What reagent grades, purity labels and specifications mean: ACS/AR, HPLC, electronic grade and tag-grade proteins, in 190+ guides from Aladdin Scientific.
“HPLC (High-Performance Liquid Chromatography) grade” generally refers to solvents (and related reagents) that are specifically optimized and qualified against chromatographic criteria. The core objective is to avoid introducing impurities that affect the detector baseline or separations ...
“Photographic grade” identifies reagents whose impurity profile and consistency are suitable for silver-halide photographic processing and emulsion making. The grade is anchored in international/industry test methods and product specifications that focus on trace contaminants known to cause ...
High-Performance Liquid Chromatography (HPLC) separates compounds in a liquid stream by how strongly they interact with a packed column, and derivatization is the deliberate chemical conversion of an analyte into a closely related “derivative” that’s easier to analyze—typically to add a ...
Ordinary solvents and matrices often contain trace water, carbonyls, alcohols, or aromatics that show bands in the mid-IR and mask your analyte. “IR spectroscopy grade” (often labeled for IR spectroscopy, spectroscopic grade (IR)) refers to reagents—primarily solvents, sample matrices, and ...
Gas chromatography (GC) separates volatile or semi-volatile compounds as a sample is carried by an inert gas through a coated column; compounds elute at different times based on interactions with the stationary phase. It’s fast, robust, and ideal for analytes that can be vaporized without ...
“Standard for GC” (often shown as for GC, GC grade, or analytical standard, for GC) is a supplier-defined quality grade for neat chemicals or ready-to-use solutions that are intended for gas chromatography workflows. The grade ensures very low background on common GC detectors (FID, ECD, ...
Recrystallization is a purification process for solid chemicals: dissolve the impure solid in a hot solvent (or solvent mix), remove insoluble matter, then let it cool so pure crystals form while soluble impurities stay in solution. The solid is collected and dried. In lab practice, it’s one ...
“UHPLC grade” (Ultra-High-Performance Liquid Chromatography grade) describes solvents and mobile-phase additives that are qualified specifically for UHPLC systems operating at very high pressures with sub-2 µm (or superficially porous, SPP) columns. Compared with regular HPLC grade, UHPLC ...
“for TLC” indicates a reagent or material is suitable for thin-layer chromatography (TLC)—the planar chromatography technique used for quick separations, purity checks, identity confirmation, and reaction monitoring. In practice, “for TLC” appears on stationary phases and sorbents ...
LC–MS/MS–based proteomics has expanded from discovery research to quantitation, multi-site PTM profiling, targeted verification, and large-cohort studies. Compared with routine protein experiments, proteomics is more sensitive to chemical background, ion suppression, sample loss, and batch ...
Flow cytometry analyzes cells at the single-cell level and, with multi-laser/multi-channel fluorescence detection, can rapidly measure high-dimensional cell phenotypes, functions, and microenvironments.
In cell culture, single-use compounding systems, IVD components, and sterile tooling, terminal sterilization is often used as one of the risk-control measures.
These solvents/reagents are manufactured and QC-tested specifically for ultra-high-performance LC (sub-2 µm particles, high pressure) with mass-spectrometry detection. They have very low non-volatile residue, ppb-level metals, minimal UV/MS background, and sub-micron particulates so columns and ...
SDS-PAGE endows proteins with approximately uniform charge density under denaturing conditions via sodium dodecyl sulfate and separates them by apparent molecular weight through the gel’s sieving effect. It is a foundational technique for protein identification, purity assessment, and quality ...
Basic-Grade Reagents, also known as Laboratory Grade, Practical Grade, or Chemically Pure (CP), are chemicals that meet a manufacturer’s internal specifications for purity. They are intended for applications where high precision and the absence of trace impurities are not critical to the ...
Immunohistochemistry (IHC) integrates tissue morphology with immunology to visualize target molecule expression on tissue sections via antigen–antibody specific recognition. It is widely used in basic research, drug development, pathological validation, and digital pathology analysis. IHC is ...
“For atomic absorption spectroscopy” (often shown as AAS grade) identifies reagents and standards formulated so their trace metal background is extremely low and lot-to-lot composition is tightly controlled—so blanks stay quiet and calibration stays linear at ppb–ppt levels.
Pathology links basic biology with clinical medicine and is a core technical platform for diagnosis, drug development, and studies of tissue function. From tissue sectioning and H&E staining to IHC, ISH/FISH, and digital pathology, the purity, stability, and formulation optimization of reagents ...
Chemiluminescence (CL) is a highly sensitive detection technique in which chemical reaction energy is converted into light, and it is widely used in immunoassays, nucleic-acid tests, enzyme-activity measurements, and clinical diagnostics.
“For amino acid analysis” (often abbreviated AAA) is an application-specific grade used by reagent manufacturers to indicate the product is suitable for quantitative amino acid workflows—classically protein hydrolysis followed by separation/detection on an amino acid analyzer or ...
“For Preparation” denotes a supplier-defined quality tier intended for routine preparative chemistry (organic or inorganic) where ultra-trace impurity control is not critical to the outcome. There’s no single external standard for “for preparation”—manufacturers set the specs and QC ...
