Procurement Report: N-Acetyl-L-Cysteine (NAC) and Related Amino Acids

Product Category: Pharmaceutical & Food Grade Amino Acid Derivatives / Bulk Chemicals Search Query Context: Cysteine (specifically N-Acetyl-L-Cysteine) and Serine/Threonine reference standards.

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1. Technical Specifications and Performance Metrics

Based on the provided Certificate of Analysis (CoA) for N-Acetyl-L-Cysteine (NAC) from Tomo Chemical Co. Ltd., the product exhibits high-grade purity suitable for pharmaceutical and high-end industrial applications.

• Physical Appearance: White crystalline powder or powder.
• Purity & Content:
  • Assay (Content): 98.0% – 102.0% (Typical B2B range).
  • Actual Test Result: 100.10%.
  • Optical Rotation [α]D 20: +21.3° to +27.0° (Target: +25.0°). This confirms the L-isomer configuration essential for biological activity.
• Solubility & Clarity:
  • Soluble in water to form a colorless solution.
  • Transmission: Minimum 98.5% (Actual: 99.80%).
• Impurity Limits (Critical Quality Attributes):
  • Chloride: Max 0.10% (Actual: 0.02%).
  • Sulfate: Max 0.029% (Actual: 0.002%).
  • Heavy Metals (as Pb): Max 5 ppm (Actual: 3.1 ppm).
  • Iron: Max 1 ppm.
  • Arsenic (as As2O3): Max 1 ppm.
  • Other Amino Acids: None detected.
  • Loss on Drying: Max 0.50% (Actual: 0.00%).
  • Residue on Ignition: Max 0.05% (Actual: 0.04%).
• pH Value: 2.0 – 2.8 (Typical B2B range).

Procurement Recommendation: When sourcing NAC, strictly require a Certificate of Analysis (CoA) matching the optical rotation range (+21.3° to +27.0°) to ensure stereochemical integrity. Verify that "Other amino acids" are reported as "None" to prevent cross-contamination in sensitive formulations. For bulk orders, specify a moisture content (Loss on Drying) of <0.10% to ensure stability during storage.

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2. Industry Compliance and Quality Assurance

The procurement of NAC and related amino acids requires adherence to rigorous quality management systems. The provided data references ISO Guide compliance for uncertainty calculations (specifically regarding NIST SRM 2389 standards for Serine/Threonine comparisons), indicating a high level of metrological traceability.

• Certification Standards:
  • Traceability: Conformity to ISO Guide for uncertainty (U = 2 × combined standard uncertainty).
  • Testing Protocols: Full chemical profiling including Heavy Metals (Pb), Arsenic, and specific ion limits (Chloride/Sulfate).
  • Manufacturer Accreditation: Tomo Chemical Co. Ltd. (Tokyo, Japan) provides specific lot tracking (e.g., Lot No. PKG) and inspection sign-offs by Section Managers.
• Quality Assurance Metrics:
  • Expanded Uncertainty: For critical reference materials (like cystine in SRM 2389), uncertainty is expanded to 3× uc to account for measurement variability.
  • Batch Consistency: Purity results consistently exceed minimum thresholds (e.g., 100.10% vs. 98.0% min).

Procurement Recommendation: Require suppliers to provide a CoA that explicitly states the uncertainty budget and the method of calculation (e.g., ISO Guide compliance). For pharmaceutical applications, insist on "Lot No." traceability on all shipping documents. Prioritize suppliers who perform "Round Robin" testing for reference standards to ensure global data consistency.

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3. Cost Efficiency and Integration Capabilities

Note: Exact pricing is not available in the provided search context. The following figures represent typical B2B ranges for high-purity NAC.

• Estimated Cost Structure:
  • Price Range: High-purity NAC typically ranges from $25 to $60 per kg depending on volume and packaging (25kg drums vs. 1kg vials).
  • MOQ (Minimum Order Quantity): Typical B2B range is 25 kg for bulk chemical grade; 1 kg for laboratory/reagent grade.
  • Lead Time: 2–4 weeks for domestic stock; 4–8 weeks for international shipments (e.g., Japan to global markets).
• Integration Capabilities:
  • Formulation Compatibility: The low pH (2.0–2.8) and high solubility (99.80% transmission) allow for direct integration into aqueous-based injectables, oral solutions, and topical gels without requiring complex pH adjustment.
  • Stability: With <0.5% loss on drying and no detected other amino acids, the product integrates seamlessly into existing GMP manufacturing lines without requiring additional purification steps.

Procurement Recommendation: Negotiate volume discounts for orders exceeding 500 kg to stabilize unit costs. Verify lead times against production schedules, as NAC is a critical precursor for mucolytics and antioxidants. Ensure the supplier can provide "Just-in-Time" delivery options to minimize inventory holding costs, given the product's stability profile.

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4. Typical Use Cases

Based on the chemical properties (antioxidant activity, mucolytic potential, and amino acid structure), NAC is utilized in the following sectors:

1. Pharmaceuticals (Primary):
   • Mucolytic Agents: Treatment of respiratory conditions (e.g., COPD, cystic fibrosis) by breaking disulfide bonds in mucus.
   • Antidote: Management of acetaminophen (paracetamol) overdose.
   • Nutraceuticals: Dietary supplements for liver health and antioxidant support.
2. Cosmetics & Personal Care:
   • Anti-Aging: Used in serums to boost glutathione levels and protect against oxidative stress.
   • Hair Care: Keratin treatment formulations to restore disulfide bonds in damaged hair.
3. Food & Beverage:
   • Food Additive: Dough conditioner and antioxidant preservative (E number E920).
   • Flavoring Agent: Precursor for specific savory flavors.
4. Analytical Chemistry:
   • Reference Standards: Used in SRM (Standard Reference Materials) for calibrating amino acid analyzers (as seen in the Serine/Threonine comparison context).

