E 315 ERYTHORBIC ACID
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Synonyms |
Isoascorbic acid; D-Araboascorbic acid |
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Definition |
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Einecs |
201-928-0 |
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Chemical name |
D-Erythro-hex-2-enoic acid γ-lactone; Isoascorbic acid; D-Isoascorbic acid |
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Chemical formula |
C6H8O6 |
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Molecular weight |
176,13 |
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Assay |
Content not less than 98 % on the anhydrous basis |
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Description |
White to slightly yellow crystalline solid which darkens gradually on exposure to light |
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Identification |
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Melting range |
About 164 °C to 172 °C with decomposition |
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Test for ascorbic acid/colour reaction |
Passes test |
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Specific rotation |
[α]D 25 10 % (w/v) aqueous solution between – 16,5° to – 18,0° |
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Purity |
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Loss on drying |
Not more than 0,4 % after drying under (reduced pressure on silica gel, 3 hours) |
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Sulphated ash |
Not more than 0,3 % |
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Oxalate |
To a solution of 1 g in 10 ml of water add 2 drops of glacial acetic acid and 5 ml of 10 % calcium acetate solution. The solution should remain clear |
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Lead |
Not more than 2 mg/kg |
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