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Wrapping your head around reagent and chemical grade terminology in our industry can be time-consuming and at times frustrating – especially globally. At Captivate Bio, we’ve learned over time from customers that each country may have their own guidance and terminology may slightly differ from another country, causing further confusion in our industry. Terms like GMP-grade, RUO-grade, Cell Culture Grade, and Food Grade are some of the most overlooked – but most impactful – terms in life science research.
Selecting the correct reagent or chemical grade is critical for achieving reliable and reproducible results in your experiments. Reagent and chemical grades indicate certain quality specifications including identifying the purity, testing standards, and intended use of a product. Using the wrong grade can create major issues for your project by introducing contaminants, variability, or regulatory issues.
This guide will go over some of the most common terminology as we’ve learned over the years and how they might impact your studies.
The primary organizations that establish standards, specifications, and grades for reagents and chemicals are the American Chemical Society (ACS) and the United States Pharmacopeia (USP), alongside other industrial and international bodies.These are a few of the organizations that publish guidelines that define purity levels, maximum impurity limits, and testing methods, which manufacturers must follow to label their products with specific grades. These organizations include:
Cells are highly sensitive to contaminants such as mycoplasma, endotoxins, enzymes, and trace impurities. Even small variations in reagent quality can influence cell viability, differentiation, gene expression, and reproducibility.
Below is a short list of grades, terms, and top tips on how they impact on cell culture.
Cell culture grade reagents are specifically formulated to the highest purity standards for cultivating cells. These materials undergo extensive quality testing to ensure they are sterile and free from impurities, mycoplasma, endotoxin, and non-toxic. Cell culture grade reagents often meet USP/ACS standards and are often animal-free. Example cell culture products include Water, Balanced Salt Solutions (DPBS, PBS), DMSO, and other reagents and chemicals.
Expanded quality specifications are reported on the products Certificate of Analysis (COA) include: pH, sterility, endotoxin, mycoplasma, and assay results. Cell culture grade reagents are widely used in mammalian cell culture, stem cell research, and cell therapy development.
Research Use Only (RUO) products are lab tools, reagents, or devices intended exclusively for general research, scientific investigation, or development, and are not to be used for clinical diagnostic or therapeutic use. They are exempt from strict FDA or CE-IVD regulatory approvals, allowing faster innovation but prohibiting use in human diagnostics. This is the most commonly used grade used in research today. Research use only reagents and chemicals can also be manufactured following current Good Manufacturing Practices (GMP) but are not classified as such due to varying factors including an established set of quality specifications compared to cGMP quality in order to keep costs down.
While RUO materials may have similar chemical compositions to diagnostic products or GMP-grade material, they lack the documentation that quality management systems require to ensure safety in human use. Most early-stage research reagents used in cell culture, molecular biology, and drug discovery are classified as RUO. Not all RUO products are the same and using the term research-grade is another use in the market to describe RUO products.
ACS grade chemicals meet purity standards established by the American Chemical Society (ACS). These reagents are considered highly pure and suitable for analytical laboratory applications. This grade is for high-precision analysis, research, reagent prep, and laboratory work and can be used for ACS applications or for general procedures that require stringent quality specifications and a purity of ≥95%.
While ACS-grade chemicals have high purity however, they are not always tested specifically for cell culture compatibility, so additional you may need to do additional testing and validation to confirm.
USP grade reagents meet or exceed the high-purity standards defined by the United States Pharmacopeia (USP), ensuring safety for human consumption, medicinal use, and pharmaceutical manufacturing. These chemicals are typically 99% pure, with strict requirements for identity, strength, quality, and purity.
USP-grade chemicals are often used in, pharmaceutical manufacturing, biopharmaceutical process development, and downstream research applications. Because of their regulatory acceptance, USP-grade materials may be selected for translational research or therapeutic development workflows.
From time-to-time, you may find that some reagents have been manufactured under cGMP guidelines using USP grade materials but are still labeled RUO.
GMP (Good Manufacturing Practice) grade reagents are manufactured under strict regulatory guidelines designed enforced by agencies like the FDA for pharmaceutical and clinical production environments. These reagents are comply with 21 CFR parts 210, 211, 820, and 11. GMP-grade reagents ensure quality, consistency, safety and feature rigorous documentation, validated methods, and strict contamination controls and tend to be more expensive due to the investment in manufacturing practices and regulatory oversight.
Typical GMP attributes include:
GMP-grade reagents may be suitable for manufacturing active pharmaceutical ingredients for clinical trials. These reagents are commonly used in cell therapy manufacturing, clinical research, and advanced biomanufacturing but may not fully address the specialized requirements of ancillary materials used in cell and gene therapy.
Understanding reagent and chemical grade terminology can help you make informed decisions about the materials you choose to use in your research projects. By selecting reagents that match the purity, testing, and regulatory needs of your workflow, you can improve reproducibility and maintain high-quality cell culture systems while minimizing costs and maximizing budgets.
Captivate Bio offers several grades of reagents and chemicals with standard or expanded quality testing. Contact our team today with questions or to inquire about certain grades of products for your next project.
Please note we will be continuing to add and update this article on an ongoing basis.
Learn more about how we support researchers with cell culture products, contract manufacturing and storage services, custom reagent sourcing, as well as marketing, sales, and distribution programs for our industry partners.
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