Technical aspects
Alpha-lipoic acid powder is a slightly yellow powder with a homogeneous structure and fine granulation. The raw material is characterised by high purity confirmed by HPLC analysis, low moisture content and compliance with pharmacopoeia standards. The physicochemical and microbiological parameters are within the required standards, which allows for its safe use in dietary supplements and functional foods.
| Parameter | Value |
|---|---|
| Appearance | Light yellow powder |
| Melting point | 60–62℃ |
| Specific rotation | -1.0° to +1.0° |
| Loss on drying | ≤ 0.2% |
| Residue on calcination | ≤ 0.1% |
| Particle size | 100% passes through a 40 mesh sieve |
| Content (HPLC) | 99–101% |
| Single impurity | ≤ 0.1% |
| Total impurities | ≤ 2.0% |
| Heavy metals | ≤ 10 ppm |
| Lead | ≤ 2 ppm |
| Arsenic | ≤ 1 ppm |
| Cadmium | ≤ 1 ppm |
| Mercury | ≤ 0.1 ppm |
