Sunflower Seeds
Stub page. Contamination profile populates on the next ingest wave. Sunflower seeds are identified by EFSA Cd 2009 within the “oilseeds” category, which ranks among the highest-cadmium food categories in the EFSA European occurrence dataset. Sunflower is itself a well-documented efficient cadmium accumulator, to the point of being studied as a phytoremediation candidate for cadmium-contaminated soils.
Why this commodity accumulates cadmium
Sunflower (Helianthus annuus) is one of several crop species with documented efficient cadmium uptake from soil, sufficiently so that the species has been investigated as a phytoremediation tool for cadmium-contaminated agricultural and industrial soils. The cadmium taken up by the plant partitions preferentially to the seeds, concentrating in the protein-rich seed tissue rather than staying in stems, leaves, or roots. Regional variation in finished-seed cadmium reflects the soil cadmium at the growing site, and cadmium levels in sunflower seeds from cadmium-rich soils can be materially higher than in seeds from lower-cadmium regions.
Ranges by source, region, and variety
Pending ingest of commodity-level occurrence data. EFSA 2009 Table 1 reports a mean cadmium concentration for oil seeds of 0.227 mg/kg, placing the oilseed category fifth-highest in the EFSA ranking of food commodity means by cadmium concentration. Sunflower-specific values within the oilseed category are expected to be at the upper end given the species’ accumulator profile; confirmation requires dedicated commodity-level ingests.
Processing effects
Pending. Cadmium in sunflower seeds partitions primarily to the protein fraction rather than to the oil fraction during cold-pressing, so sunflower oil typically carries less cadmium than whole seeds by a substantial factor; the press cake (oilseed meal) concentrates the cadmium remaining after oil extraction and is used in animal feed and in some plant-protein products.
Ingredient-derivative risk
Sunflower oil is a relatively low-cadmium derivative because cadmium partitions to the protein-rich press cake during oil extraction. Sunflower meal, sunflower protein concentrate, and sunflower butter (which retains the whole seed) carry cadmium at or above the whole-seed concentration. Plant-based protein products using sunflower protein as a primary ingredient deserve per-product characterization; the concentrating effect of protein isolation can produce derivative products with notably elevated cadmium.
Mitigation options
Pending. Cultivar selection, soil management, and choice of growing region are the primary mitigation levers on the production side. For downstream processors, sourcing from documented lower-cadmium growing regions and choosing oil over meal in formulation are the primary options.
Other metals of concern
Pending dedicated Pb, iAs, tHg, Ni, and Al ingest waves. The contamination_profile YAML block tracks all six metals; commodity-specific narrative for non-cadmium metals will populate when the corresponding source pages are ingested.
Regulatory limits that apply
- codex-cadmium-mls — Codex matrix-level Cd ML for oilseeds (pending ingest of CXS 193-1995).
- eu-2023-915-cadmium — EU Cd maximum level for linseeds and sunflower seeds is 0.50 mg/kg (500 ug/kg); oilseeds generally are 0.10 mg/kg (100 ug/kg), with separate rows for rape seed, peanuts/soybeans, mustard seed, and poppy seed.
Sources
Auto-generated from source-page frontmatter. The “Used on this page for” column is populated by the orchestrator’s POPULATE-SOURCE-LEGEND action; pending entries appear as *[awaiting synthesis]*.
| # | Citation | Year | Type | Used on this page for |
|---|---|---|---|---|
| 1 | Fu et al. 2022. Physiological and Transcriptomic Comparison of Two Sunflower (Helianthus annuus L.) Cultivars With High/Low Cadmium Accumulation, Frontiers in Plant Science | 2022 | Peer-reviewed | Hydroponic Cd stress comparison of two sunflower cultivars; documents cultivar-level variation in root-to-shoot Cd translocation and the NRAMP gene-family driver |
| 2 | Nordberg et al. 2015. Cadmium (Chapter 32), in Handbook on the Toxicology of Metals, Fourth Edition, Volume II: Specific Metals, Academic Press / Elsevier, Amsterdam | 2015 | Textbook chapter | Canonical Cd toxicology chapter identifying sunflower seeds as elevated-Cd oilseeds due to root-soil uptake; Cd partitioning to protein fraction during oil extraction |
| 3 | EFSA 2009. Scientific Opinion of the Panel on Contaminants in the Food Chain on a request from the European Commission on cadmium in food, The EFSA Journal | 2009 | Government report | EFSA CONTAM Cd opinion; sunflower seeds (alongside peanuts) identified as a high-Cd oilseed in the European occurrence dataset |