{ "$schema": "https://foodadditiveindex.com/api/v1/schema.json", "id": "https://foodadditiveindex.com/additives/potassium-metabisulfite", "slug": "potassium-metabisulfite", "name": "Potassium metabisulfite", "identifiers": { "e_number": "E224", "ins_number": "224", "cas_number": "16731-55-8", "inchikey": "RWPGFSMJFRPDDP-UHFFFAOYSA-L", "pubchem_cid": 28019 }, "functional_class": "Preservative", "summary": "Potassium metabisulfite is the sulfite most used in winemaking, where it prevents oxidation and suppresses unwanted yeasts. 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"source": "gsfa", "retrieved_at": "2026-09-07T07:54:15.059Z" }, { "status": "permitted_with_conditions", "food_category": { "system": "codex", "code": "04.2.2.3", "name": "Vegetables (including mushrooms and fungi, roots and tubers, pulses and legumes, and aloe vera), and seaweeds in vinegar, oil, brine, or soybean sauce" }, "max_level": 100, "max_level_unit": "mg/kg", "conditions": "GSFA notes: 44", "effective_from": "2006", "citation": { "ref": "CXS 192-1995 Table One, INS 224, food category 04.2.2.3", "url": "https://www.fao.org/fao-who-codexalimentarius/codex-texts/dbs/gsfa/en/" }, "source": "gsfa", "retrieved_at": "2026-09-07T07:54:15.059Z" }, { "status": "permitted_with_conditions", "food_category": { "system": "codex", "code": "04.2.2.4", "name": "Canned or bottled (pasteurized) or retort pouch vegetables (including mushrooms and fungi, roots and tubers, pulses and legumes, and aloe vera), and seaweeds" }, "max_level": 50, "max_level_unit": "mg/kg", "conditions": "GSFA notes: 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