{"id":26,"date":"2026-10-12T14:27:58","date_gmt":"2026-10-12T14:27:58","guid":{"rendered":"https:\/\/fgvhp.com\/vhp-knowledge\/hydrogen-peroxide-uptake-isolator-filling\/"},"modified":"2026-10-13T03:42:58","modified_gmt":"2026-10-13T03:42:58","slug":"hydrogen-peroxide-uptake-isolator-filling","status":"publish","type":"post","link":"https:\/\/fgvhp.com\/ru\/vhp-knowledge\/hydrogen-peroxide-uptake-isolator-filling\/","title":{"rendered":"\u041f\u043e\u0433\u043b\u043e\u0449\u0435\u043d\u0438\u0435 \u043f\u0435\u0440\u043e\u043a\u0441\u0438\u0434\u0430 \u0432\u043e\u0434\u043e\u0440\u043e\u0434\u0430 \u043f\u0440\u0438 \u0440\u043e\u0437\u043b\u0438\u0432\u0435 \u0432 \u0438\u0437\u043e\u043b\u044f\u0442\u043e\u0440\u0435: \u0437\u0430\u0449\u0438\u0442\u0430 \u0447\u0443\u0432\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432 \u043f\u043e\u0441\u043b\u0435 VHP"},"content":{"rendered":"\n\n<section class=\"phero\"><div class=\"wrap\">\n  <div class=\"crumb\"><a href=\"\/\">Home<\/a> \/ <a href=\"\/vhp-knowledge\/\">VHP Knowledge<\/a> \/ <span>Isolators<\/span><\/div>\n  <span class=\"mono eyebrow\">Isolators<\/span>\n  <h1>Hydrogen Peroxide Uptake in Isolator Filling: Protecting Sensitive Products After VHP<\/h1>\n  <p class=\"lead\">An isolator can pass its aeration limit and still put hydrogen peroxide into the product. For oxidation-sensitive drugs, especially biologics, the question is not only &quot;is the air below 1 ppm?&quot; but &quot;how much peroxide ends up in the container?&quot; This guide explains where uptake comes from and how to control it.<\/p>\n  <div class=\"ameta\"><span>Fenggu VHP engineering team<\/span><span>4 min read<\/span><span>Updated October 2026<\/span><\/div>\n<\/div><\/section>\n\n<section class=\"fgv-sec\" style=\"padding-top:48px\"><div class=\"wrap\"><div class=\"art\">\n  <div class=\"keyp\"><b>Key points<\/b><ul><li>After aeration, low levels of H\u2082O\u2082 remain in the isolator air and continue to off-gas from gloves, gaskets and plastics.<\/li><li>Open containers and liquid product exposed to that air can pick up peroxide during filling; the amount depends on concentration, exposure time and surface area.<\/li><li>Oxidation-sensitive products \u2014 many proteins, peptides and some small molecules \u2014 may be affected at very low levels.<\/li><li>The aeration endpoint for filling should come from a product uptake study, not only from the 1 ppm occupational limit.<\/li><li>Design controls (low-absorbing materials, closed product path, good aeration capacity) usually do more than simply aerating longer.<\/li><\/ul><\/div>\n  \n  <h2>Two different limits<\/h2>\n<p>When an isolator is decontaminated with vaporized hydrogen peroxide, the cycle ends with aeration: the vapour is removed until the concentration falls below a set point. That set point is often borrowed from occupational exposure limits \u2014 1 ppm is the common figure \u2014 because it is what makes the isolator safe to open and to work at.<\/p>\n<p>For filling, the relevant question is different. The product is not breathing the air; it is sitting in open vials, syringes or bags, exposed to that air for as long as the filling run lasts. Hydrogen peroxide is highly water-soluble, so even a very low concentration in the air can transfer into an aqueous product. For a robust small molecule this rarely matters. For an oxidation-sensitive biologic, it can.<\/p>\n\n<h2>Where the residual peroxide comes from<\/h2>\n<figure>\n<svg viewBox=\"0 0 760 320\" role=\"img\" aria-label=\"Sources of residual hydrogen peroxide inside a filling isolator after aeration\" font-family=\"IBM Plex Sans, Arial, sans-serif\">\n  <rect x=\"10\" y=\"10\" width=\"740\" height=\"300\" rx=\"12\" fill=\"#F5F8FB\" stroke=\"#DCE3EC\"\/>\n  <rect x=\"40\" y=\"40\" width=\"420\" height=\"250\" rx=\"8\" fill=\"#FFFFFF\" stroke=\"#5A6B82\" stroke-width=\"2\"\/>\n  <rect x=\"60\" y=\"48\" width=\"380\" height=\"18\" rx=\"3\" fill=\"#C9D3DF\"\/>\n  <text x=\"250\" y=\"61\" font-size=\"11\" fill=\"#2B3A4F\" text-anchor=\"middle\">HEPA supply<\/text>\n  <g stroke=\"#0A8F8A\" stroke-width=\"1.2\" stroke-dasharray=\"3 4\"><line x1=\"110\" y1=\"72\" x2=\"110\" y2=\"240\"\/><line x1=\"200\" y1=\"72\" x2=\"200\" y2=\"240\"\/><line x1=\"300\" y1=\"72\" x2=\"300\" y2=\"240\"\/><line x1=\"390\" y1=\"72\" x2=\"390\" y2=\"240\"\/><\/g>\n  <circle cx=\"40\" cy=\"150\" r=\"20\" fill=\"#E6EDF4\" stroke=\"#5A6B82\" stroke-width=\"2\"\/>\n  <circle cx=\"40\" cy=\"220\" r=\"20\" fill=\"#E6EDF4\" stroke=\"#5A6B82\" stroke-width=\"2\"\/>\n  <rect x=\"80\" y=\"240\" width=\"340\" height=\"12\" fill=\"#C9D3DF\"\/>\n  <rect x=\"100\" y=\"200\" width=\"70\" height=\"40\" rx=\"4\" fill=\"#E9DFC9\" stroke=\"#B49A63\"\/>\n  <text x=\"135\" y=\"224\" font-size=\"10\" fill=\"#5B4A1F\" text-anchor=\"middle\">stoppers<\/text>\n  <g fill=\"#FFFFFF\" stroke=\"#2B3A4F\"><rect x=\"230\" y=\"210\" width=\"16\" height=\"30\"\/><rect x=\"252\" y=\"210\" width=\"16\" height=\"30\"\/><rect x=\"274\" y=\"210\" width=\"16\" height=\"30\"\/><rect x=\"296\" y=\"210\" width=\"16\" height=\"30\"\/><\/g>\n  <rect x=\"340\" y=\"150\" width=\"8\" height=\"55\" fill=\"#5A6B82\"\/>\n  <rect x=\"330\" y=\"140\" width=\"28\" height=\"12\" fill=\"#5A6B82\"\/>\n  <rect x=\"380\" y=\"195\" width=\"60\" height=\"45\" rx=\"3\" fill=\"#FFFFFF\" stroke=\"#2B3A4F\" stroke-dasharray=\"4 3\"\/>\n  <text x=\"410\" y=\"222\" font-size=\"10\" fill=\"#2B3A4F\" text-anchor=\"middle\">tub lid<\/text>\n  <g font-size=\"12\" font-weight=\"700\" fill=\"#FFFFFF\">\n    <circle cx=\"40\" cy=\"120\" r=\"11\" fill=\"#D62B2B\"\/><text x=\"40\" y=\"124\" text-anchor=\"middle\">1<\/text>\n    <circle cx=\"80\" cy=\"280\" r=\"11\" fill=\"#D62B2B\"\/><text x=\"80\" y=\"284\" text-anchor=\"middle\">2<\/text>\n    <circle cx=\"135\" cy=\"190\" r=\"11\" fill=\"#D62B2B\"\/><text x=\"135\" y=\"194\" text-anchor=\"middle\">3<\/text>\n    <circle cx=\"410\" cy=\"185\" r=\"11\" fill=\"#D62B2B\"\/><text x=\"410\" y=\"189\" text-anchor=\"middle\">4<\/text>\n    <circle cx=\"372\" cy=\"135\" r=\"11\" fill=\"#D62B2B\"\/><text x=\"372\" y=\"139\" text-anchor=\"middle\">5<\/text>\n  <\/g>\n  <g font-size=\"13\" fill=\"#0E1A2B\">\n    <text x=\"490\" y=\"60\" font-weight=\"700\">Typical sources<\/text>\n    <text x=\"490\" y=\"95\">1  Gloves and sleeves<\/text>\n    <text x=\"490\" y=\"125\">2  Gaskets, seals, plastic panels<\/text>\n    <text x=\"490\" y=\"155\">3  Stoppers and components in bowls<\/text>\n    <text x=\"490\" y=\"185\">4  Nested tubs with permeable lids<\/text>\n    <text x=\"490\" y=\"215\">5  Product path and filling needles<\/text>\n    <text x=\"490\" y=\"255\" fill=\"#5A6B82\" font-size=\"12\">All absorb vapour during gassing<\/text>\n    <text x=\"490\" y=\"273\" fill=\"#5A6B82\" font-size=\"12\">and release it during aeration<\/text>\n    <text x=\"490\" y=\"291\" fill=\"#5A6B82\" font-size=\"12\">and filling.<\/text>\n  <\/g>\n<\/svg>\n<figcaption>Schematic of a filling isolator. Numbered points are the usual places peroxide is absorbed and later released.<\/figcaption>\n<\/figure>\n<p>Aeration removes peroxide from the air quickly, but materials that absorbed it during the gassing phase keep releasing it for much longer. The concentration in the air at the start of filling, and its slow decline during filling, are governed largely by these materials:<\/p>\n<ul>\n<li><strong>Elastomers<\/strong> \u2014 gloves, sleeves, door and window gaskets, inflatable seals.<\/li>\n<li><strong>Plastics<\/strong> \u2014 panels, guards, change parts, bags and tubing.<\/li>\n<li><strong>Components loaded before the cycle<\/strong> \u2014 stoppers, caps and especially nested tubs. Lids made of spunbonded polyolefin are permeable to the vapour, so the inside of the tub, and the containers in it, may be exposed.<\/li>\n<li><strong>Product-contact parts<\/strong> \u2014 if the filling needles, tubing or pumps are open to the isolator during the cycle, peroxide can be adsorbed on surfaces that later contact the product directly.