{"id":14000,"date":"2026-06-03T01:11:37","date_gmt":"2026-06-03T01:11:37","guid":{"rendered":"https:\/\/glabridinchina.com\/?p=14000"},"modified":"2026-06-10T01:33:33","modified_gmt":"2026-06-10T01:33:33","slug":"why-does-glabridin-discolor-in-emulsions-huatai-bio-fine-chemical","status":"publish","type":"post","link":"https:\/\/glabridinchina.com\/fr\/why-does-glabridin-discolor-in-emulsions-huatai-bio-fine-chemical\/","title":{"rendered":"Pourquoi la glabridine se d\u00e9colore-t-elle dans les \u00e9mulsions ?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"14000\" class=\"elementor elementor-14000\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5f448bd e-flex e-con-boxed e-con e-parent\" data-id=\"5f448bd\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8cff18e elementor-widget elementor-widget-html\" data-id=\"8cff18e\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t   <script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntityOfPage\": {\n        \"@type\": \"WebPage\",\n        \"@id\": \"https:\\\/\\\/glabridinchina.com\\\/faq\\\/why-does-glabridin-discolor-in-emulsions\\\/\"\n    },\n    \"about\": {\n        \"@type\": \"ChemicalSubstance\",\n        \"name\": \"Glabridin\",\n        \"alternateName\": \"\\u5149\\u7518\\u8349\\u5b9a\"\n    },\n    \"publisher\": {\n        \"@type\": \"Organization\",\n        \"name\": \"Huatai Bio-Fine Chemical\",\n        \"url\": \"https:\\\/\\\/glabridinchina.com\"\n    },\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why does glabridin discolor in emulsions?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Glabridin discoloration in emulsions is generally associated with oxidative degradation of its polyphenolic structure. Contributing factors include trace transition metal ions (such as Fe\\u00b2\\u207a and Cu\\u00b2\\u207a), light exposure, elevated pH, and oxidative conditions. Formulation yellowing is an oxidative stability issue \\u2014 it is not caused by raw material color, which in brown grades is inherent to the botanical extraction matrix.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the most common cause of glabridin discoloration in emulsions?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The most common cause is trace metal ion contamination \\u2014 specifically Fe\\u00b2\\u207a and Cu\\u00b2\\u207a \\u2014 which catalyzes oxidative chain reactions on glabridin's phenolic hydroxyl groups, generating chromophoric by-products that progressively shift formula color toward yellow and amber. Sources include process water, plant-derived co-ingredients, stainless steel equipment, and pigments. Metal chelation (disodium EDTA at 0.05\\u20130.1%, or sodium phytate for clean-label systems) is the primary chemical defense.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does alkaline pH cause glabridin to discolor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Above pH 7.0, glabridin's phenolic hydroxyl groups deprotonate more readily to form phenoxide anions, significantly increasing oxidative sensitivity and accelerating radical-mediated oxidative degradation. This process generates conjugated oxidation products, manifesting as progressive color deepening accompanied by active content loss. This degradation is non-linear and accelerates significantly above pH 7.0. The optimal stability range is pH 4.0\\u20135.5; up to pH 6.5 is acceptable with close monitoring.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I prevent glabridin discoloration in emulsions?