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Showing 1-30 of 138 results
HPLC Analysis of Adenosine Monophosphate (AMP) and Adenosine Triphosphate (ATP) on SeQuant ZIC-HILIC
Separation of AMP (adenosine monophosphate); ATP (adenosine triphosphate)
Rapid Determination of Protein Binding Affinity Using Solid Phase Microextraction
Accurate protein binding affinities were measured using bioSPME more rapidly than membrane dialysis (RED) techniques. Binding affinities correlated to the reference values.
Bioanalytical Applications for SPME
BioSPME Tips enable direct 1-step sample handling of biofluids, eliminating the need for time-consuming sample preparation steps used in current bioanalytical analyses
Improved Recoveries and Lower Background for GC/MS/MS and LC/MS/MS Analysis of Pesticides in Green Tea
A procedure for cleanup of green tea extracts provides low background and allowed for the analysis of more pesticides at lower levels than QuEChERS. Uses less solvents and no toluene.
Derivatization and Separation of Aliphatic Amines
Derivatization of Aliphatic Amines - Results from the Supelco Ascentis Express column show higher peak resolution, and improved peak shapes than typical chromatograms.
HPLC Analysis of Proteins by Cation Exchange on Proteomix® WCX: Affect of Particle Size
Separation of Ribonuclease A from bovine pancreas, Type I-A, powder, ≥60% RNase A basis (SDS-PAGE), ≥50 Kunitz units/mg protein; α-Chymotrypsinogen A from bovine pancreas, essentially salt-free, lyophilized powder; Cytochrome c from bovine heart, ≥95% based on Mol. Wt. 12,327 basis;
BIOshell™ A400 Protein C4 U/HPLC Columns
BIOshell™ A400 Protein C4 columns contain 3.4 μm particles with 400 Å pores, which are derivatized with dimethylbutyl silane and exhaustively endcapped for optimum protein recovery.
Application Note – Peroxidase in Vegetables
Application Note: Peroxidase in vegetables – Visual determination after conversion of a specific substrate.
LC/MS Analysis of Illicit Bath Salts on Ascentis® Express HILIC, Fast Analysis
Separation of Butylone hydrochloride solution, 1.0 mg/mL in methanol (as free base), ampule of 1 mL, certified reference material; Ethylone hydrochloride, 1.0 mg/mL in methanol (as free base), ampule of 1 mL, certified reference material; Mephedrone hydrochloride solution, 1.0 mg/mL
Biogenic Amine Transporters
These distinct transporters, NET, DAT and SERT, respectively, are of particular clinical interest because they are the molecular targets for many antidepressants as well as drugs of abuse, such as cocaine and the amphetamines.
HPLC Analysis of Sugars by HILIC Chromatography using Ascentis® Express OH-5 Column with ELSD Detection
Separation of Dextrose, Pharmaceutical Secondary Standard; Certified Reference Material; Sucrose; Maltitol, Pharmaceutical Secondary Standard; Certified Reference Material
Chromatographic Selectivity
Harnessing the Power of Chromatographic Selectivity
Evaluation of Different Enzymes on Hydrolysis Efficiencies of Glucuronide Drug Metabolites in Urine
β-glucuronidase (GUS) enzymes are utilized to hydrolyze glucuronide (gluc) drug metabolites to the parent drug, facilitating analysis by LC-MS/MS.
Ascentis® Express ES-Cyano Reversed Phase U/HPLC Columns
Ascentis® Express ES-Cyano HPLC column is a high-speed, high-performance liquid chromatography column based on 90 Å Fused-Core® particles.
HybridSPE-Phospholipid Technology
This Sigma-Aldrich article discusses how the HybridSPE-Phospholipid Technology works and how the phospholipids are removed.
Monolithic Silica with Bimodal Pore Structure
Monolithic silica HPLC columns enable high-throughput analysis at low back pressure without loss of separation efficiency or peak capacity.