<\/li>\n<\/ul>\n\n<h2>Which products are at risk<\/h2>\n<p>Hydrogen peroxide is an oxidant. Proteins are the classic sensitive case: residues such as methionine and tryptophan can be oxidised, which may affect potency, aggregation or immunogenicity. Published studies on monoclonal antibodies and other biologics have shown measurable oxidation after exposure to peroxide at very low concentrations in solution, and some small-molecule APIs and excipients (for example polysorbates) are also sensitive. Whether a given product is affected has to be established for that product; there is no universal safe level.<\/p>\n\n<h2>How to measure uptake<\/h2>\n<p>An uptake study answers the question directly: how much peroxide does the product, or a surrogate, pick up under worst-case conditions?<\/p>\n<table>\n<thead><tr><th>Element<\/th><th>Typical approach<\/th><\/tr><\/thead>\n<tbody>\n<tr><th>Surrogate<\/th><td>Water for injection or placebo buffer in the real container, filled at the start of the run when residual levels are highest<\/td><\/tr>\n<tr><th>Positions<\/th><td>Open containers at worst-case locations: near gloves, near absorbent materials, at the start of the conveyor, low-airflow spots<\/td><\/tr>\n<tr><th>Exposure<\/th><td>The longest realistic open time, including line stoppages<\/td><\/tr>\n<tr><th>Assay<\/th><td>A method sensitive enough for the expected range \u2014 usually a fluorometric or other low-level peroxide assay, validated for the matrix<\/td><\/tr>\n<tr><th>Air data<\/th><td>Low-range H\u2082O\u2082 sensor readings in the isolator during the study, so air concentration can be related to product uptake<\/td><\/tr>\n<tr><th>Product impact<\/th><td>For sensitive products, a spiking study showing which concentration in solution starts to affect quality attributes<\/td><\/tr>\n<\/tbody>\n<\/table>\n<p>Combining the two results gives a defensible link: the air concentration at which filling may start, and the margin between expected uptake and the level that affects the product.<\/p>\n\n<h2>Controls that work<\/h2>\n<table>\n<thead><tr><th>Lever<\/th><th>What to do<\/th><\/tr><\/thead>\n<tbody>\n<tr><th>Aeration endpoint<\/th><td>Set the filling start condition from the uptake study. For sensitive products this is often well below 1 ppm, which needs a low-range sensor to verify.<\/td><\/tr>\n<tr><th>Aeration capacity<\/th><td>Sufficient air changes and a catalytic converter in the recirculation or exhaust path shorten aeration; warmer air helps materials release peroxide faster.<\/td><\/tr>\n<tr><th>Materials<\/th><td>Prefer low-absorbing materials inside the isolator (316L, glass, PTFE, PVDF); minimise exposed elastomer and soft plastic area. See <a href=\"\/vhp-knowledge\/vhp-material-compatibility\/\">VHP material compatibility<\/a>.<\/td><\/tr>\n<tr><th>Closed product path<\/th><td>Keep pre-sterilised product-contact parts closed or protected during the cycle so they are not exposed to vapour.<\/td><\/tr>\n<tr><th>Component loading<\/th><td>Decide what is in the isolator during gassing. Components introduced afterwards through a decontaminated transfer route are not loaded with peroxide.<\/td><\/tr>\n<tr><th>Cycle dose<\/th><td>Avoid overdosing. A cycle developed to deliver the required lethality with margin, rather than the maximum, leaves less to aerate.<\/td><\/tr>\n<tr><th>Fill sequence<\/th><td>Where justified by data, discard or segregate the first containers filled, when residuals are highest.<\/td><\/tr>\n<\/tbody>\n<\/table>\n<p>Most of these are design decisions. They are far easier to make in the URS than after the isolator is built, which is why product sensitivity to peroxide should be one of the first questions asked when a filling isolator is specified.<\/p>\n<p>For the overall approach to isolator selection see <a href=\"https:\/\/fenggu-bio.com\/how-to-choose-a-pharmaceutical-isolator\/\" target=\"_blank\" rel=\"noopener\">how to choose a pharmaceutical isolator<\/a>; for cycle development and qualification see <a href=\"https:\/\/fenggu-bio.com\/vhp-cycle-development-qualification\/\" target=\"_blank\" rel=\"noopener\">VHP cycle development and IQ\/OQ\/PQ<\/a> on our main site.