Prop 65 Compliance for Sesame Seeds (Pb + Cd + Cr + Ethylene Oxide)

Sesame Sits at the Intersection of Soil Metals and Processing Risk

Sesame (Sesamum indicum) is a documented soil-metal bioaccumulator. Unhulled sesame retains higher levels of lead (Pb), cadmium (Cd), and chromium (Cr), while certain origins have a documented history of ethylene oxide (EO) residue.

Why This Matters

• Triple-metal profile: Unhulled sesame can carry Pb + Cd + Cr simultaneously.
• Hulling changes exposure: Hulled sesame often reduces Cd/Cr risk but not Pb entirely.
• Ethylene oxide history: EO is Prop 65-listed and historically used in certain export markets.
• Salmonella survival: Low-moisture pathogens create parallel FDA recall exposure.

By the Numbers — The Threshold Environment

• 0.5 µg/day — Lead MADL
• 4.1 µg/day — Cadmium MADL
• 0.5 µg/day — Chromium VI NSRL

Four Risk Drivers Converge in Every Lot

Each sesame SKU inherits overlapping origin, processing, and microbial risk.

• Soil & origin: India, Africa, Mexico/Guatemala each carry different baseline metal loads.
• Hulling decision: Hull retains more soil metals; risk profile shifts by processing step.
• EO residue screening: Certain import channels require mandatory testing.
• Grinding to tahini: Heat + cross-contact multiply exposure potential.

Metal uptake. Processing residue. Pathogen risk. Three parallel exposure pathways.

Chemical Inventory (Category Chemicals of Concern)

• Lead (Pb) — MADL 0.5 µg/day
• Cadmium (Cd) — MADL 4.1 µg/day
• Chromium VI — NSRL 0.5 µg/day
• Ethylene Oxide (EO) — listed carcinogen

Risk Profile by Product Format

• Unhulled sesame: Pb+Cd+Cr high
• Hulled sesame: Pb med; Cd/Cr lower
• Tahini: multi-serving exposure high
• Sesame snack sticks: aggregated exposure med–high

A Five-Pillar Compliance Program

• Pillar 1 — Hazard identification: origin + hulling risk mapping
• Pillar 2 — Exposure assessment: serving-size modeling vs MADL/NSRL
• Pillar 3 — Verification testing: ICP‑MS triple-metal panel + EO GC-MS
• Pillar 4 — Warning determination: SKU-specific labeling logic
• Pillar 5 — Records & reassessment: supplier qualification + FSMA alignment

Verification Testing — What, How, How Often

• Triple-Metal Panel: Pb, Cd, Cr — per lot
• EO Screening: per lot for higher-risk origins
• Salmonella PCR: incoming + post-hulling
• Trend analysis: monthly compliance review

ISO/IEC 17025 accredited laboratories only. Every lot tied to documented compliance determination.

90-Day Implementation Plan (Three Sprints)

Days 1–30 — Discover

• SKU intake & origin mapping
• Hulling status differentiation
• Historical metal & EO data review
• Initial gap report

Days 31–60 — Build

• Triple-metal testing program artifact
• Exposure modeling framework
• Supplier compliance pack rollout
• Warning decision matrix

Days 61–90 — Validate

• Mock NOV tabletop
• Internal audit + corrective actions
• QI approval & document control handoff