Thearubigin
CAS: 12698-96-3
Category: Natural Products
| Purity | Thearubigin content ≥20%; ≥40%; ≥60%; ≥80% (UV/HPLC, product specification dependent) |
| Molecular Formula | Complex polyphenolic mixture (no fixed molecular formula) |
| Molecular Weight | Not applicable (heterogeneous polymeric mixture) |
| Appearance | Reddish-brown to dark brown powder |
| Packaging | 1 g, 5 g, 25 g, 100 g, 500 g, 1 kg aluminum foil bag or HDPE bottle with moisture-proof inner liner |
| Testing Indicators | Appearance — Visual inspection; Identification — UV-Vis spectroscopy, FTIR and LC-MS fingerprinting; Thearubigin content — Spectrophotometric determination or HPLC according to manufacturer method; Polyphenol content — Folin-Ciocalteu assay; Moisture — Karl Fischer titration or Loss on Drying (USP <731>); Heavy metals — ICP-MS or ICP-OES; Residual solvents — GC (USP <467>, when extraction solvents are used); Microbial limits — USP <61>/<62> or applicable food standards; Ash content — USP <281> or AOAC methods. |
| Storage Notes | Store tightly sealed in a cool, dry place (2–8°C for long-term storage), protected from light, oxygen, moisture, and excessive heat. Minimize repeated opening of the container. Store under inert gas for extended storage when possible. |
| Lead Time | 10 days |
A naturally occurring polyphenolic fraction isolated from fermented black tea. Widely used as a reference material in phytochemical research, antioxidant studies, nutraceutical development, functional food research, cosmetic formulations, and natural product investigations. Also employed for quality evaluation and characterization of black tea extracts.