Sourcing Sourcing Solutions
Maintain 100% production uptime with Exbiol® global stock. 8,000kg ready-to-ship from regional hubs. Standardized 25kg fiber drums. Lead time: 3-5 days.
R&D Technical Support
Secure regulatory approval with our Pharma-Grade Technical Dossier. Verified L-isomer specific rotation and GC-FID impurity profile. Zero synthetic adulteration.
As the life-science division of Zhonghong Group, Exbiol® provides premium Natural L-Menthol Crystals derived from 100% steam-distilled Mentha arvensis oil. We specialize in solving the sublimation and chiral purity challenges for Tier-1 pharmaceutical and oral care manufacturers.
2216-51-5
L-Menthol ≥ 99.5%
-45.0° to -51.0°
41°C – 44°C
Ethanol Only / Trace
3-7 Days (Global)
1. What is Natural L-Menthol Crystals?
Natural L-Menthol (4-isopropyl-1-methylcyclohexan-3-ol) is a covalent organic compound derived from Peppermint or Mint oils through steam distillation followed by fractional crystallization. Unlike synthetic racemic menthol, our Natural L-isomer possesses the highest biological cooling intensity. It is an essential active pharmaceutical ingredient (API) and flavor component valued for its localized anesthetic and decongestant functional properties.
2. Technical Specifications Table
| Analysis Item | USP/EP Specification |
|---|---|
| Identification | Positive (IR/TLC) |
| Non-volatile Residue | ≤ 0.05% |
| Residual Menthone | < 0.1% (GC-FID) |
3. Source & Botanical Origin
Exbiol® Natural Menthol is derived exclusively from Mentha arvensis cultivated in sustainable, GAP-compliant regions. Crude mint oil is subjected to cold-fractional crystallization, where transparent needle-like crystals are separated from the liquid “Dementholized Mint Oil” (DMO). This process ensures 100% botanical origin verification via HPTLC and GC-MS profiling.
4. Mechanism of Action
Menthol acts as a primary ligand for the TRPM8 (Transient Receptor Potential Melastatin 8) receptors on sensory neurons. Upon binding, it triggers a calcium ion influx that mimics a cooling sensation. In industrial formulations, it is valued for its functional property as a topical penetration enhancer, facilitating the delivery of co-actives across the epidermal barrier.
5. Application Benefits
- Therapeutic Decongestion: Functional property for oral care and external analgesics.
- Sensory Contrast: Formulation advantage providing immediate consumer-perceived efficacy.
- Pharma Compatibility: Stable in anhydrous systems and O/W emulsions.
Vapor Pressure Engineering
Menthol has a significant sublimation rate. Exbiol® utilizes Sublimation Resistance Packaging with nitrogen-sealing and vacuum-tested liners to prevent crystal degradation and mass loss during international sea freight.
Chiral Purity Validation
We solve the “Synthetic Spiking” audit risk. Every lot is verified via Chiral GC to confirm the 100% L-enantiomer ratio, ensuring the highest localized anesthetic property support.
Crystal Morphology Control
Our crystallization process maintains a specific needle-length-to-width ratio, optimizing flowability for high-speed pharmaceutical encapsulation lines (Size 0/00 capsules).
6. Usage & Formulation Guide
Dissolution Habitat: Highly soluble in fixed oils, mineral oil, and Ethanol (96%). Practically insoluble in water. R&D Recommendation: Melt into the oil phase at <45°C to preserve sensory potency.
pH Stability: High molecular stability between pH 3.0 and 9.0; compatible with non-ionic and anionic surfactant systems.
7. Industrial Evolution
From crude “Mint Snow” in the 1920s to synthetic racemic menthol in the 1970s, the industry has now returned to Standardized Natural L-Menthol. Exbiol’s fourth-generation fractional crystallization ensures zero Menthone residual, satisfying the stringent “Clean Label” and pharmaceutical demands of the modern era.
Scientific Validation & Batch Analytics
GC-FID Peak Analysis
Batch-release analytics documenting 99.5% purity with zero unknown impurities over 0.05%.
Accelerated Stability
40°C / 75% RH testing confirms <0.5% potency loss over 6 months in Exbiol® S-Sealed drums.
