{"id":356,"date":"2026-03-28T10:34:27","date_gmt":"2026-03-28T15:34:27","guid":{"rendered":"https:\/\/tehnologam.com\/en\/?p=356\/"},"modified":"2026-03-28T10:34:27","modified_gmt":"2026-03-28T15:34:27","slug":"e223-sodium-metabisulfite","status":"publish","type":"post","link":"https:\/\/tehnologam.com\/en\/e223-sodium-metabisulfite\/","title":{"rendered":"E223 Sodium Metabisulfite"},"content":{"rendered":"<p><strong>Sodium metabisulfite<\/strong> (also known as sodium pyrosulfite) is a food additive classified as <strong>E223<\/strong>. It serves multiple technological functions: as a preservative that inhibits microbial growth, as a flour improver that relaxes gluten by releasing free sulfur during thermal decomposition, and as a leavening aid in certain applications.<\/p>\n<h2>Physical and chemical properties<\/h2>\n<p>Chemical formula: Na\u2082S\u2082O\u2085 (or Na\u2082(SO\u2082\u00b7SO\u2083)). CAS number: 7681-57-4. Appearance: white or light yellow crystalline powder. Melting point: 150 \u00b0C. Water solubility: 540 g\/L at 20 \u00b0C \u2014 highly soluble, making it easy to incorporate into liquid-based food systems.<\/p>\n<h2>Applications and dosage<\/h2>\n<p>Sodium metabisulfite is used across a wide range of food products. Typical permitted dosages include:<\/p>\n<ul>\n<li><strong>Grape juice<\/strong> \u2014 up to 6 mg\/L<\/li>\n<li><strong>Fruit juices for beverages<\/strong> \u2014 up to 100 mg\/L<\/li>\n<li><strong>Wines (grape, semi-sweet, fruit)<\/strong> \u2014 200\u2013400 mg\/L<\/li>\n<li><strong>Cider<\/strong> \u2014 up to 150 mg\/L<\/li>\n<li><strong>Marmalade, pastilles, marshmallow, jams<\/strong> \u2014 up to 20 mg\/kg<\/li>\n<li><strong>Peeled potato (anti-browning treatment)<\/strong> \u2014 20 mg\/kg raw, 2 mg\/kg cooked<\/li>\n<li><strong>Dried potato and cabbage<\/strong> \u2014 up to 400 mg\/kg<\/li>\n<li><strong>Dried fruits (subject to heat treatment)<\/strong> \u2014 up to 1,000 mg\/kg<\/li>\n<li><strong>Berry semi-finished products<\/strong> \u2014 1,500\u20133,000 mg\/kg<\/li>\n<\/ul>\n<p>In addition to these dosage limits, most products are subject to a residual SO\u2082 limit in the finished product, which must comply with national food safety regulations.<\/p>\n<h2>Safety considerations<\/h2>\n<p>Sodium metabisulfite can cause allergic reactions in sensitive individuals, particularly asthmatics. Workers handling the pure substance should avoid inhalation of dust and contact with skin and eyes. The sulfur dioxide released during processing has a characteristic sharp odor and can irritate the respiratory tract at high concentrations.<\/p>\n<p>Find more information about <strong><a href=\"\/key-words\/food-additives\/\">food additives<\/a><\/strong> and preservatives in the articles below.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sodium metabisulfite (also known as sodium pyrosulfite) is a food additive classified as E223. It serves multiple technological functions: as a preservative that inhibits microbial growth, as a flour improver that relaxes gluten by releasing free sulfur during thermal decomposition, and as a leavening aid in certain applications. Physical and chemical properties Chemical formula: Na\u2082S\u2082O\u2085&hellip;&nbsp;<a href=\"https:\/\/tehnologam.com\/en\/e223-sodium-metabisulfite\/\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">E223 Sodium Metabisulfite<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[26],"tags":[182,32,123,183],"class_list":["post-356","post","type-post","status-publish","format-standard","hentry","category-handbook","tag-e-number","tag-flour-improver","tag-food-additives","tag-preservative"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>E223 Sodium Metabisulfite - Properties, Dosage &amp; Safety<\/title>\n<meta name=\"description\" content=\"Sodium metabisulfite (E223) is a preservative and flour improver. 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