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Prevention requires three parallel interventions: (1) antioxidant protection \\u2014 tocopherol at 0.2\\u20130.5% in the oil phase, supplemented by BHT or rosemary extract; (2) metal chelation \\u2014 disodium EDTA at 0.05\\u20130.1%, or sodium phytate for clean-label systems; (3) pH control \\u2014 maintain final formulation pH at 4.0\\u20135.5. Packaging selection is also critical: airless pumps and UV-blocking containers significantly extend finished product stability.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is discoloration in glabridin raw material a sign of degradation?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Not necessarily. The 40% reddish-brown grade and concentrated liquid grades are brown by nature \\u2014 this reflects the botanical extraction matrix and is not a quality defect. Confirm with HPLC if uncertain; active content will be within specification. Formula yellowing during storage, by contrast, is a separate oxidative stability issue caused by degradation of the active in the finished product.\"\n            }\n        }\n    ]\n}<\/script>\n  <style>\n    :root {\n      --color-bg:         #fafaf8;\n      --color-surface:    #ffffff;\n      --color-border:     #e8e4dc;\n      --color-text:       #1a1a18;\n      --color-text-muted: #6b6860;\n      --color-accent:     #2d5a3d;\n      --color-accent-light: #edf4ef;\n      --color-accent-mid: #4a7c5f;\n      --color-warn:       #7a4f1e;\n      --color-warn-light: #fdf4eb;\n      --color-data-bg:    #f4f2ee;\n      --font-heading:     'Lora', Georgia, serif;\n      --font-body:        'Source Sans 3', sans-serif;\n      --max-width:        780px;\n      --radius:           6px;\n    }\n\n    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n    html { scroll-behavior: smooth; }\n\n    body {\n      font-family: var(--font-body);\n      font-size: 17px;\n      line-height: 1.75;\n      color: var(--color-text);\n      background: var(--color-bg);\n    }\n\n    \/* \u2500\u2500 Layout \u2500\u2500 *\/\n    .page-wrap {\n      max-width:100%;\n      margin: 0 auto;\n      padding: 0 24px 80px;\n    }\n\n    \/* \u2500\u2500 Header \u2500\u2500 *\/\n    .site-header {\n      border-bottom: 1px solid var(--color-border);\n      padding: 18px 24px;\n      display: flex;\n      align-items: center;\n      gap: 12px;\n      max-width: 100%;\n    }\n    .site-header .brand {\n      font-family: var(--font-heading);\n      font-size: 15px;\n      font-weight: 600;\n      color: var(--color-accent);\n      text-decoration: none;\n      letter-spacing: 0.01em;\n    }\n    .site-header .sep { color: var(--color-border); 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}\n\n    \/* \u2500\u2500 Footer note \u2500\u2500 *\/\n    .article-footer {\n      margin-top: 40px;\n      padding-top: 20px;\n      border-top: 1px solid var(--color-border);\n      font-size: 13px;\n      color: var(--color-text-muted);\n      line-height: 1.6;\n    }\n  <\/style>\n<\/head>\n<body>\n  <div class=\"page-wrap\">\n\n    <!-- Article header -->\n    <header class=\"article-header\">\n      <div class=\"tag-row\">\n        <span class=\"tag\">FAQ<\/span>\n        <span class=\"tag secondary\">Glabridine<\/span>\n        <span class=\"tag secondary\">Stabilit\u00e9 de la formulation<\/span>\n      <\/div>\n      <p class=\"article-intro\">La d\u00e9coloration de la glabridine dans les \u00e9mulsions est g\u00e9n\u00e9ralement associ\u00e9e \u00e0 la d\u00e9gradation oxydative de sa structure polyph\u00e9nolique. Les traces d'ions de m\u00e9taux de transition (tels que Fe\u00b2\u207a et Cu\u00b2\u207a), l'exposition \u00e0 la lumi\u00e8re, un pH \u00e9lev\u00e9 et des conditions oxydatives peuvent tous acc\u00e9l\u00e9rer ce processus. L'identification du principal facteur de d\u00e9gradation dans votre formulation sp\u00e9cifique est le pr\u00e9requis pour une strat\u00e9gie de stabilisation efficace.