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 ...
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 ...
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 ...
“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 ...
