What reagent grades, purity labels and specifications mean: ACS/AR, HPLC, electronic grade and tag-grade proteins, in 190+ guides from Aladdin Scientific.
Labels such as “purum,” “puriss.,” and “p.a.” are frequently seen on chemical reagent labels and in product catalogs. Purum is commonly translated as “pure” or “pure grade,” but it is not a standardized grade that is uniformly applied across suppliers or associated with a ...
In tissue engineering research, materials are used not only as reaction raw materials but may also come into direct contact with cells, encapsulate cells, form three-dimensional scaffolds, or participate in the construction of bioinks and injectable hydrogels. Therefore, the evaluation of these ...
Purity is an important indicator in reagent specifications used to characterize the target component, target element, active component, or specific quality attribute. In actual product labeling, purity does not always equal the mass percentage of a single compound. Its meaning may be jointly ...
Electronic-grade reagents are mainly used in semiconductors, display panels, photovoltaics, light-emitting diodes, printed circuit boards, electronic components, precision cleaning, and high-end trace analysis. Their main difference from ordinary laboratory reagents is not simply higher assay or ...
The AVI-tag grade is a product quality and technical standard level established around the AviTag and the biotin–streptavidin system. This grade emphasizes achieving highly efficient, quantitative, and site-specific biotinylation of target proteins in advanced applications such as protein ...
T7 tag grade is a product quality and technical standard system built around the T7 short-peptide epitope tag and specific anti-T7 antibody–based detection. This grade emphasizes, in applications such as recombinant protein expression verification, qualitative or semi-quantitative detection, ...
The c-Myc tag grade is a product quality and technical standard established around the c-Myc epitope tag and the anti–c-Myc immunorecognition system. This grade emphasizes achieving sensitive, specific, and quantitative immunodetection and spatial localization of target proteins in molecular ...
Fc tag grade is a product quality and technical standard level established around Fc (antibody constant region) fusion tags, Fc affinity ligands such as Protein A/G, and Fc functional assay systems. This grade emphasizes systematic control of key factors in applications including recombinant ...
GST tag grade is a product quality and technical standard level established around the GST (glutathione S-transferase) fusion tag, glutathione-based affinity media, and GST-based functional/interaction assay systems. This grade emphasizes systematic control of key factors such as GST fusion ...
FLAG tag grade is a product quality and technical standard defined around the FLAG short peptide epitope tag, anti-FLAG antibodies/affinity media, and the corresponding immunodetection and immunoaffinity purification systems. This grade emphasizes systematic control of key factors such as FLAG ...
HA tag grade is a product quality and technical standard level established around the HA (hemagglutinin) short peptide epitope tag and its associated immunodetection system. This grade focuses on the performance of the HA tag and its matched antibodies/affinity media in terms of specificity, ...
His tag grade is a product quality and technical standard level defined around the His (polyhistidine) fusion tag and immobilized metal affinity chromatography (IMAC) systems. This grade focuses on recombinant protein expression, affinity purification, and downstream structural/functional ...
MBP tag grade is a product quality and technical standard level established around MBP (maltose binding protein) fusion tags and their maltose/starch-based affinity chromatography systems. This grade emphasizes performance of the MBP tag, the corresponding affinity media and buffer systems, and ...
Strep II tag grade is a product quality and technical standard defined around the Strep-tag II peptide and engineered streptavidin-type affinity systems (for example, Strep-Tactin–type media). This grade emphasizes high-specificity binding, mild elution, and low background for Strep ...
SUMO tag grade is a product quality and technical standard defined around SUMO (small ubiquitin-like modifier) fusion tags, their associated affinity purification systems, and SUMO protease–mediated tag removal processes. This grade emphasizes improving solubility and folding quality during ...
In scientific research and production, the same chemical can yield completely different experimental results if its purity and impurity profile are not the same. A “grade” is essentially a combination of convention and standardized description for purity and impurities. It allows data from ...
In the domestic market, the terms “High-purity, High Purity, Extra pure, EP are commonly used to describe a class of high-grade reagents whose purity and impurity control are clearly superior to conventional analytical reagent (AR) grade. Many textbooks characterize high-purity reagents as ...
The “Ultra pure” grade generally refers to reagents that, on top of conventional high-purity specifications (for example, solids/organic compounds typically with an assay of ≥99%, and water or acids characterized by conductivity or impurity levels), are subjected to stricter and ...
Distillation grade reagents generally refer to products that, during manufacturing, undergo one or more stages of distillation or redistillation (fractional distillation / redistillation) to remove low-boiling and high-boiling impurities, moisture, and certain reactive impurities. The result is ...
“Suitable for Inorganic Trace Analysis” (also referred to as trace analysis grade/ultra-trace grade) is a suitability label used by suppliers for reagents intended to measure ultra-low levels of elements—typically metals and metalloids at the ppb–ppt level—by ICP-MS, ICP-OES, AAS, ion ...
“For DNA synthesis” is a functional grade formulated specifically for oligonucleotide (oligo) chemical synthesis and related enzymatic workflows. It is not merely “higher purity”; it prioritizes trace-level attributes that directly influence coupling reactions:
In protein and nucleic-acid workflows, dialysis is commonly used for buffer exchange, desalting, and removal of small molecules (e.g., salts, denaturants, inhibitors). The sample and the dialysate are separated by a semipermeable membrane: small molecules diffuse into the dialysate while ...
