Agilent Manuals

This report outlines preliminary methodology and results for the analysis of four samples for all three isotopes of sulfur in carbonate matrices using the 7500ce Octopole Reaction System (ORS) with xenon as the cell gas. Xenon was used to react with oxygen in order to attenuate the O2-derived polyatomic interferences at masses 32, 33, and 34. Consequently, each sulfur isotope was analyzed on-mass, leading to highly reproducible results.

This Application Note describes the performance of the system using a 7-peptide sample and a tryptic digest of four different proteins.

This application describes how RRHT columns allowed for the rapid development of methods for selected endocannabinoids.

This work demonstrates that Eclipse Plus C18 can be used for high-performance liquid chromatography (HPLC) separation of difficult to separate nitrogen-containing compounds without the use of triethylamine (TEA), which provides a new method for separating such compounds. In addition, the low end-group activity of Eclipse Plus C18 makes it a preferred HPLC column for analysis of pharmaceuticals and other amine-containing compounds.

The document describes an improved method for analyzing opioids, cocaine, and cocaine metabolites from blood using solid phase extraction followed by LC/MS.

Nanospray LC-MS analysis of dextromethorphan (DEM) and its metabolites was performed using the Agilent 1200 Series HPLC-Chip/TOF system. The high sensitivity TOF in combination with automated nanospray HPLC-Chips enabled the detection of all DEM metabolites at concentration levels 100-fold lower than normal. The system response was linear over a wide concentration range for metabolites even when spiked into human plasma and urine. The LODs for real-life samples were in the high attomol to low femtomol range. Sample preparation was simplified using acidic precipitation by perchloric acid and a short centrifugation step. The simplified sample preparation, accurate mass measurements, excellent chromatographic reproducibility, and easy-to-use nanospray chip system make this setup optimal for routine use, allowing for higher throughput and reduced sample preparation costs.

This article introduces how to use Agilent 1200 series LC system for impurity analysis, and gives the structure elucidation method of impurities

This Application Note briefly describes the advantages of mass-based fraction collection compared to time and peak based fraction collection in combination with the Agilent 1200 Series purification system and the Agilent 6100 Single Quadrupole LC/MS

This document compares the performance differences in analyzing vitamins B2 and B6 using liquid chromatography and fluorescence detection. It compares the Agilent 1100 Series LC system with the Agilent 1200 Series Rapid Resolution LC system. The new column technology significantly improves performance, including faster run time, lower detection limit, and better resolution.

This article describes an analytical method for the detection of cannabinoids in oral fluid. The method utilizes an Agilent 5975 GC/MS instrument and allows for the simultaneous determination of Δ9-tetrahydrocannabinolic acid A (THCA-A), tetrahydrocannabinol (THC), cannabinol (CBN), and cannabidiol (CBD) in oral fluid samples. The method achieves the required sensitivity for the detection of THC, CBN, CBD, and THCA-A in oral fluid specimens taken from a habitual marijuana smoker.

This application describes the use of Agilent ZORBAX Rapid Resolution (RR) and Rapid Resolution High Throughput (RRHT) technology to separate a variety of nitrogen-containing drugs used to treat heart disease. This method can quickly achieve the three main goals of speed, resolution, and sensitivity, and can choose different column configurations as needed.

This paper presents seven examples of pharmaceutical analyses employing ZORBAX Eclipse Plus C8 columns. Eclipse Plus C8 is an excellent starting point for method development because of its excellent peak shape for bases, acids, and neutrals. Excellent peak shape contributes to better peak resolution. Eclipse Plus C8 exhibits different selec- tivity compared to Eclipse XDB C8 and Eclipse Plus C18. The shorter aliphatic C8 chain is less retentive than a C18 chain and can significantly cut analysis time compared to C18. Additionally, there is a wide variety of column con- figurations available for all analytical, rapid-resolution (RR), and high-throughput analyses. Several of these examples are scaled down from analytical methods to RR methods by substituting the longer column with a RR column. This combination of excellent peak shape and scalability to high-throughput methods make Eclipse Plus C8 a valuable tool to increase productivity wherever HPLC is used.

In this work, a collision energy ramp is used in conjunction with an ion trap mass spectrometer to generate reproducible product ion spectra. For the purpose of identifying compounds in real samples, the generation of product ion spectra in those samples is also carried out using ramped collision energy. The process of confirmation includes the generating of compound spectra in the sample data, followed by NIST- based scoring of Fit, Reverse Fit, and Purity matching of library spectra. Searching of the MS spectra is not included because matrix interferences can result in poor scoring. Besides, the precursor ion spectra search is also not included because the search may result in overlapping with other compounds.

This article introduces ten common pitfalls in DNA microarray analysis