{"id":10123,"date":"2026-09-18T07:58:42","date_gmt":"2026-09-18T07:58:42","guid":{"rendered":"https:\/\/changhongchemical.com\/?p=10123"},"modified":"2026-09-18T07:58:42","modified_gmt":"2026-09-18T07:58:42","slug":"a-practical-guide-to-botanical-ingredient-testing","status":"publish","type":"post","link":"https:\/\/changhongchemical.com\/fr\/a-practical-guide-to-botanical-ingredient-testing\/","title":{"rendered":"When Your Lab Results Don\u2019t Match the Supplier\u2019s COA: A Practical Guide to Botanical Ingredient Testing"},"content":{"rendered":"<h1><strong>When Your Lab Results Don\u2019t Match the Supplier\u2019s COA: A Practical Guide to Botanical Ingredient Testing<\/strong><\/h1>\n<p>A botanical ingredient arrives with a certificate of analysis reporting 98.0% assay. Your laboratory tests the shipment and reports 95.1%.<\/p>\n<p>Should you reject the material, request a replacement, or repeat the analysis?<\/p>\n<p>First, establish whether the two laboratories measured the same characteristic on the same reporting basis. Differences in sample preparation, reference standards, filtration, and calculations can produce results that appear contradictory.<\/p>\n<p>This guide explains what to check before drawing a conclusion\u2014and how laboratory equipment, glassware, and consumables affect the investigation.<\/p>\n<p><em>Editorial disclosure: Changhong Chemical and Longchang Chemical are affiliated businesses within the same corporate group.<\/em><\/p>\n<h2>1. Check What the Reported Percentage Means<\/h2>\n<p>Before comparing numbers, compare their definitions.<\/p>\n<p>An entry such as \u201c98% by HPLC\u201d leaves several questions unanswered:<\/p>\n<ul>\n<li>Does it represent chromatographic area percentage or a quantitative assay?<\/li>\n<li>Is the result reported on an as-received, dried, or anhydrous basis?<\/li>\n<li>Does it describe one identified compound or a group of compounds?<\/li>\n<li>Is it a specification limit or the measured result for that batch?<\/li>\n<\/ul>\n<p>A product specification describes the acceptance requirements. A batch COA records the results or conformity statements for a particular lot. These documents serve different purposes.<\/p>\n<h3>A hypothetical example: 98.0% and 95.1% may be compatible<\/h3>\n<p>Assume a material has:<\/p>\n<div>\n<div>\n<div>\n<table>\n<thead>\n<tr>\n<th>Param\u00e8tres<\/th>\n<th>Hypothetical value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Assay reported on an anhydrous basis<\/td>\n<td>98.0%<\/td>\n<\/tr>\n<tr>\n<td>Water content of the received sample<\/td>\n<td>3.0%<\/td>\n<\/tr>\n<tr>\n<td>Corresponding assay on an as-received basis<\/td>\n<td>95.06%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<p>If the method requires only a water correction, the relationship is:<\/p>\n<p><strong>As-received assay = Anhydrous assay \u00d7 (1 \u2212 Water fraction)<\/strong><\/p>\n<p><strong>98.0% \u00d7 0.970 = 95.06%<\/strong><\/p>\n<p>In this simplified example, a result of approximately 95.1% does not necessarily contradict 98.0%. The reporting basis explains the apparent difference.<\/p>\n<p>This calculation is illustrative, not a result for any commercial product. It should not be applied to chromatographic area percentages or to methods requiring different corrections.<\/p>\n<p>Also, do not automatically substitute loss on drying for water content. Loss on drying can include other volatile substances, whereas Karl Fischer analysis specifically determines water when appropriately applied to the sample. Sartorius explains the distinction.<\/p>\n<h2>2. Confirm the Sample Before Troubleshooting the Instrument<\/h2>\n<p>Start with traceability.<\/p>\n<p>Check that the supplier\u2019s COA, the container label, and your laboratory record identify the same lot and grade. Then review how the test sample was obtained and handled.<\/p>\n<p>Questions worth asking include:<\/p>\n<ul>\n<li>Was the sample collected according to an appropriate sampling plan?<\/li>\n<li>Was any required mixing performed before subsampling?<\/li>\n<li>Was the container exposed to moisture or unsuitable storage conditions?<\/li>\n<li>Were the supplier\u2019s and receiving laboratory\u2019s samples taken at different times?<\/li>\n<li>Is a retained sample available for investigation?<\/li>\n<\/ul>\n<p>Repeatedly testing one small portion cannot establish whether that portion represents the shipment.<\/p>\n<p>Record the sampling and storage history before opening another container or preparing additional solutions. This information helps distinguish a sampling issue from an analytical difference.<\/p>\n<h2>3. Review Weighing and Dilution Together<\/h2>\n<p>The concentration reaching the instrument depends on every preparation step.<\/p>\n<h3>Balance readability is not minimum sample weight<\/h3>\n<p>A balance displaying 0.1 mg does not automatically provide acceptable accuracy for every small sample mass. Its minimum usable weight depends on performance under actual operating conditions and the uncertainty acceptable for the measurement. METTLER TOLEDO describes these factors.