UPLC (UltraPerformance LC) is Waters’ trademarked name (introduced in 2004) for its ultra-high-efficiency liquid chromatography technology. In essence, it corresponds to what the industry commonly calls UHPLC (ultra-high-performance liquid chromatography). Technically the two are equivalent: ...
Silylation replaces the labile hydrogens in a molecule (–OH, –COOH, –NH₂, =NH, –SH, etc.) with silyl groups—most commonly trimethylsilyl (TMS) or tert-butyldimethylsilyl (TBDMS/tBDMS). The resulting derivatives are more volatile, less polar, and more thermally robust, which improves ...
"Environmental analysis reagents" are chemical reagents specifically designed and graded for the collection, pre-treatment, and qualitative and quantitative determination of pollutants in environmental samples such as drinking water, surface water, groundwater, wastewater, soil, air ...
“For Preparative Chromatography” reagents and solvents are quality-controlled specifically for preparative chromatography—i.e., purifying target compounds from the milligram up to kilogram scale.
A qNMR standard is a reference material specifically prepared and certified for quantitative nuclear magnetic resonance (qNMR). Its certificate typically provides.
“for ULC-MS” (also written ULC/MS or UHPLC-MS grade) denotes a solvent/additive quality system intended for ultra-high-performance LC–MS (UHPLC-MS). Its defining feature is not merely “chemical purity,” but fitness-for-purpose in mass spectrometry.
“Reagents for elemental analysis” are high-purity chemical reagents and certified standards designed to determine elemental contents in samples—at major, minor, and trace levels. They span a complete workflow from sample pretreatment (dissolution/digestion/purification) and instrumental ...
Overview of Reagents for Coating (for Coating Reagents)
HPLC Plus is a high-purity grade of reagents specifically designed for High-Performance Liquid Chromatography (HPLC) applications. These reagents are manufactured with tighter quality control standards to ensure minimal impurities, making them suitable for the most sensitive HPLC analyses.
When a reagent is labelled as for chromatography or chromatography standard grade, it means that the reagent has been manufactured, purified and tested to meet requirements specific to chromatographic applications (such as HPLC, GC, LC-MS) rather than general laboratory uses. The emphasis is ...
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NF grade means the material meets the quality standard in a National Formulary (NF) monograph, part of the combined USP–NF compendium maintained by the U.S. Pharmacopeia (USP). NF primarily covers excipients (inactive ingredients) with documentary standards for identity, purity, and tests.
Premium pure is an Aladdin-defined quality tier for high-purity, tightly specified general-purpose reagents, with documented impurity controls; where applicable, products are co-labeled to external standards (e.g., ACS, Ph. Eur.) and supplied with lot-specific CoAs.
UV/VIS absorption spectroscopy is widely used for quantitative analysis, purity assessment, reaction kinetics, and protein/nucleic acid concentration measurements. The technique is highly sensitive to solvent/reagent background absorbance, trace impurities, particulates/bubbles, and extractables ...
Atomic absorption (AA), inductively coupled plasma (ICP-OES/ICP-MS), ion chromatography (IC), and total organic carbon (TOC) are core techniques for trace/ultratrace analysis and water-system evaluation. They are highly sensitive to “blank signal,” “method compatibility,” and the ...
Plant cell/tissue culture is highly sensitive to formulation impurities, oxidative by-products, and microbial contamination. Trace metals, residual organic solvents, peroxide in gelling agents, pH drift, and photodegradation can all cause callus induction failure, reduced organogenesis ...
Ultra-dry grade reagents are products that are qualified for extremely low water content, typically in the single‑ to tens‑of‑ppm range at release (e.g., ≤20–50 ppm for many solvents; some salts are supplied as rigorously anhydrous solids). Because there’s no single global standard, ...
“Optical glass grade” ( is a supplier-defined quality label for solid inorganic raw materials (typically high-purity oxides and halides) intended for melting optical glasses or depositing optical thin films. The emphasis is on ultra-low, color-forming metal impurities (Fe, Co, Ni, Cu, ...
Superconductor grade" refers to reagents such as salts, oxides, organometallic/metal–organic precursors, and powders, which are specifically manufactured and quality-controlled for the preparation of superconducting materials and devices. The emphasis is on:
“Pesticide residue grade” (often labeled for pesticide residue analysis, PRA) refers to solvents and auxiliaries produced and QC-tested specifically to minimize background signals and interferences when measuring trace-level pesticide residues—typically by GC-ECD, GC-MS(/MS), or ...
In China’s reagent system, “Spectrum pure” (SP) is a purpose-specific purity class used for spectroscopy. The label appears in the national classification standard GB/T 37885-2019 “Chemical reagent—Classification” as one of the recognized categories alongside high-purity, primary ...
SFA is a supplier-designated grade for reagents intended for general analytical use. Products labeled SFA are tested against a defined panel of quality attributes (assay/purity plus limits on key impurities) so they do not introduce significant analytical error in common methods (titrations, wet ...
“Semiconductor-grade” (often called Electronic Grade) refers to chemicals formulated and verified for microelectronics manufacturing, with ultra-low metallic ions, anions, particles, organics/TOC and extractables — typically controlled at ppb to ppt levels depending on the chemical and the ...