Table of Contents
1. Microbiological Testing
Microbiological contamination is the most common reason for herb and spice shipment rejections at international ports. Every batch must undergo testing for:
| Test | EU Limit | US Limit | Method |
|---|---|---|---|
| Total Plate Count (TPC) | 10⁶ CFU/g | 10⁶ CFU/g | ISO 4833 |
| E. coli | 10² CFU/g | Absent/g | ISO 16649 |
| Salmonella | Absent/25g | Absent/25g | ISO 6579 |
| Yeasts & Molds | 10⁴ CFU/g | 10⁴ CFU/g | ISO 21527 |
| Coliforms | 10³ CFU/g | 10³ CFU/g | ISO 4832 |
Steam sterilization is the preferred method for reducing microbial loads in herbs while preserving flavor and aroma. At HS Herbs, all products undergo steam treatment to meet the strictest international standards.
2. Heavy Metals Analysis
Heavy metal contamination from soil, water, or processing equipment poses health risks. Key metals tested include:
- Lead (Pb) — EU limit: 1.0 mg/kg for dried herbs; FDA: 1.0 ppm
- Cadmium (Cd) — EU limit: 0.20 mg/kg for herbs and spices
- Mercury (Hg) — No specific herb limit; general: 0.1 mg/kg
- Arsenic (As) — Varies by market; typically ≤ 3.0 mg/kg for inorganic arsenic
Testing is performed using ICP-MS (Inductively Coupled Plasma Mass Spectrometry) for maximum accuracy. Egyptian herbs from established farms in the Nile Valley consistently test well below regulatory limits.
3. Pesticide Residue Screening
The EU's Maximum Residue Levels (MRLs) are the global benchmark. Multi-residue analysis screens for 500+ active substances using LC-MS/MS and GC-MS/MS methods. Key points:
- The EU's default MRL for unregulated substances is 0.01 mg/kg
- US EPA tolerances may differ from EU — always verify target market regulations
- Japanese positive list system covers 799 substances with strict default limits
- Egypt's arid climate naturally requires fewer pesticides than humid growing regions
4. Mycotoxin & Aflatoxin Testing
Aflatoxins (B1, B2, G1, G2) and Ochratoxin A are major concerns for dried herbs stored in humid conditions:
- EU limits — Aflatoxin B1: 5 µg/kg; Total aflatoxins: 10 µg/kg
- US FDA action level — Total aflatoxins: 20 µg/kg
- Ochratoxin A — EU limit: 15 µg/kg for capsicum, pepper, nutmeg
Egypt's dry climate (relative humidity 30-50%) provides a natural advantage against mycotoxin development. Proper post-harvest drying to ≤ 10% moisture and controlled storage environments are critical.
5. Physical & Chemical Analysis
Beyond safety testing, quality parameters determine commercial value:
- Moisture content — Target: 8-12% depending on product (Karl Fischer or oven methods)
- Essential oil content — Determined by steam distillation (Clevenger apparatus)
- ASTA color value — Critical for paprika, chili, and turmeric (spectrophotometric method)
- Ash content — Indicates mineral content and cleanliness (total ash ≤ 12-15%)
- Acid-insoluble ash — Detects sand and soil contamination (≤ 2.0%)
- Volatile oil — GC-MS profiling for specific compound identification
6. HS Herbs Quality Assurance Process
Our quality laboratory follows a rigorous testing protocol for every export batch:
- Incoming inspection — Visual check, moisture measurement, and rapid aflatoxin screening
- Pre-processing sample — Full microbiological panel + essential oil analysis
- Post-processing verification — Steam sterilization confirmation, final COA generation
- Pre-shipment testing — Third-party lab verification available upon request
- Certificate of Analysis (COA) — Provided with every shipment including all test results
View our complete product catalog or learn more about our quality certifications.