- Identity
- Visual and microscopic identification of Undaria pinnatifida and freedom from other seaweeds.
- Iodine
- Iodine content by ICP-MS or titration, which varies widely with site, season and processing.
- Heavy metals
- Lead, cadmium, mercury, and total and inorganic arsenic by ICP-MS; brown seaweeds can carry inorganic arsenic.
- Moisture and salt
- Loss on drying for dried cuts, and sodium chloride for salted product.
- Microbiology
- Total plate count, yeast and mold, E. coli and Salmonella, plus Listeria for chilled salted product.
- Foreign matter
- Shell, sand and small marine organisms from rope farming.