L-Serine Powder

JAMMARK INTERNATIONAL TRADINGE(ZIBO) CO., LTD. is one of the most professional manufacturers and suppliers of l-serine powder in China. If you're going to buy high quality l-serine powder made in China, welcome to get more information from our factory. For price consultation, contact us.

L-Serine Powder Description

L-serine is a neutral amino acid with an isoelectric point of 5.68. It exists as hexagonal plate or prismatic crystals and is odorless with a sweet taste. The solubility of L-serine is 50 g/L.

Product information

L-Serine Powder Market and Specifications

• Purity: Food/pharmaceutical grade, typically ≥99%;
• Packaging: 25kg/drum (industrial use);
• Storage: Store tightly closed in a cool, dry place at 2-8°C away from light.

How to judge the quality of L-serine powder ?

The quality of L-serine powder needs to be judged through comprehensive sensory inspection, physical and chemical indicators and purity testing. The specific methods are as follows:

1. Sensory Inspection

• Appearance: Should be white crystals or crystalline powder, odorless, and slightly sweet. A pale yellow color or lumps may indicate degradation or contamination.
• Solubility: Easily soluble in water (approximately 25g/100mL at 25°C), practically insoluble in ethanol and ether.

2. Physical and Chemical Index Testing

• Loss on Drying: ≤0.3% (drying at 105°C for 3 hours).
• Residue on Ignition: ≤0.1% (ignited to constant weight at 700°C).
• Acidity (pH): 5.5-6.5 (measured by dissolving 0.3g sample in 30mL of water).
• Specific Rotation: +6.8° to +7.9° (measured in 1mol/L hydrochloric acid solution at 25°C). Values ​​outside this range may indicate contamination of the D-isomer.

3. Purity and Impurity Control

• Assay: ≥99% on a dry basis (HPLC or chromatography).
• Heavy Metals: ≤10 ppm (e.g., lead, arsenic)
• Other Amino Acids: ≤0.5% (by chromatographic spot comparison)

4. Special Testing

• Transmittance: ≥98% (measured at 430nm).
• Microbial Limits: Pharmaceutical grade must comply with pharmacopoeial microbiological standards (e.g., USP/EP).

5. Standards

• Food Grade: Refer to FCC standards (e.g., loss on drying ≤ 0.3%).
• Pharmaceutical Grade: Must comply with the Chinese Pharmacopoeia or USP/EP requirements (e.g., specific rotation, residue on ignition).

The above multi-dimensional testing can comprehensively evaluate the quality of L-serine powder to ensure its suitability for food, medicine or cosmetics.