<\/p>\n<p>Check whether both the sample and reference standard were weighed within the balance\u2019s qualified working range.<\/p>\n<p>Also review:<\/p>\n<ul>\n<li>Static electricity, drafts, and unstable readings.<\/li>\n<li>Moisture uptake during weighing.<\/li>\n<li>Material remaining on weighing vessels or transfer tools.<\/li>\n<li>Transcription errors in recorded masses.<\/li>\n<\/ul>\n<h3>Treat glassware as part of the measurement<\/h3>\n<p>For quantitative preparation, use volumetric equipment appropriate to the method and required accuracy.<\/p>\n<p>Confirm the flask volume, pipette setting, dilution sequence, and units. Check that all required transfers were quantitative and that solutions were mixed adequately.<\/p>\n<p>Reconstruct the full dilution calculation from the original records. A missed intermediate dilution or incorrect volume entry can create a consistent discrepancy even when the chromatograms look normal.<\/p>\n<h2>4. Investigate Extraction and Filtration<\/h2>\n<p>A clear solution does not, by itself, prove that sample preparation was suitable.<\/p>\n<p>For botanical materials, review whether the specified preparation recovers the target constituent adequately from the sample matrix. Relevant variables may include solvent composition, extraction time, temperature, and the ratio of sample mass to solvent volume.<\/p>\n<p>Changing these conditions without establishing their effect can make results difficult to compare.<\/p>\n<h3>A syringe filter can change more than particle content<\/h3>\n<p>Filter selection requires attention to solvent compatibility, analyte recovery, and substances released from the filter. Pore size alone is insufficient. Agilent discusses filtration recovery and chemical cleanliness.<\/p>\n<p>During method development or an approved investigation, useful comparisons may include:<\/p>\n<div>\n<div>\n<div>\n<table>\n<thead>\n<tr>\n<th>Check<\/th>\n<th>Question it helps answer<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Filtered solvent blank<\/td>\n<td>Does the filter introduce interfering signals?<\/td>\n<\/tr>\n<tr>\n<td>Suitable alternative membrane materials<\/td>\n<td>Does analyte recovery depend on the membrane?<\/td>\n<\/tr>\n<tr>\n<td>Successive filtrate portions<\/td>\n<td>Does recovery change as more solution passes through?<\/td>\n<\/tr>\n<tr>\n<td>An established, suitable reference preparation<\/td>\n<td>Does filtration introduce measurable bias?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<p>Define acceptance criteria according to the method\u2019s intended performance. Do not assume that a membrane suitable for one ingredient will perform equally well for another.<\/p>\n<p>Any comparison preparation must remain compatible with the analytical system; particle-containing samples should not be injected simply to obtain an \u201cunfiltered\u201d result.<\/p>\n<h2>5. Distinguish HPLC Area Percentage from Quantitative Assay<\/h2>\n<p>A large main peak is useful information, but it does not establish every aspect of material quality.<\/p>\n<p>Chromatographic area percentage expresses the proportion of integrated detector response assigned to a peak under specified conditions. Quantitative assay uses a defined calibration and calculation procedure to estimate the amount of an analyte.<\/p>\n<p>These results are not automatically interchangeable.<\/p>\n<p>Detector response varies between compounds, and the method must adequately separate the analyte from relevant interference. Agilent describes area-based purity estimation, while Merck\u2019s method-development guidance explains the importance of specificity and other validation characteristics. <a href=\"https:\/\/www.agilent.com\/cs\/library\/applications\/5991-9085EN_OpenLab_CDS_Sample_Purity_part1_appnote.pdf\">Agilent purity estimation<\/a>, <a href=\"https:\/\/www.sigmaaldrich.com\/deepweb\/assets\/sigmaaldrich\/marketing\/global\/documents\/446\/037\/hplc-method-dev-guide-br6818en-ms.pdf\">Merck HPLC method development<\/a>.<\/p>\n<p>For a result comparison, request enough information to understand:<\/p>\n<ul>\n<li>The measurement and calibration approach.<\/li>\n<li>Reference standard identity and assigned value.<\/li>\n<li>Relevant chromatographic conditions.<\/li>\n<li>Integration and calculation rules.<\/li>\n<li>System suitability results.<\/li>\n<li>Reporting basis and correction factors.<\/li>\n<\/ul>\n<p>A chromatogram without its method and calculation context may not resolve the disagreement.<\/p>\n<p>Also distinguish repeated injections from independent preparations. Repeated injections of one vial mainly examine injection and instrumental repeatability. Separately weighing and preparing samples helps evaluate variability introduced earlier in the procedure.<\/p>\n<h2>6. Check the Reference Standard and Solution History<\/h2>\n<p>Two laboratories can use similar equipment yet obtain different results if their standards or solutions differ.<\/p>\n<p>Review the reference standard\u2019s documentation, assigned value, storage conditions, and applicable validity period. Confirm that any required correction was applied consistently and was not counted twice.