<\/p>\n      <div class=\"byline\">\n        <span><strong>Huatai Bio-Fine Chemical<\/strong> \u2014 fabricant d'actifs cosm\u00e9tiques de haute puret\u00e9 depuis 2008<\/span>\n        <span class=\"byline-dot\">\u00b7<\/span>\n        <span>Publi\u00e9 2026<\/span>\n      <\/div>\n    <\/header>\n\n    <!-- Article body -->\n    <article class=\"article-body\">\n\n      <h2>Les trois m\u00e9canismes de d\u00e9gradation \u00e0 l'origine de la d\u00e9coloration<\/h2>\n\n      <!-- Mechanism 1 -->\n      <h3><span class=\"h3-num\">1<\/span>Oxydation catalys\u00e9e par les ions m\u00e9talliques \u2014 la cause la plus fr\u00e9quente<\/h3>\n\n      <p>La structure isoflavane de la glabridine contient deux groupes hydroxyles ph\u00e9noliques tr\u00e8s sensibles aux r\u00e9actions en cha\u00eene oxydatives catalys\u00e9es par les m\u00e9taux. Les traces de Fe\u00b2\u207a et de Cu\u00b2\u207a peuvent catalyser l'oxydation de la glabridine, acc\u00e9l\u00e9rant la formation de sous-produits chromophores qui font passer progressivement la couleur de la formule du blanc ou de la cr\u00e8me vers le jaune, l'ambre et finalement le brun.<\/p>\n\n      <p>Les sources de contamination par traces de m\u00e9taux dans la production d'\u00e9mulsions sont souvent n\u00e9glig\u00e9es :<\/p>\n      <ul>\n        <li><strong>Eau municipale ou d\u00e9min\u00e9ralis\u00e9e<\/strong> avec une teneur r\u00e9siduelle en min\u00e9raux<\/li>\n        <li><strong>Co-ingr\u00e9dients d'origine v\u00e9g\u00e9tale<\/strong> (extraits botaniques, huiles v\u00e9g\u00e9tales) qui contiennent des m\u00e9taux naturels<\/li>\n        <li><strong>\u00c9quipement de traitement en acier inoxydable<\/strong> qui lib\u00e8re des traces de fer dans des conditions l\u00e9g\u00e8rement acides<\/li>\n        <li><strong>Pigments de dioxyde de titane ou d'oxyde de fer<\/strong> utilis\u00e9s dans les formulations teint\u00e9es<\/li>\n      <\/ul>\n\n      <div class=\"callout\">\n        <p>Dans les tests de stabilit\u00e9 acc\u00e9l\u00e9r\u00e9e (selon les conditions acc\u00e9l\u00e9r\u00e9es de la norme ICH Q1A(R2) : 40\u00b0C \/ 75% HR), les \u00e9mulsions sans agent ch\u00e9lateur pr\u00e9sentent un d\u00e9veloppement de couleur (d\u00e9calage \u0394b* mesurable) en 2 \u00e0 4 semaines, m\u00eame lorsque le pH et les antioxydants sont bien contr\u00f4l\u00e9s. La ch\u00e9lation des m\u00e9taux n'est pas facultative \u2014 c'est la principale d\u00e9fense chimique contre la d\u00e9coloration oxydative.<\/p>\n      <\/div>\n\n      <!-- Chart 2 - oxidative -->\n      <figure class=\"figure\">\n        <img decoding=\"async\" src=\"https:\/\/glabridinchina.com\/wp-content\/uploads\/2026\/06\/glabridin_chart2_oxidative_stability.png\"\n             alt=\"Diagramme en barres montrant la diminution de la concentration de glabridine avec l&#039;augmentation des concentrations de H\u2082O\u2082 de 1 \u00e0 6\">\n        <figcaption>Fig. 1 \u2014 D\u00e9gradation de la glabridine sous stress oxydatif (H\u2082O\u2082). La diminution progressive de la concentration avec l'augmentation du niveau d'oxydant confirme le r\u00f4le des m\u00e9canismes oxydatifs dans la d\u00e9coloration. Donn\u00e9es : Ao et al., <em>Natural Product Communications<\/em>, 2010.