%.The recommended procedure is particularly effective for preparing carrier-free lanthanum-140 because only strontium, barium, radium, and lead form insoluble nitrates in 80% nitric acid (21). Hence, the lanthanum-140 which grows in after the first milking need be separated only from these elements and their daughter activities. Radium and lead were both found to be absent, as the alpha activity in the lanthanum-140 mounts did not differ significantly from background. (All radioactive isotopes of lead and radium have alpha emitters in their decay chains.) The quantity of barium has been shown to be very low, and the same is probably true for strontium (21). However, if

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The Sugar Content of Hydrol (Corn Feeding Molasses)

Cited by 2 publications

References 0 publications

Starch Hydrolyses, Presence of Levoglucosan in Cornstarch Hydrolyzates

Starch Hydrolyses, Presence of Levoglucosan in Cornstarch Hydrolyzates

Analytical Total Acid Hydrolysis of Dextrans

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