Chemoselective Purification Tags
Our long peptide purification utilizes a combination of chemoselective purification tags and standard RP-HPLC. The method is especially effective at removing impurities that are closely eluting or hidden under the isolated product peak
Benefits of Ascentis Express Phenyl-Hexyl over Biphenyl for the Separation of Pain Management Opiates
Although both biphenyl and phenyl-hexyl phases can resolve these compounds, the former exhibits excellent peak shape and substantially less silanol-derived ion exchange activity.
Developing HPLC Methods
We recommend every HPLC method developer have these four columns in their arsenal; Ascentis C18, Ascentis RP-Amide, Ascentis Phenyl and Discovery HS F5.
Ultra-High Performance Liquid Chromatography (UHPLC) with the Ascentis® Express Phenyl-Hexyl Column
Ultra-High Performance Liquid Chromatography (UHPLC) with the Ascentis® Express Phenyl-Hexyl Column
UHPLC/MS Analysis of Diazepam and Metabolites on Titan™ C18, Comparison of Flow Rate and Column Length
Separation of Oxazepam; Desmethyldiazepam, analytical standard; Temazepam, analytical standard; Diazepam
Ascentis® Express Biphenyl UHPLC and HPLC Columns
The bonded, densely endcapped, dimethyl-biphenyl stationary phase of Ascentis® Express 90 Å Biphenyl, based on fused-core particles, provides a stable, reversed phase packing with enhanced π-π and mild steric interactions due to the two sequential phenyl groups bonded to the
UHPLC/MS Analysis of Spice Cannabinoids on Titan™ C18
Synthetic cannabinoids (e.g. "Spice") are a type of designer drug that provides a cannabis-type high.
Separation of Steviol Glycosides by HPTLC: Introducing a New Stevia Extract Reference Material
HPTLC is an efficient method to determine Steviol Glycosides content in Stevia using our HPTLC plates and reference materials, including a new introduced Stevia extract reference material.
Determination of Sucralose in Soy Sauce using HPLC-ELSD following the Chinese National Standard (GB) Method
The most frequently used synthetic sweeteners are: saccharin, cyclamate, aspartame, and sucralose (E955), and this application illustrate the analysis of sucralose from soy sauce following the current Chinese national standard method.
HPLC Analysis of Xanthines on Purospher® STAR RP-18 endcapped
Xanthine is a purine base found in most human body tissues and fluids as well as in other organisms. Methylated xanthines (methylxanthines), which include caffeine, paraxanthine, theobromine, and theophylline, commonly used for their effects as mild stiµlants and as bronchodilators
Evaluation of LCMSMS Deuterium Scrambling in Clinically Significant Small Molecules
LC-MS/MS is a powerful tool that brings numerous benefits to the clinical sample analysis arena. However, due to the complexity of the instrumentation there are some unique challenges that also accompany these benefits. Even following sample extraction and cleanup, matrix
Ascentis® Express C8 U/HPLC Columns
When a C18 doesn′t give the desired separation, or your sample contains compounds that are known to be difficult to retain or resolve on a C18, consider changing to an Ascentis® Express C8 column.
LC/MS Analysis of Nicotine and Metabolites on Kromasil® Eternity™ C18 (Analyte Set 1)
Separation of (+)-Anabasine hydrochloride solution, 1.0 mg/mL in methanol (as free base), ampule of 1 mL, certified reference material; S(−)-Nicotine solution, 1.0 mg/mL in methanol, ampule of 1 mL, certified reference material; (S)-N-Nitrosoanabasine (NAB) solution, 1.0 mg/mL in methanol, ampule
HPLC Analysis of Z-Drugs on Ascentis® Express ES-Cyano 2.0 μm
An rapid method for the siµLtaneous determination of the Z-drugs or sleep aids: zopiclone, zolpidem, and zaleplon is presented here. The need for greater analytical capacity and throughput for the analysis of sleep aid medicines (Z-drugs) in forensic toxicology laboratories
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