<\/figcaption>\n      <\/figure>\n\n      <!-- Mechanism 2 -->\n      <h3><span class=\"h3-num\">2<\/span>D\u00e9gradation photo-oxydative par UV et lumi\u00e8re<\/h3>\n\n      <p>Ao et al. (<em>Natural Product Communications<\/em>, 2010) ont identifi\u00e9 l'\u00e9clairage comme le principal facteur affectant la stabilit\u00e9 de la glabridine, la lumi\u00e8re naturelle et la lumi\u00e8re UV provoquant une d\u00e9gradation mesurable en quelques heures dans des conditions contr\u00f4l\u00e9es :<\/p>\n\n      <div class=\"table-wrap\">\n        <table>\n          <thead>\n            <tr>\n              <th>Condition d'\u00e9clairage<\/th>\n              <th>Exposition<\/th>\n              <th>D\u00e9gradation<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td>Stockage \u00e0 l'obscurit\u00e9<\/td>\n              <td>24 heures<\/td>\n              <td>Pas de changement significatif<\/td>\n            <\/tr>\n            <tr>\n              <td>Lumi\u00e8re naturelle<\/td>\n              <td>8 heures<\/td>\n              <td><strong>D\u00e9gradation mesurable<\/strong><\/td>\n            <\/tr>\n            <tr>\n              <td>Lumi\u00e8re UV<\/td>\n              <td>8 heures<\/td>\n              <td><strong>D\u00e9gradation plus importante que la lumi\u00e8re naturelle<\/strong><\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <!-- Chart 1 - light stability -->\n      <figure class=\"figure\">\n        <img decoding=\"async\" src=\"https:\/\/glabridinchina.com\/wp-content\/uploads\/2026\/06\/glabridin_chart1_light_stability.png\"\n             alt=\"Diagramme lin\u00e9aire montrant la concentration de glabridine sur 24 heures dans des conditions de stockage \u00e0 l&#039;obscurit\u00e9, sous lumi\u00e8re UV et sous lumi\u00e8re naturelle\">\n        <figcaption>Fig. 2 \u2014 D\u00e9gradation de la glabridine sous diff\u00e9rentes conditions d'\u00e9clairage sur 24 heures. Le stockage \u00e0 l'obscurit\u00e9 maintient la concentration ; la lumi\u00e8re UV et la lumi\u00e8re naturelle provoquent une d\u00e9gradation progressive, la lumi\u00e8re UV montrant une perte plus importante et plus variable. Donn\u00e9es : Ao et al., <em>Natural Product Communications<\/em>, 2010.<\/figcaption>\n      <\/figure>\n\n      <p>Une exposition prolong\u00e9e \u00e0 la lumi\u00e8re naturelle ou aux UV peut entra\u00eener une d\u00e9gradation de la glabridine ; les sous-produits oxydatifs form\u00e9s lors de ce processus peuvent contribuer \u00e0 un approfondissement de la couleur dans la formulation. L'emballage bloquant la lumi\u00e8re est donc une consid\u00e9ration importante pour les produits finis contenant de la glabridine.<\/p>\n\n      <!-- Mechanism 3 -->\n      <h3><span class=\"h3-num\">3<\/span>D\u00e9gradation oxydative induite par les alcalins \u2014 Un probl\u00e8me de gestion du pH<\/h3>\n\n      <p>Au-dessus de pH 7,0, les groupes hydroxyles ph\u00e9noliques de la glabridine se d\u00e9protonent plus facilement pour former des anions ph\u00e9noxydes, augmentant consid\u00e9rablement la sensibilit\u00e9 \u00e0 l'oxydation et acc\u00e9l\u00e9rant la d\u00e9gradation oxydative m\u00e9di\u00e9e par les radicaux. Ce processus g\u00e9n\u00e8re des produits d'oxydation conjugu\u00e9s, se manifestant par un approfondissement progressif de la couleur accompagn\u00e9 d'une perte de teneur active.<\/p>\n\n      <!