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TABLE 90.-Zerban and Wiley factors for mixtures of dextrose and levulose (Lane and Eynon method)

[blocks in formation]

TABLE 91.-Lane and Eynon factors and reducing ratios for determinination of

dextrose and levulose in raw sugars

[10-ml of Soxhlet solution]

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TABLE 92. Milligrams of dextrose and levulose corresponding to milligrams of cupric oxide or copper, and reduction ratio, a, according to Erb and Zerban, for various proportions of dextrose and levulose in the presence of sucrose (0.4 g of total sugar in 50 ml of solution), using the Munson and Walker method

[blocks in formation]

TABLE 93. Copper-levulose equivalents according to the Jackson and Mathews modification of the Nyns selective method for levulose

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][subsumed][subsumed][subsumed][subsumed][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

TABLE 93. Copper-levulose equivalents according to the Jackson and Mathews modification of the Nyns selective method for levulose-Continued

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TABLE 94.-Ratio of levulose to total sugar from the Lane and Eynon titration and Nyns "apparent" levulose

Example illustrating the use of table 94.-Assume that a solution of levulose and dextrose gave a Lane and Eynon titer of 25.89 ml and that 20 ml of the same solution precipitated 247.3 mg of copper by the modified Nyns method. The original solution then contained by table 93 (100×71.7)/20=358.5 mg of apparent levulose per 100 ml.

Then

TXI 25.89 × 358.5
100
100

= 92.8.

Referring to the values tabulated below we find opposite this product and under T-25 the true ratio of levulose to total sugar to be 71.5 percent. The Lane and Eynon factor is 125.7, and the total sugar per 100 ml is 125.7/25.89=485.5 mg, of which 71.5 percent (347.1 mg) is levulose and 138.4 mg is dextrose.

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TABLE 94.-Ratio of levulose to total sugar from the Lane and Eynon titration and Nyns "apparent" levulose-Continued

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