Pharmaceutical Grade D-Tyrosine Industrial Purity Specifications
- Assay standards maintained between 98.5% to 101.0% for strict compliance.
- L-Isomer impurity limits controlled below 0.5% to ensure optical purity.
- Heavy metals and residue on ignition thresholds meet global pharmacopeia requirements.
In the landscape of fine chemical manufacturing, the demand for high-enantiomeric purity intermediates is critical for downstream drug synthesis. D-Tyrosine (CAS: 556-02-5), chemically known as (2R)-2-amino-3-(4-hydroxyphenyl)propanoic acid, serves as a fundamental peptide building block in the development of complex therapeutic agents. As a global manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. adheres to rigorous industrial purity specifications to ensure consistency across bulk batches. This technical overview details the critical quality attributes, synthesis parameters, and safety protocols required for pharmaceutical grade procurement.
Critical Quality Attributes and Physical Specifications
Industrial scalability relies on reproducible physical properties. For D-Tyrosine powder, the melting point and optical rotation are primary indicators of crystalline integrity and enantiomeric excess. Standard industry specifications dictate a melting point range between 310°C and 314°C, indicating high thermal stability suitable for various reaction conditions. Furthermore, the specific optical rotation must align closely with +11° (c=4 in 1N HCl) to confirm the D-configuration. Deviations in these values often signal the presence of racemic mixtures or solvent inclusions.
The following table outlines the standard specification profile expected for high-quality bulk supply:
| Parameter | Specification Standard | Test Method |
|---|---|---|
| Chemical Name | D-Tyrosine (H-D-Tyr-OH) | INCI / IUPAC |
| CAS Number | 556-02-5 | Registry |
| Assay (Dry Basis) | 98.5% - 101.0% | Non-aqueous Titration / HPLC |
| Optical Rotation | +10.5° to +11.5° | Polarimetry |
| Melting Point | 310°C - 314°C | DSC / Capillary |
| Loss on Drying | < 0.5% | Karl Fischer / LOD |
| Residue on Ignition | < 0.1% | Gravimetric |
Understanding L-Isomer Impurity Limits Below 0.5 Percent
Chiral purity is the most critical parameter for D-Tyr used in stereoselective synthesis. The presence of the L-isomer can lead to diastereomeric impurities in the final peptide product, complicating purification and potentially affecting biological activity. Industrial specifications typically require the L-Tyrosine content to be maintained below 0.5%. Achieving this level of enantiomeric excess requires advanced resolution techniques during the manufacturing process.
At NINGBO INNO PHARMCHEM CO.,LTD., chiral HPLC is employed to verify enantiomeric purity for every batch. This ensures that the material functions correctly as a synthesis intermediate without introducing stereochemical errors. When evaluating suppliers for a critical chiral amino acid, verification of optical rotation and chiral chromatography data is paramount to ensure downstream reaction success.
Assay Standards Between 98.5 Percent To 101.0 Percent
The assay value represents the quantitative content of the active molecule. A range of 98.5% to 101.0% is standard for pharmaceutical grade materials. This tight tolerance accounts for minor variations in hydration while ensuring sufficient reactivity for coupling reactions. The assay is typically determined via non-aqueous titration using perchloric acid or validated HPLC methods against a certified reference standard.
Maintaining this assay range is vital for stoichiometric calculations in large-scale peptide synthesis. Deviations outside this window can lead to excess reagent usage or incomplete reactions, impacting overall yield and cost efficiency. Bulk purchasers should request a COA (Certificate of Analysis) with every shipment to verify that the assay falls within these acceptable quality ranges.
Heavy Metals And Residue On Ignition Thresholds
Safety and regulatory compliance dictate strict limits on elemental impurities. Residue on ignition (sulfated ash) should not exceed 0.1%, indicating minimal inorganic contamination from catalysts or processing equipment. Furthermore, heavy metals such as lead, arsenic, and mercury must be kept below ppm levels defined by ICH Q3D guidelines.
Modern manufacturing facilities utilize ICP-MS (Inductively Coupled Plasma Mass Spectrometry) to detect trace metals at parts-per-billion levels. This level of scrutiny ensures that the D-Tyrosine is safe for use in human therapeutic applications. Comprehensive documentation, including Safety Data Sheets (SDS) and Certificates of Origin (COO), accompanies the material to facilitate customs clearance and regulatory filings.
Synthesis Route and Industrial Applications
Commercially, H-D-Tyr-OH is often synthesized from phenylalanine through enzymatic or chemical conversion pathways. The synthesis route selected impacts the cost structure and environmental footprint of the production. Efficient processes maximize yield while minimizing solvent waste, aligning with green chemistry principles.
Beyond peptide synthesis, this compound is utilized in research focused on neurotransmitter support, as it is a precursor to dopamine and epinephrine. It is also explored in dermatological applications for melanin production and in sports nutrition research. However, for industrial buyers, the primary focus remains on its utility as a high-purity building block. Solubility data indicates the material is soluble in water, facilitating its use in aqueous reaction media, though care must be taken to store it away from strong oxidizing agents.
Procurement and Documentation Standards
Reliable supply chains require transparent documentation. Buyers should expect access to Product Specifications (PS) detailing chemical composition and storage requirements. Lot and Batch Numbers must be clearly labeled to allow for traceability via the COA system. Storage conditions generally recommend ambient temperatures in tightly closed containers to prevent moisture uptake.
For organizations requiring large volumes, partnering with a dedicated manufacturer ensures consistent quality and competitive bulk price structures. NINGBO INNO PHARMCHEM CO.,LTD. provides comprehensive technical support and logistics solutions to global clients. By prioritizing industrial purity and regulatory compliance, we support the development of next-generation pharmaceuticals and research initiatives.
In conclusion, securing high-quality D-Tyrosine requires a thorough understanding of purity specifications, chiral limits, and safety thresholds. By adhering to these rigorous standards, manufacturers can ensure the integrity of their final products while maintaining efficient production workflows.