-- Chart 3 - pH stability -->\n      <figure class=\"figure\">\n        <img decoding=\"async\" src=\"https:\/\/glabridinchina.com\/wp-content\/uploads\/2026\/06\/glabridin_chart3_pH_stability.png\"\n             alt=\"Diagramme en courbes montrant la concentration de glabridine sur un pH de 1 \u00e0 13, avec un plateau stable \u00e0 un pH de 1 \u00e0 6 et un d\u00e9clin marqu\u00e9 au-dessus d&#039;un pH de 7\">\n        <figcaption>Fig. 3 \u2014 Effet du pH sur la stabilit\u00e9 de la glabridine. La concentration reste stable entre pH 1 et 6, puis diminue fortement au-dessus de pH 7. \u00c0 pH 13, la concentration tombe \u00e0 environ 7 \u00b5g\/mL \u2014 une perte de plus de 70%. Donn\u00e9es : Ao et al., <em>Natural Product Communications<\/em>, 2010.<\/figcaption>\n      <\/figure>\n\n      <p>Cette d\u00e9gradation est non lin\u00e9aire : une formulation \u00e0 pH 7,5 se d\u00e9grade de mani\u00e8re mesurable plus rapidement qu'une formulation \u00e0 pH 5,5 dans des tests acc\u00e9l\u00e9r\u00e9s. Pour les formulateurs, l'erreur critique est de ne pas mesurer le pH <em>apr\u00e8s<\/em> toutes les additions de refroidissement sont termin\u00e9es. La glabridine elle-m\u00eame, ainsi que les co-actifs ajout\u00e9s dans la m\u00eame phase, peuvent faire passer une formule de base \u00e0 pH 6,0 au-dessus de 7,0, d\u00e9clenchant ainsi la d\u00e9gradation m\u00eame que le pH de base \u00e9tait con\u00e7u pour pr\u00e9venir.<\/p>\n\n      <div class=\"callout warning\">\n        <p><strong>Note de formulation critique :<\/strong> Toujours mesurer le pH final <em>apr\u00e8s<\/em> toutes les additions de refroidissement sont termin\u00e9es. Une seule v\u00e9rification du pH avant la phase d'ajout des actifs est insuffisante.<\/p>\n      <\/div>\n\n      <!-- Stabilization protocol -->\n      <h2>Comment y rem\u00e9dier : un protocole de stabilisation \u00e0 trois couches<\/h2>\n\n      <!-- Layer 1 -->\n      <div class=\"protocol-layer\">\n        <div class=\"protocol-layer-header\">\n          <span class=\"layer-badge\">1<\/span>\n          Protection antioxydante\n        <\/div>\n        <div class=\"table-wrap\">\n          <table>\n            <thead>\n              <tr>\n                <th>Antioxydant<\/th>\n                <th>Niveau d'utilisation<\/th>\n                <th>Notes<\/th>\n              <\/tr>\n            <\/thead>\n            <tbody>\n              <tr>\n                <td><strong>Tocoph\u00e9rol (m\u00e9lang\u00e9)<\/strong><\/td>\n                <td>0,21 % \u2013 0,51 %<\/td>\n                <td>Antioxydant principal de la phase lipidique ; incorporer dans la phase huileuse<\/td>\n              <\/tr>\n              <tr>\n                <td>BHT<\/td>\n                <td>0,02 % \u2013 0,1 %<\/td>\n                <td>Tr\u00e8s efficace ; \u00e9valuer par rapport au positionnement \"clean label\"<\/td>\n              <\/tr>\n              <tr>\n                <td>Extrait de romarin<\/td>\n                <td>0,05 % \u2013 0,2 %<\/td>\n                <td>Alternative naturelle compatible COSMOS<\/td>\n              <\/tr>\n              <tr>\n                <td>Palmitate d'ascorbyle<\/td>\n                <td>0,05 % \u2013 0,1 %<\/td>\n                <td>D\u00e9riv\u00e9 de vitamine C liposoluble ; synergise avec le tocoph\u00e9rol<\/td>\n              <\/tr>\n            <\/tbody>\n          <\/table>\n        <\/div>\n        <p class=\"protocol-note\">La combinaison tocoph\u00e9rol + BHT offre la protection la plus robuste lors des tests de stabilit\u00e9 acc\u00e9l\u00e9r\u00e9s. Pour les formulations naturelles certifi\u00e9es, remplacer le BHT par un extrait de romarin.