<\/p>\n  \n  <div class=\"refs\"><p><b>References<\/b><\/p><p>EU GMP Annex 1 (2022), Manufacture of Sterile Medicinal Products<\/p><p>PDA Technical Report No. 34, Design and Validation of Isolator Systems for the Manufacturing and Testing of Health Care Products<\/p><p>ISO 13408-6, Aseptic processing of health care products \u2014 Isolator systems<\/p><p>ISO 22441:2022 \u2014 Low temperature vaporized hydrogen peroxide sterilization<\/p><\/div>\n<\/div><\/div><\/section>\n\n<section class=\"fgv-sec alt\"><div class=\"wrap\">\n  <span class=\"mono eyebrow\">Equipment<\/span><h2>Fenggu equipment for this<\/h2>\n  <div class=\"opts\"><a class=\"opt\" href=\"https:\/\/fenggu-bio.com\/products\/aseptic-filling-isolator\/\" target=\"_blank\" rel=\"noopener\"><span class=\"mono\">FG-ISO-AF<\/span><h3>Aseptic filling isolator<\/h3><p>Integrated VHP bio-decontaminates exposed interior surfaces before every campaign; unidirectional airflow, H14 HEPA, pressure and particle monitoring.<\/p><span class=\"go\">View specifications \u2192<\/span><\/a><a class=\"opt\" href=\"https:\/\/fenggu-bio.com\/products\/cell-processing-isolator\/\" target=\"_blank\" rel=\"noopener\"><span class=\"mono\">FG-ISO-CC<\/span><h3>Cell processing isolator<\/h3><p>For open handling of cells and biologics, where peroxide sensitivity is often a key requirement.<\/p><span class=\"go\">View specifications \u2192<\/span><\/a><a class=\"opt\" href=\"https:\/\/fenggu-bio.com\/products\/vhp-pass-box\/\" target=\"_blank\" rel=\"noopener\"><span class=\"mono\">FG-PB-VHP<\/span><h3>VHP pass box<\/h3><p>Transfers components into the isolator after the main cycle, so they are not loaded with peroxide during gassing.<\/p><span class=\"go\">View specifications \u2192<\/span><\/a><\/div>\n  <p style=\"margin-top:24px\">Related application guides: <a class=\"go\" href=\"\/applications\/isolator-rabs-decontamination\/\">Isolator and RABS decontamination<\/a> \u00b7 <a class=\"go\" href=\"\/applications\/cell-gene-therapy\/\">Cell and gene therapy<\/a><\/p>\n<\/div><\/section>\n\n<section class=\"fgv-sec\"><div class=\"wrap narrow\">\n  <span class=\"mono eyebrow\">FAQ<\/span><h2>Common questions<\/h2>\n  <div class=\"faq\"><details><summary>Is 1 ppm H\u2082O\u2082 low enough to start aseptic filling?<\/summary><p>1 ppm is an occupational exposure limit, not a product limit. For robust products it may be acceptable, but for oxidation-sensitive products the start condition should come from an uptake study and is often well below 1 ppm.<\/p><\/details><details><summary>Why does residual H\u2082O\u2082 remain after aeration?<\/summary><p>Gloves, gaskets, plastics and loaded components absorb peroxide during the gassing phase and release it slowly. Air concentration falls quickly, but off-gassing from these materials keeps a low level present for much longer.<\/p><\/details><details><summary>Which products are sensitive to hydrogen peroxide?<\/summary><p>Proteins such as monoclonal antibodies, peptides, and some small molecules and excipients can be oxidised. Sensitivity has to be established for each product, usually with a spiking study.<\/p><\/details><details><summary>How is hydrogen peroxide uptake into product measured?<\/summary><p>Containers filled with water or placebo are exposed at worst-case positions and for the longest realistic time, then analysed with a sensitive, validated peroxide assay. Air concentration is logged at the same time with a low-range sensor.<\/p><\/details><details><summary>How can H\u2082O\u2082 uptake be reduced?<\/summary><p>By using low-absorbing materials, keeping the product path closed during the cycle, introducing components after the cycle, avoiding overdosing, providing good aeration capacity and setting the filling start condition from data.<\/p><\/details><\/div>\n<\/div><\/section>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is 1 ppm H\u2082O\u2082 low enough to start aseptic filling?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"1 ppm is an occupational exposure limit, not a product limit. 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