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