<\/p>\n      <\/div>\n\n      <!-- Layer 2 -->\n      <div class=\"protocol-layer\">\n        <div class=\"protocol-layer-header\">\n          <span class=\"layer-badge\">2<\/span>\n          Ch\u00e9lation des m\u00e9taux\n        <\/div>\n        <div class=\"table-wrap\">\n          <table>\n            <thead>\n              <tr>\n                <th>Ch\u00e9lateur<\/th>\n                <th>Niveau d'utilisation<\/th>\n                <th>Notes<\/th>\n              <\/tr>\n            <\/thead>\n            <tbody>\n              <tr>\n                <td><strong>EDTA disodique<\/strong><\/td>\n                <td>0,05 % \u2013 0,1 %<\/td>\n                <td>Standard\u00a0; tr\u00e8s efficace dans tous les types d'eau<\/td>\n              <\/tr>\n              <tr>\n                <td>Phytate de sodium<\/td>\n                <td>0,1%\u20130,5%<\/td>\n                <td>Naturel, compatible COSMOS\u00a0; \u00e9galement b\u00e9n\u00e9fique pour la peau<\/td>\n              <\/tr>\n              <tr>\n                <td>Gluconate de sodium<\/td>\n                <td>0,1\u00a0%\u20130,3\u00a0%<\/td>\n                <td>Doux ; pour les formulations \u00e0 additifs minimaux<\/td>\n              <\/tr>\n            <\/tbody>\n          <\/table>\n        <\/div>\n        <p class=\"protocol-note\">La ch\u00e9lation des m\u00e9taux est non n\u00e9gociable, m\u00eame dans les formulations naturelles. Les ions de m\u00e9taux de transition traces pr\u00e9sentent une activit\u00e9 catalytique significative dans les syst\u00e8mes polyph\u00e9noliques\u00a0; leur impact est \u00e9troitement li\u00e9 \u00e0 la concentration et \u00e0 l'environnement de formulation.<\/p>\n      <\/div>\n\n      <!-- Layer 3 -->\n      <div class=\"protocol-layer\">\n        <div class=\"protocol-layer-header\">\n          <span class=\"layer-badge\">3<\/span>\n          Contr\u00f4le du pH\n        <\/div>\n        <div class=\"table-wrap\">\n          <table>\n            <thead>\n              <tr>\n                <th>Gamme de pH<\/th>\n                <th>Stabilit\u00e9<\/th>\n                <th>Recommandation<\/th>\n              <\/tr>\n            <\/thead>\n            <tbody>\n              <tr>\n                <td><strong>4,0\u20135,5<\/strong><\/td>\n                <td><strong>Optimal<\/strong><\/td>\n                <td>Plage cible<\/td>\n              <\/tr>\n              <tr>\n                <td>5,5\u20136,5<\/td>\n                <td>Bien<\/td>\n                <td>Acceptable<\/td>\n              <\/tr>\n              <tr>\n                <td>6,5\u20137,0<\/td>\n                <td>Marginal<\/td>\n                <td>Augmenter la protection antioxydante<\/td>\n              <\/tr>\n              <tr>\n                <td>&gt;7,0<\/td>\n                <td>Faible<\/td>\n                <td>\u00c0 \u00e9viter \u2014 d\u00e9composition alcaline significative<\/td>\n              <\/tr>\n            <\/tbody>\n          <\/table>\n        <\/div>\n        <p class=\"protocol-note\">Utiliser une phase aqueuse tamponn\u00e9e \u2014 l'acide citrique\/citrate de sodium ou l'acide lactique\/lactate de sodium sont tous deux efficaces et cosm\u00e9tiquement appropri\u00e9s.<\/p>\n      <\/div>\n\n      <!