Enzyme-linked immunosorbent assay (ELISA) is a highly sensitive quantitative detection method based on the specific reaction between antigen and antibody, and is widely used in immunology, molecular biology, drug development, and clinical diagnosis. Because the detection signal of this technique ...
Nucleic acid electrophoresis is one of the most commonly used separation and detection methods in molecular biology experiments.
“Electrochemical grade” refers to reagents—most commonly solvents and supporting electrolytes—manufactured and qualified to minimize electroactive impurities (moisture, protic/oxidizable/reducible species, trace metals, halides, peroxides) that distort electrochemical measurements or ...
Hydrophilicity / hydrophilic: tendency to be solvated by water and interact with polar groups/solvents.
FCC grade indicates a material meets the compendial specifications in the Food Chemicals Codex (FCC)—a collection of internationally recognized standards for the identity, purity, and quality of food ingredients. The FCC is maintained and published by the U.S. Pharmacopeia (USP). In August ...
Nucleic acid hybridization technology is an important molecular tool for studying gene structure, expression, and distribution, in which Northern blotting is used for RNA analysis and Southern blotting is used for DNA detection. The core of these two methods lies in the integrity of nucleic ...
Hydrogen-storage grade A vendor-defined quality label for materials used to store, absorb/release, or generate H₂—for example metal hydrides (e.g. TiH₂), complex/chemical carriers (e.g., NaBH₄, ammonia borane), and hydrogen-storage alloys (e.g. Mischmetal–Ni).
Protein analysis is a fundamental step in studying protein structure, function, and interactions, and holds a central position in life sciences, drug development, and clinical diagnostics. Due to the complexity of proteins and their sensitivity to environmental conditions, experimental results ...
“For GC derivatization” is a supplier-designated quality label for reagents that are tested and packaged specifically for chemical derivatization prior to gas chromatography (GC/GC-MS)—with emphasis on very low moisture/reactive impurities and proven performance for forming volatile, ...
Insect cell systems (such as Sf9, Sf21, High Five, etc.) are important platforms for protein expression, viral vector preparation, and vaccine development. “Reagents suitable for insect cell culture” (For Insect Cell Culture Reagents) are products specifically designed and validated to meet ...
In molecular biology and cell biology research, RNA is the biomacromolecule most prone to degradation. RNases widely present in the environment and samples have strong activity; even extremely low levels of contamination can rapidly destroy RNA during extraction, quantification, reverse ...
Puriss. p.a. is a supplier-used grade label commonly found on analytical reagents.
“For fluorescence analysis” (often written “for fluorescence spectroscopy”) designates reagents—most commonly solvents—manufactured and QC-tested to have very low self-fluorescence and very low UV absorbance so they don’t add background or distort emission/excitation spectra. In ...
In molecular biology, cell biology, and protein research, protease contamination is a common hidden risk leading to experimental failure. Even trace protease residues can cause degradation of nucleic acid or protein samples, affect cell status, and even interfere with downstream diagnostics and ...
In cell biology, pharmacology, and translational research, cell-culture reagents are the foundation for maintaining stability and physiological relevance of in-vitro models. This class spans media, supplements, buffers, and auxiliaries, directly affecting cellular proliferation, differentiation, ...
“GMO-free” (often marketed as Non-GMO) indicates a product is not derived from genetically modified organisms (GMOs) and controls are in place to avoid adventitious/technical contamination.
“Cosmetic grade” isn’t a single global purity label. It means a raw material is suitable for use in cosmetics because it complies with cosmetic regulations in the market where the finished product will be sold and is controlled under cosmetics GMP.
E 508 is the EU “E-number” for potassium chloride (KCl) when it’s used as a food additive. E-numbers are assigned within the European Union after safety assessment by EFSA; detailed identity and purity specifications for each approved additive are laid down in Commission Regulation (EU) No ...
Sublimation is the direct transition of a solid to vapor and back to solid without a liquid phase; it’s used to purify volatile solids by letting the target compound vaporize and re-deposit on a cold surface, leaving most non-volatile impurities behind.
CP (Chemical Pure) is the workhorse grade for routine synthesis, teaching labs, and everyday process steps—built for dependable performance at sensible cost. It is not a globally harmonized designation: the label “CP” does not equal an ACS grade. In Mainland China and some adjacent ...
In vitro diagnostics (IVD) bridge fundamental research and clinical medicine and demand exceptionally high standards for reagent purity, stability, and compliance. Reagents for IVD applications must not only ensure analytical sensitivity and specificity, but also satisfy regulatory, standards, ...
In synthetic biology, molecular diagnostics, and drug discovery, DNA synthesis is a core technical step. Whether for oligonucleotide synthesis, gene synthesis, or in-vitro amplification and modification, high-quality raw reagents are essential. “For DNA Synthesis” grade reagents emphasize ...
In modern life sciences and drug development, protein sequencing is a key technology for revealing protein structure, modifications, and function. Whether by Edman degradation or mass spectrometry (MS/MS), the use of high-quality reagents is central to accuracy and reproducibility. “For ...
Nanoparticles are materials with key dimensions typically 1–100 nm. At this scale the surface-to-volume ratio explodes, so surface chemistry dominates: particles stick together more easily, react faster, scatter light differently, and can even show quantum-size effects (e.g., colloidal Au ...