Hulled vs Unhulled Sesame Seeds: A Procurement Guide

Hulled sesame seeds have their outer seed coat removed, producing a white, smooth seed with milder flavour and approximately 50–55% oil content. Unhulled (natural) sesame seeds retain their hull, giving a tan-to-brown colour, slightly bitter taste, and higher calcium content (975 mg/100g vs 60 mg/100g for hulled). For food manufacturers, the hull status determines application, specification requirements, and critically, contamination risk profiles.

In short:

• Hulled sesame is standard for tahini, halva, bakery toppings, and food service. Unhulled sesame is used in Asian cuisines, health food products, and sesame oil production. The hulling method (mechanical vs chemical/lye) affects the product’s ‘natural’ label status.
• Sesame has been the most RASFF-notified product category in recent years, primarily due to ethylene oxide (EtO) residues from Indian imports and recurring Salmonella contamination. Rigorous testing is non-negotiable.
• Important origins: India (40%+ of global trade), Sudan, Ethiopia, Tanzania, Myanmar, and Nigeria. Indian sesame dominates bulk supply but requires enhanced due diligence for EtO compliance.

Sesame: Europe’s Highest-Risk Ingredient Since 2020

Sesame seeds have been one of the most frequently flagged products in the EU RASFF (Rapid Alert System for Food and Feed). The two primary concerns are:

Ethylene oxide (EtO) contamination: Since 2020, hundreds of RASFF notifications have been issued for sesame seeds containing ethylene oxide residues, primarily from Indian origins. EtO is used as a fumigant to control Salmonella but is banned in the EU for food use.

Ethylene oxide residue must comply with EU MRLs under Regulation (EC) 396/2005, which range from 0.02 to 0.1 mg/kg depending on the commodity (e.g. 0.05 mg/kg for oilseeds, 0.02 mg/kg for cereals and pulses, 0.1 mg/kg for spices). For food additives, the limit is 0.1 mg/kg under Regulation (EU) 2022/1396. Request EtO testing on every batch from Indian, African, and Asian origins.

Salmonella: Sesame is a low-moisture product with a known Salmonella risk. The warm, humid conditions in major producing countries create contamination opportunities during harvesting, drying, and storage. EU regulations require absence of Salmonella in 25g (5 samples). Many buyers require additional Salmonella testing beyond the minimum regulatory requirement.

Allergen status: Sesame is a declared allergen under EU Regulation 1169/2011. Cross-contamination controls and accurate labelling are mandatory. Manufacturers using sesame in shared facilities must have validated allergen cleaning protocols.

Hulled vs Unhulled: Processing, Nutrition, and Applications

Hulling methods matter for natural-label positioning. Mechanical hulling uses friction or abrasion to remove the seed coat. Chemical hulling soaks seeds in a sodium hydroxide (NaOH/lye) solution to dissolve the hull, then rinses thoroughly. Mechanically hulled sesame has a premium price and is preferred by manufacturers making natural-label claims. Always confirm the hulling method with your supplier.

COA Parameters for Sesame Procurement

• Moisture: Maximum 5–6%. Higher moisture promotes mould and aflatoxin development.
• Oil content: 48–55% depending on variety and hull status. Important for tahini manufacturers where oil content directly affects yield.
• FFA (free fatty acids): Maximum 1.5–2.0%. Indicates freshness; higher FFA means older or improperly stored seeds.
• Ethylene oxide residue: For food additives specifically, the EU amended Regulation (EU) No 231/2012 through (EU) 2022/1396, setting a maximum of 0.1 mg/kg. For food commodities, MRLs under Regulation (EC) 396/2005 apply and are often stricter (as low as 0.02 mg/kg).
• Salmonella: Absent in 25g (n=5). Many buyers require n=10 or n=20 sampling plans for higher confidence.
• Aflatoxin: Maximum 4 µg/kg B1, 10 µg/kg total (EU limits). Important for origins with warm, humid storage conditions.
• Purity/foreign matter: Maximum 0.5–1.0% foreign matter (other seeds, sand, stones). Machine-cleaned sesame should meet 99%+ purity.

Sourcing Questions

What is mechanically hulled sesame?

Mechanically hulled sesame has its outer seed coat removed by friction or abrasion rather than chemical soaking. It is preferred for natural-label products because no chemical processing aids (like sodium hydroxide) are used. Mechanically hulled seeds may retain slightly more colour variation compared to chemically hulled.

Why is sesame flagged so often in RASFF?

Two reasons: ethylene oxide residues from fumigation (banned in the EU but used in some origin countries) and Salmonella contamination. India, the world’s largest sesame exporter, has been the primary origin for EtO-related RASFF alerts since 2020.

Is black sesame a different variety?

Black sesame seeds are unhulled seeds from specific Sesamum indicum cultivars with naturally dark seed coats. They have a slightly different flavour profile (more intense, slightly bitter) and are primarily used in Asian bakery, confectionery, and as a garnish. Black sesame oil is a premium product in East Asian cuisine.

What is the shelf life of bulk sesame seeds?

Properly stored sesame seeds (below 6% moisture, cool, dry conditions) maintain quality for 12–18 months. Due to high oil content, sesame is susceptible to oxidative rancidity, monitor peroxide value in stored inventory and use FIFO rotation.

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