-- Packaging -->\n      <h3>Consid\u00e9rations relatives \u00e0 l'emballage<\/h3>\n      <div class=\"packaging-list\">\n        <div class=\"packaging-item\">\n          <div class=\"packaging-icon\">\u2298<\/div>\n          <div class=\"packaging-item-text\">\n            <strong>Pompe sans air<\/strong>\n            <span>Emp\u00eache l'exposition r\u00e9p\u00e9t\u00e9e de l'oxyg\u00e8ne dans l'espace de t\u00eate \u00e0 chaque cycle d'utilisation<\/span>\n          <\/div>\n        <\/div>\n        <div class=\"packaging-item\">\n          <div class=\"packaging-icon\">\u25fc<\/div>\n          <div class=\"packaging-item-text\">\n            <strong>Contenant opaque ou bloquant les UV<\/strong>\n            <span>R\u00e9duit consid\u00e9rablement le risque de photod\u00e9gradation associ\u00e9 aux emballages transparents<\/span>\n          <\/div>\n        <\/div>\n        <div class=\"packaging-item\">\n          <div class=\"packaging-icon\">\u25ce<\/div>\n          <div class=\"packaging-item-text\">\n            <strong>Couverture d'azote pendant le remplissage<\/strong>\n            <span>R\u00e9duit l'oxyg\u00e8ne dissous au point de fabrication<\/span>\n          <\/div>\n        <\/div>\n      <\/div>\n\n      <!-- Raw material vs formulation -->\n      <h2>S\u00e9parer la couleur de la mati\u00e8re premi\u00e8re de la d\u00e9gradation de la formulation<\/h2>\n\n      <p>Une erreur de diagnostic courante : attribuer le jaunissement de la formulation \u00e0 la couleur brune de la mati\u00e8re premi\u00e8re.<\/p>\n\n      <div class=\"diagnostic-box\">\n        <div class=\"diagnostic-box-header\">Guide de diagnostic<\/div>\n        <div class=\"diagnostic-row\">\n          <div class=\"diagnostic-cell\">Couleur brune dans la mati\u00e8re premi\u00e8re (grade 40% brun-rouge\u00e2tre ou grades liquides)<\/div>\n          <div class=\"diagnostic-cell good\">\u2713 Normal \u2014 r\u00e9sidu de matrice botanique issu de l'extraction. Pas un d\u00e9faut de qualit\u00e9. V\u00e9rifier par HPLC.<\/div>\n        <\/div>\n        <div class=\"diagnostic-row\">\n          <div class=\"diagnostic-cell\">Jaunissement de la formule pendant le stockage (base blanche ou cr\u00e8me virant au jaune\/ambre)<\/div>\n          <div class=\"diagnostic-cell bad\">\u26a0 Probl\u00e8me de d\u00e9gradation oxydative \u2014 traiter l'antioxydant, la ch\u00e9lation, le pH et l'emballage.<\/div>\n        <\/div>\n      <\/div>\n\n      <p>Le jaunissement de la formule pendant le stockage est un ph\u00e9nom\u00e8ne distinct caus\u00e9 par la d\u00e9gradation oxydative de la glabridine dans le produit fini. Les deux ne sont pas li\u00e9s. D\u00e9panner la couleur de la formule en traitant l'antioxydant, la ch\u00e9lation, le pH et l'emballage \u2014 pas en passant \u00e0 une qualit\u00e9 de poudre blanche comme premi\u00e8re \u00e9tape.<\/p>\n\n      <p>Si la couleur de la formule est une pr\u00e9occupation d\u00e8s le d\u00e9part, s\u00e9lectionnez les qualit\u00e9s blanches 40%, 90% ou 98% d\u00e8s la phase de briefing \u2014 celles-ci subissent une purification suppl\u00e9mentaire pour \u00e9liminer les composants chromog\u00e8nes de la matrice botanique.<\/p>\n\n      <div class=\"callout\">\n        <p>Chaque lot est exp\u00e9di\u00e9 avec COA, TDS et SDS\/MSDS. Tests suppl\u00e9mentaires disponibles sur demande.<\/p>\n      <\/div>\n\n      <!