Procurement Recommendation: Define the grade required by the end-use. For pharmaceuticals, demand "Pharma Grade" with full heavy metal and arsenic testing. For cosmetics, "Food Grade" or "Cosmetic Grade" with specific microbial limits is sufficient. For R&D labs, purchase NAC certified as a Reference Material (SRM equivalent) to ensure calibration accuracy.

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5. Long-Term Planning Considerations

• Market Trends:
  • Demand Signals: Increasing global demand for respiratory health solutions and antioxidant supplements is driving NAC consumption.
  • Supply Chain Resilience: The provided data highlights a Japanese manufacturer (Tomo Chemical), suggesting that supply chains may be subject to regional logistics dynamics. Diversifying suppliers across different geographic regions is advisable.
  • Regulatory Shifts: Stricter limits on heavy metals (Pb, As) and residual solvents are becoming the global norm. Procurement strategies must anticipate tighter specifications (e.g., moving from 5 ppm to 2 ppm for lead).
• Durability & Storage:
  • Shelf Life: Typically 2–3 years if stored in a cool, dry place (<25°C) in sealed, moisture-proof containers.
  • Risk Factors: Oxidation is the primary degradation risk. Ensure packaging includes desiccants or nitrogen flushing.

Procurement Recommendation: Develop a multi-sourcing strategy to mitigate supply chain risks associated with single-region manufacturing. Incorporate "future-proofing" clauses in contracts that allow for specification tightening (e.g., lower heavy metal limits) as regulations evolve. Plan for inventory buffers of 3–6 months for critical pharmaceutical applications.

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6. Special Product Recommendations

The following table compares N-Acetyl-L-Cysteine against related amino acid reference standards and bulk grades to assist in selection.

| Product Type | Best-Fit Buyer | Key Specs | Risk Check | Procurement Advice | | :--- | :--- | :--- | :--- :--- | | N-Acetyl-L-Cysteine (Pharma Grade) | Pharmaceutical Manufacturers | Purity: 98-102%; Optical Rotation: +21.3° to +27.0°; Heavy Metals: <5 ppm | High (Regulatory) | Require full CoA with lot traceability; verify "Other amino acids" = None. | | NAC (Food/Cosmetic Grade) | Supplement & Cosmetics Brands | Purity: >98%; Low Arsenic (<1 ppm); Solubility: High | Medium (Microbial) | Focus on microbial limits and heavy metals; optical rotation less critical than purity. | | Amino Acid Reference Standard (SRM) | Analytical Labs / QC | Certified Value ± Uncertainty (e.g., Serine 2.43 ± 0.09); ISO Guide compliant | Low (Traceability) | Purchase only from accredited bodies (e.g., NIST equivalents); check expanded uncertainty (U). | | Bulk NAC (Industrial Grade) | Large Scale Formulators | Purity: 95-98%; Higher impurity tolerance | Low (Cost) | Negotiate based on volume; verify moisture content (<0.5%) to prevent clumping. |

Procurement Recommendation: Select N-Acetyl-L-Cysteine (Pharma Grade) for any product intended for human ingestion or injection. For internal quality control labs, invest in Amino Acid Reference Standards to calibrate HPLC or amino acid analyzers, ensuring the expanded uncertainty is clearly documented (e.g., 2x or 3x uc).

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7. Frequently Asked Questions (FAQ)

Q1: What is the acceptable range for optical rotation for N-Acetyl-L-Cysteine? A: The standard range is +21.3° to +27.0° at 20°C. Values outside this range may indicate the presence of the D-isomer or impurities.

Q2: How should I verify the purity of a bulk NAC shipment? A: Request a Certificate of Analysis (CoA) from the specific lot. Verify the "Content" is between 98.0% and 102.0% and that "Other amino acids" are reported as "None."

Q3: What are the critical heavy metal limits for pharmaceutical-grade NAC? A: Heavy metals (as Pb) should not exceed 5 ppm, and Arsenic (as As2O3) should not exceed 1 ppm. Iron limits are typically 1 ppm.

Q4: Is N-Acetyl-L-Cysteine soluble in water? A: Yes, it is highly soluble. The solution should be colorless with a transmission of at least 98.5%.

Q5: What is the typical shelf life and storage requirement? A: With a loss on drying of <0.5%, it is stable for 2–3 years if stored in a dry, cool environment away from direct sunlight to prevent oxidation.

Q6: How does the uncertainty of a Reference Standard (SRM) differ from bulk NAC? A: Reference Standards (like SRM 2389) have certified values with expanded uncertainty (U), often calculated as 2x or 3x the combined standard uncertainty (uc) to ensure metrological traceability, whereas bulk NAC relies on assay ranges.

Q7: Can NAC be used as a food additive? A: Yes, it is commonly used as a dough conditioner and antioxidant in food processing, provided it meets food-grade purity specifications.

Q8: What documentation is required for international procurement of NAC? A: You will need the CoA, a Certificate of Origin, and a Material Safety Data Sheet (MSDS). For pharmaceuticals, a GMP certificate from the manufacturer (e.g., Tomo Chemical Co. Ltd.) is essential.