| Synonyms | Isoascorbic acid |
| D-Araboascorbic acid |
| Definition | |
| Chemical name | D-Erythro-hex-2-enoic acid γ-lactone |
| Isoascorbic acid |
| D-Isoascorbic acid |
| Einecs | 201-928-0 |
| 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 | |
A.Melting range | About 164 oC to 172 oC with decomposition |
B.Positive test for ascorbic acid/colour reaction | |
| Purity | |
| Loss on drying | Not more than 0,4 % after drying under reduced pressure on silica gel for 3 hours |
| Sulphated ash | Not more than 0,3 % |
| Specific rotation | [α]10 % (w/v) aqueous solution between -16,5o to -18,0o |
| 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 |