| Not official USP-NF text | ||||
|---|---|---|---|---|
| TRYPTOPHAN | ||||
| PF | LGS# | Brand | Type of Test | Additional Information |
| 33(6) | L1 | Ultrasphere ODS | Chromatographic purity | 4.6 mm x 25 cm, 5 µm. |
| 33(6) | L1 | Delta-Pak C18 | Limit of . . . . . . . . . | Limit of tryptophan related compound A. 3.9 mm x 15 cm, 5 µm. |
| 18(3) | G43 | None Cited | Organic volatile impurities | See Method IV  467 |