| Analytical Items | Standard |
| Appearance | Almost white powder, Soluble in water |
| Identification | 1) Chemical reaction |
| 2) IR:consistent with the spectrum obtained with reference substance |
| 3) HPLC:the retention time of a major peak meets the 1.0-2.0 |
| Acid value | 1.0-2.0 |
| Clarity and color of solution | Not more intensely colored than reference solution Y2 |
| Heavy metals | ≤ 10ppm |
| Water | ≤ 2.5% |
| S-adenosyl-L-Homocysteine | ≤ 0.5% |
| Methylthioadenosine | ≤ 2.0% |
| Adenine | ≤ 0.5% |
| Total Yeasts and Molds | ≤ 100cfu/g | |
| Total bacterial count | ≤ 1000cfu/g | |
| (S,S)Isomer | ≥ 60.0% | |
| Endotoxin | ≤ 0.3EU/mg | |
| P-toluenesulfonati cacid | 21.0%~24.0% (basis on dried) | |
| Sulfates | 23.5%~26.5% (basis on dried) | |
| Ademetionine | ≥ 49.5% (basis on dried) | |
| Residue on Ignition | ≤ 0.5% | |
| Total content | ≥ 96.0% | |