8. COA & Quality Control Specifications
Table 8.1: Physical & Chemical Analysis
| Testing Item | Industrial Specification | Test Method |
|---|---|---|
| Assay (L-Menthol) | ≥ 99.5% | GC-FID |
| Identification | Positive | HPTLC / IR |
| Specific Rotation | -45.0° to -51.0° | USP <781> |
| Bulk Density | 0.35 – 0.45 g/ml | USP <616> |
Table 8.2: Heavy Metals (Trace Analysis)
| Item | Spec | Method |
|---|---|---|
| Lead (Pb) | < 0.5 ppm | ICP-MS |
| Arsenic (As) | < 0.1 ppm | ICP-MS |
Table 8.3: Safety & Residue Control
| Item | Spec | Method |
|---|---|---|
| Pesticides (400+) | Negative | GC-MS/MS |
| Residual Ethanol | < 500 ppm | GC-HS |
Table 8.4: Microbiological Profile
| Analysis | Spec | Method |
|---|---|---|
| TAMC | < 1,000 cfu/g | USP <61> |
| Salmonella | Negative | USP <62> |
9. Manufacturing Flow Description
10. Storage & Packaging
Primary: Nitrogen-flushed aluminum bottles or vacuum-sealed PE bags (25kg drum). Store at <20°C to prevent crystal massing. Avoid all UV exposure.
11. MOQ, Sample & Global Shipping
MOQ: 25kg bulk; 1kg trial batches. 100g samples with full GC report. Global dispatch from Shaanxi or Shanghai Port hubs within 3-5 working days. DDP/CIF available for all major markets.
12. Scientific Research & Clinical Data
Human trials demonstrate that 1.0% menthol topical application activates skin TRPM8 receptors to increase microcirculation. Clinical research confirms L-menthol as a potent penetration enhancer for dermaceutical formulations.
13. Applicable Industries
Oral Care Manufacturing
Cosmeceuticals
14. B2B Application Scenarios
Contract manufacturers utilize Exbiol® Menthol for high-transparency lip balms, muscle rubs, anesthetic throat sprays, and dental hygiene solutions requiring instant aqueous clarity.
15. Industrial Market Applications
For brands targeting the OTC Topical Analgesic market, choosing a USP-compliant natural menthol is the primary differentiator to ensure safety audits and avoid synthetic isomer contamination.
16. Supplier Comparison & Procurement Guide
| Metric | Standard Trader Grade | Exbiol® Phyto-Engineering |
|---|---|---|
| Chiral Purity | Unverified racemic mix | 100% L-Enantiomer Verified |
| Volatility Loss | High (Irregular crystals) | Uniform Needle (Sublimation Control) |
| Traceability | Spot sourcing (Market mix) | Seed-to-Crystal Batch Fingerprint |
17. Technical FAQ for Bulk Buyers
Q: How does the purity of your menthol compare to USP monographs?
Our L-Menthol strictly adheres to USP <621> and USP <467> standards, providing ≥99.5% assay via GC-FID and verified specific rotation of -45.0° to -51.0°.
Q: How is sublimation controlled during maritime transport?
We use double-layered vacuum-sealed PE bags and nitrogen-blanketed secondary steel drums to stabilize internal vapor pressure.
Q: Is residual menthone monitored lot-by-lot?
Yes. Menthone and menthyl acetate are monitored as primary indicators of fractional crystallization efficiency, kept <0.1%.
Q: What is the recrystallization risk in anhydrous ointment systems?
Our uniform needle size minimizes nucleation sites. We recommend a formulation concentration below 5.0% for maximum thermodynamic stability.
Q: Does the product comply with FEMA/IFRA regulations?
Yes, our natural menthol crystals are FEMA GRAS and IFRA compliant for global fragrance and flavor use.
18. References & Regulatory Sources
- PubMed: Pharmacokinetics of L-Menthol in Transdermal Delivery.
- FDA: OTC Drug Monograph for External Analgesics.
- USP / EP / ICH Q3C Guidelines.
Exbiol® Quality Assurance
Manufactured by Shaanxi Zhonghong Investment Technology Co., Ltd. Every industrial batch is 100% traceable from seed source to the final fiber drum. ISO 9001 & GMP Certified production cycles.
✔ Full COA Verification
✔ 8,000kg Bulk Stock