<\/p>\n<p>Then examine the prepared solutions:<\/p>\n<ul>\n<li>Were they analysed within an established period of stability?<\/li>\n<li>Were storage conditions appropriate?<\/li>\n<li>Was evaporation possible?<\/li>\n<li>Were visible precipitation or other changes recorded?<\/li>\n<li>Were the standard and sample handled consistently with the method?<\/li>\n<\/ul>\n<p>These questions help identify whether the comparison involves equivalent solutions, rather than merely equivalent instrument settings.<\/p>\n<h2>7. Request a Useful Documentation Package<\/h2>\n<p>An efficient supplier discussion starts with a precise request.<\/p>\n<p>For botanical ingredients, ask for the current specification and COA for the relevant lot, together with sufficient method information to interpret the reported result. Buyers exploring materials through <a href=\"https:\/\/longchangextracts.com\/\">Longchang extracts\u00a0<\/a> can use the following checklist when requesting documentation and samples.<\/p>\n<div>\n<div>\n<div>\n<table>\n<thead>\n<tr>\n<th>Information to request<\/th>\n<th>Why it matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Product identity, grade, and lot number<\/td>\n<td>Connects the documents to the material being evaluated<\/td>\n<\/tr>\n<tr>\n<td>Current specification<\/td>\n<td>Identifies the agreed acceptance requirements<\/td>\n<\/tr>\n<tr>\n<td>Lot-specific COA<\/td>\n<td>Distinguishes batch results from advertised grades<\/td>\n<\/tr>\n<tr>\n<td>Assay definition, units, and reporting basis<\/td>\n<td>Establishes whether results are comparable<\/td>\n<\/tr>\n<tr>\n<td>Method reference and revision<\/td>\n<td>Identifies the analytical procedure<\/td>\n<\/tr>\n<tr>\n<td>Relevant sample preparation and calculation details<\/td>\n<td>Supports investigation of differences<\/td>\n<\/tr>\n<tr>\n<td>Reference standard information<\/td>\n<td>Clarifies the quantitative basis<\/td>\n<\/tr>\n<tr>\n<td>Supporting chromatograms, where available<\/td>\n<td>Helps assess separation and integration<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<p>A concise request might read:<\/p>\n<blockquote><p>Please provide the current specification and COA for the proposed lot, including the assay method reference, reporting basis, and reference standard information. To support comparison with our incoming inspection, please also provide relevant sample preparation, calculation, and chromatographic information where available.<\/p><\/blockquote>\n<p>Not every supplier can disclose a complete proprietary method. The immediate objective is to obtain enough information for a meaningful technical comparison.<\/p>\n<h2>8. Investigate Differences Without Testing Until Something Passes<\/h2>\n<p>If the discrepancy remains, agree on a documented investigation.<\/p>\n<p>Preserve the original results and records. Check calculations and preparation history, then select further work based on a specific hypothesis\u2014for example, a reporting-basis difference, filter-related loss, or incomplete extraction.<\/p>\n<p>Possible next steps include independent preparations, testing an appropriately retained sample, or arranging comparison testing with an agreed method. Additional testing should follow the laboratory\u2019s quality procedures; a favourable repeat result does not automatically invalidate the original result.<\/p>\n<p>Keep the investigation proportionate to the decision. Confirming an assay discrepancy does not resolve separate questions about identity, contaminants, or suitability for the intended application.<\/p>\n<p>The most useful outcome is a documented explanation of the difference, supported by evidence, and a clear basis for accepting, rejecting, or further evaluating the material.<\/p>","protected":false},"excerpt":{"rendered":"<p>When Your Lab Results Don\u2019t Match the Supplier\u2019s COA: A Practical Guide to Botanical Ingredient Testing A botanical ingredient arrives with a certificate of analysis reporting 98.0% assay. Your laboratory tests the shipment and reports 95.1%. Should you reject the material, request a replacement, or repeat the analysis? First, establish whether the two laboratories measured [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10123","post","type-post","status-publish","format-standard","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>When Your Lab Results Don\u2019t Match the Supplier\u2019s COA: A Practical Guide to Botanical Ingredient Testing - Changhong Chemical<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/changhongchemical.com\/fr\/a-practical-guide-to-botanical-ingredient-testing\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"When Your Lab Results Don\u2019t Match the Supplier\u2019s COA: A Practical Guide to Botanical Ingredient Testing - Changhong Chemical\" \/>\n<meta property=\"og:description\" content=\"When Your Lab Results Don\u2019t Match the Supplier\u2019s COA: A Practical Guide to Botanical Ingredient Testing A botanical ingredient arrives with a certificate of analysis reporting 98.0% assay. 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