PRODUCT IDENTITY & SPECIFICATION
Understand the form.
Then review the grade.
A defined chemical identity is the starting point. The controlled product specification establishes the commercial limits.
DR.SPD / SUPPLIER SPECIFICATION
A defined ingredient grade.
Dr.SPD is supplied as spermidine trihydrochloride (CAS 334-50-9). The supplier specification sets a purity limit of ≥98.0% by GC. The table below translates the supplied Chinese specification; confirm the current controlled revision for each purchase.
| Parameter | Specification limit | Listed method |
|---|---|---|
| Appearance | White crystals | Visual observation |
| Purity | ≥98.0% | GC |
| Water solubility | Readily soluble | USP <1236> |
| Particle size | 95% passes 20 mesh | Sieving |
| Loss on drying | ≤1.0% | USP <731> |
| Residue on ignition | ≤1.0% | USP <281> |
| Arsenic / lead | ≤0.5 ppm each | USP <233> |
| Mercury / cadmium | ≤1 ppm each | USP <233> |
| Total heavy metals | ≤10 ppm | USP <233> |
| E. coli / S. aureus / Salmonella / P. aeruginosa | Not detected | USP <62> |
| Total coliform | <10 CFU/g | AOAC |
| Total yeast and mold | ≤10 CFU/g | USP <61> |
| Total viable aerobic count | ≤1000 CFU/g | USP <61> |
Sources: Shanghai EGT Synbio Group Co., Ltd., one-page Dr.SPD specification (undated); TDS version 01, revised 22 July 2026, pp. 1 and 3. Methods are listed as supplied; this is not a claim of USP certification. Pathogen sampling quantities are not specified in the one-page sheet and should be confirmed in the applicable method.
Open original specification · Chinese PDF ↗Parent compound and salt
| Identity reference | Spermidine | Spermidine trihydrochloride |
|---|---|---|
| Chemical form | Parent compound | Hydrochloride salt |
| CAS number | 124-20-9 | 334-50-9 |
| Molecular formula | C₇H₁₉N₃ | C₇H₁₉N₃·3HCl |
| Molecular weight | 145.25 g/mol | 254.63 g/mol (supplier TDS) |
| Reference | PubChem CID 1102 ↗ | PubChem CID 9539 ↗ |
Chemical identity does not certify a commercial batch. Molecular weights differ, so salt mass and spermidine free-base-equivalent content require distinct reporting.
How purity is reported
The supplied in-house standard, Q/EGT SYNBIO-STC-2025-1 (issued 22 July 2026), describes GC peak-area normalization following sample preparation. This purity result is not a calibrated free-base-equivalent assay. Confirm the calculation basis and method suitability for your intended use.
Three supplied company COAs report GC purity of 99.4%, 99.5% and 99.5%. These are results for identified batches; the published specification limit remains ≥98.0%.
Review the batch records ↗Storage and shelf life
The TDS declares 24 months when sealed and stored in a cool, dry place, protected from sunlight and moisture. Use the expiration date on the applicable batch COA. Stability-study details are available for discussion and have not been independently verified here.
Source: supplier TDS version 01, 22 July 2026, p. 3. This storage statement applies to the ingredient; finished-product stability needs separate testing.
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