{"id":100252,"date":"2026-05-02T05:35:43","date_gmt":"2026-05-02T03:35:43","guid":{"rendered":"https:\/\/medqmedicalsuppliers.co.za\/?post_type=product&#038;p=100252"},"modified":"2026-05-02T05:35:51","modified_gmt":"2026-05-02T03:35:51","slug":"congo-red-indicator-2","status":"publish","type":"product","link":"https:\/\/medqmedicalsuppliers.co.za\/?product=congo-red-indicator-2","title":{"rendered":"Congo Red Indicator"},"content":{"rendered":"<p>Congo Red Indicator<\/p>\n<p>Congo Red is a versatile, anionic diazo dye used primarily as a histological stain to detect amyloid deposits (showing apple-green birefringence under polarized light) and as a pH indicator (blue at pH 3.0, red at pH 5.2). It is also applied in microbiology for cell wall staining, in industrial dyeing (cotton\/cellulose), and in research for studying protein aggregation.<br \/> Congo Red Indicator<\/p>\n<p>Key Uses and Applications<br \/> Medical &amp; Histological Diagnosis: The \ufffd\ufffd\ufffdgold standard\ufffd\ufffd\ufffd for detecting amyloidosis, where it stains amyloid proteins in tissues (liver, kidney, heart) to produce a characteristic apple-green birefringence under polarized light.<br \/> pH Indicator: Used in laboratories to detect acidic changes, with a color transition from blue (pH 3.0) to red (pH 5.2).<br \/> Microbiology &amp; Cell Biology: Used to visualize cell walls in fungi and plants, and to identify Gram-negative bacteria.<br \/> Biofilm Detection: Utilized in Congo Red Agar media to identify the ability of microbes to form biofilms.<br \/> Research (Protein Aggregation): Applied in studies regarding Alzheimer\ufffd\ufffd\ufffds, Creutzfeldt-Jakob disease, and other neurodegenerative diseases.<br \/> Industrial Dyeing: Historically used for dyeing cotton, paper, and leather, though its use has declined due to toxicity.<br \/> Medical Diagnostic Tests: Used in a urine test to detect preeclampsia in pregnant women. <\/p>\n<p>Properties<br \/> Solubility: Soluble in water, better in ethanol.<br \/> Structure: Symmetrical diazo dye.<br \/> Hazard: Known to be toxic and carcinogenic, requiring careful handling.<br \/> Congo Red Indicator<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Congo Red Indicator<\/p>\n<p>Congo Red is a versatile, anionic diazo dye used primarily as a histological stain to detect amyloid deposits (showing apple-green birefringence under polarized light) and as a pH indicator (blue at pH 3.0, red at pH 5.2). It is also applied in microbiology for cell wall staining, in industrial dyeing (cotton\/cellulose), and in research for studying protein aggregation.<br \/> Congo Red Indicator<\/p>\n<p>Key Uses and Applications<br \/> Medical &amp; Histological Diagnosis: The \ufffd\ufffd\ufffdgold standard\ufffd\ufffd\ufffd for detecting amyloidosis, where it stains amyloid proteins in tissues (liver, kidney, heart) to produce a characteristic apple-green birefringence under polarized light.<br \/> pH Indicator: Used in laboratories to detect acidic changes, with a color transition from blue (pH 3.0) to red (pH 5.2).<br \/> Microbiology &amp; Cell Biology: Used to visualize cell walls in fungi and plants, and to identify Gram-negative bacteria.<br \/> Biofilm Detection: Utilized in Congo Red Agar media to identify the ability of microbes to form biofilms.<br \/> Research (Protein Aggregation): Applied in studies regarding Alzheimer\ufffd\ufffd\ufffds, Creutzfeldt-Jakob disease, and other neurodegenerative diseases.<br \/> Industrial Dyeing: Historically used for dyeing cotton, paper, and leather, though its use has declined due to toxicity.<br \/> Medical Diagnostic Tests: Used in a urine test to detect preeclampsia in pregnant women. <\/p>\n<p>Properties<br \/> Solubility: Soluble in water, better in ethanol.<br \/> Structure: Symmetrical diazo dye.<br \/> Hazard: Known to be toxic and carcinogenic, requiring careful handling.<br \/> Congo Red Indicator<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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