-- Related resources -->\n      <div class=\"related-section\">\n        <h2>Ressources connexes<\/h2>\n        <div class=\"related-links\">\n          <a class=\"related-link\" href=\"https:\/\/glabridinchina.com\/fr\/glabridin\/\">\n            <span>Guide de la Glabridine pour la Formulation Cosm\u00e9tique \u2014 R\u00e9f\u00e9rence Technique Compl\u00e8te<br><small style=\"color:var(--color-text-muted);font-weight:400\">Donn\u00e9es de stabilit\u00e9 compl\u00e8tes, matrice de grades et protocoles de formulation<\/small><\/span>\n            <span class=\"related-link-arrow\">\u2192<\/span>\n          <\/a>\n          <a class=\"related-link\" href=\"\/fr\/\">\n            <span>Comment stabiliser la glabridine dans les formulations cosm\u00e9tiques<br><small style=\"color:var(--color-text-muted);font-weight:400\">Protocole de stabilisation \u00e9tape par \u00e9tape pour tous les types de syst\u00e8mes<\/small><\/span>\n            <span class=\"related-link-arrow\">\u2192<\/span>\n          <\/a>\n          <a class=\"related-link\" href=\"\/fr\/\">\n            <span>Quelle plage de pH la glabridine n\u00e9cessite-t-elle ?<br><small style=\"color:var(--color-text-muted);font-weight:400\">S\u00e9lection du tampon et gestion du pH en d\u00e9tail<\/small><\/span>\n            <span class=\"related-link-arrow\">\u2192<\/span>\n          <\/a>\n        <\/div>\n      <\/div>\n\n      <!-- CTA -->\n      <div class=\"cta-box\">\n        <div class=\"cta-box-text\">\n          <strong>Demander des \u00e9chantillons, un COA ou une consultation technique<\/strong>\n          glabridinchina.com \u00b7 jelly@huataibio.com \u00b7 +86 17868678161\n        <\/div>\n        <a class=\"cta-btn\" href=\"https:\/\/glabridinchina.com\/fr\/nous-contacter\/\">Contactez-nous \u2192<\/a>\n      <\/div>\n\n      <!-- References -->\n      <div class=\"references\">\n        <h2>R\u00e9f\u00e9rences<\/h2>\n        <ol>\n          <li>Ao M, Shi Y, Cui Y, Guo W, Wang J, Yu L. Facteurs influen\u00e7ant la stabilit\u00e9 de la glabridine. <em>Natural Product Communications<\/em>, Vol. 5(12), 1907\u20131912, 2010. DOI: 10.1177\/1934578X1000501214. PMID: 21299118.<\/li>\n          <li>Yokota T, Nishio H, Kubota Y, Mizoguchi M. L'effet inhibiteur de la glabridine extraite de la r\u00e9glisse sur la m\u00e9lanogen\u00e8se et l'inflammation. <em>Pigment Cell Research<\/em>, 11(6), 355\u2013361, 1998. DOI: 10.1111\/j.1600-0749.1998.tb00494.x.<\/li>\n          <li>ICH Q1A(R2) : Essais de stabilit\u00e9 des nouvelles substances m\u00e9dicamenteuses et des nouveaux produits m\u00e9dicamenteux. Conseil international d'harmonisation, 2003.<\/li>\n        <\/ol>\n      <\/div>\n\n      <!-- Footer note -->\n      <div class=\"article-footer\">\n        <p>Pour les formulateurs de cosm\u00e9tiques professionnels et les publics de R&amp;D. Ne constitue pas un avis r\u00e9glementaire.<br>\n        Publi\u00e9 en 2026 \u2014 Huatai Bio-Fine Chemical, Xi'an, Shaanxi, Chine.<\/p>\n      <\/div>\n\n    <\/article>\n  <\/div><!-- \/page-wrap -->\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>FAQ Stabilit\u00e9 de la formulation de la glabridine La d\u00e9coloration de la glabridine dans les \u00e9mulsions est g\u00e9n\u00e9ralement associ\u00e9e \u00e0 la d\u00e9gradation oxydative de sa structure polyph\u00e9nolique. Des traces d'ions de m\u00e9taux de transition (tels que Fe\u00b2\u207a\u2026<\/p>","protected":false},"author":8,"featured_media":5797,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[414],"tags":[],"class_list":["post-14000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-troubleshooting-faq"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.8 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why Does Glabridin Discolor in Emulsions? | Huatai Bio-Fine Chemical<\/title>\n<meta name=\"description\" content=\"Glabridin discolors in emulsions due to metal-catalyzed oxidation, UV photodegradation, and alkaline-induced oxidative degradation. 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