Application Notes: LC

Enhancing the extraction of vitamins A and E in serum using simplified liquid extraction (SLE) significantly improves the LC–MS-MS detection of target compounds, all while preserving a simple and robust method.

Phospholipid removal proves to yield superior results as compared to a traditional protein precipitation step when analyzing a complex plasma matrix via LC–MS-MS. The results displayed a decrease in ion suppression, increased analyte sensitivity, and an improvement in column lifetime.

Enhancing the extraction of vitamins A and E in serum using simplified liquid extraction (SLE) significantly improves the LC–MS-MS detection of target compounds, all while preserving a simple and robust method.

Using oral fluid as the matrix, a viable and simple solid phase extraction method for a wide range of drugs is developed. Several oral fluid collection devices were evaluated to determine the effectiveness of the cleanup procedure, ultimately confirming that the method is both robust and widely applicable.

Improving and optimizing EPA Method 593 using solid phase extraction (SPE) enhances sensitivity and maximizes efficiency while screening by LC–MS-MS for different female birth control hormones present in drinking and waste water.

Using oral fluid as the matrix, a viable and simple solid phase extraction method for a wide range of drugs is developed. Several oral fluid collection devices were evaluated to determine the effectiveness of the cleanup procedure, ultimately confirming that the method is both robust and widely applicable.

An ultra-sensitive sample preparation technique using solid phase extraction (SPE) microelution 96-well plates effectively concentrates peptides and allows for cleanup of small volume.

A suite of unknown drug compounds from whole blood are analyzed by LC–MS-MS, requiring the need for an effective yet nonspecific cleanup technique. The resulting method demonstrates a simple and fast sample preparation procedure that is suitable for screening many compounds.

A suite of unknown drug compounds from whole blood are analyzed by LC–MS-MS, requiring the need for an effective yet nonspecific cleanup technique. The resulting method demonstrates a simple and fast sample preparation procedure that is suitable for screening many compounds.

Intact and reduced IgGs have been successfully retained and separated using a non-porous column. Potential applications of Presto columns for a single-injection separation of free drug, antibody, and antibody-drug complexes (ADCs) is also discussed.

This Application Note demonstrates the separation and quantification of beta-blockers, listed as prohibited substances by the World Anti-Doping Agency, in urine using the Agilent 1260 Infinity Analytical SFC System.

HPLC column stability is a critical factor. This note describes how the Agilent Poroshell HPH-C18 column performed brilliantly in an elevated pH mobile phases such as ammonium bicarbonate buffer.

This Application Note demonstrates the separation and quantification of beta-blockers, listed as prohibited substances by the World Anti-Doping Agency, in urine using the Agilent 1260 Infinity Analytical SFC System.

Characterization of glycosylation is a major quality parameter in the production of biotherapeutics. This note demonstrates the benefits of using a new, small particle TSKgel Amide-80 HILIC column which improves peak capacity and sensitivity for UHPLC and LC-MS analysis of labelled glycans.

In new drug development, the number of diverse chiral compounds is increasing and sensitive chiral methods are often needed quickly. Many new CSPs are available on the market making it challenging to select the most important ones for the initial screening stages and expedite method development. The focus of this study is to evaluate high selectivity CSPs and to suggest the best screening method with a limited number of high success rate chiral columns.

‘Old’ HPLC methods with long run times are being altered or surpassed by newer UHPLC or core-shell methods in order to save time and cost. In this application note we show how with the use of 3 simple equations transfer of older methods can be easily achieved onto newer core-shell particles. We show the example of a pharmaceutical drug and its impurities being reduced from a 30minute run time down to less than 10minutes. Using the calculations correctly means that no loss of resolution is seen even with the decrease in retention time.

‘Old’ HPLC methods with long run times are being altered or surpassed by newer UHPLC or core-shell methods in order to save time and cost. In this application note we show how with the use of 3 simple equations transfer of older methods can be easily achieved onto newer core-shell particles. We show the example of a pharmaceutical drug and its impurities being reduced from a 30minute run time down to less than 10minutes. Using the calculations correctly means that no loss of resolution is seen even with the decrease in retention time.

This Application Note demonstrate ultrafast gradients with an over 60 % reduction of analysis time using the Agilent 1290 Infinity II Multisampler with dual-needle function and alternating column regeneration.

This Application Note demonstrate ultrafast gradients with an over 60 % reduction of analysis time using the Agilent 1290 Infinity II Multisampler with dual-needle function and alternating column regeneration.

This application note describes techniques to increase sample throughput without compromising the accuracy of analysis during the monitoring of aggregate formation during biotherapeutic development

This application note describes techniques to increase sample throughput without compromising the accuracy of analysis during the monitoring of aggregate formation during biotherapeutic development

Previously, SFE and SFC were offline operations for pretreatment or analysis, respectively, and treated as completely separate workflows. This note, however, presents a flow diagram showing the integration of SFE-SFC processes from pretreatment to data acquisition in a single workflow, as well as an analysis of reduced coenzyme Q10.

This note describes the use of TSKgel UP-SW3000, 2µm SEC columns for the analysis of proteins, with data demonstrating the operation of these columns using a simple and well established method for use in both HPLC and UHPLC systems. TSKgel UP-SW3000 columns have superior resolution for proteins and the shorter column dimension, 4.6 mm ID × 15 cm, allows runs to be completed 2 times faster than its longer column dimension counterpart without compromising resolution and reproducibility.

This Application Note demonstrates the sensitive and rapid determination of Polycyclic Aromatic Hydrocarbons (PAHs) in tap water using the Agilent 1200 Infinity Series Online SPE Solution.

This Application Note demonstrates the sensitive and rapid determination of Polycyclic Aromatic Hydrocarbons (PAHs) in tap water using the Agilent 1200 Infinity Series Online SPE Solution.

Centrifugal Partition Chromatography (CPC) also known as Counter Current Chromatography (CCC) is a preparative, pilot and industrial liquid purification technique that does not require traditional solid supports. CPC was used to purify few mg of gingerol from crude extract.

This Application Note describes UHPLC methods to simultaneously separate and identify seven tannin compounds as aging markers in barrel-aged alcoholic beverages. The proposed methodology was applied to four different matrixes: whisky, brandy, rum, and tequila, to demonstrate a correlation between aging time and total tannin concentration level.

This Application Note shows the transfer of a standard HPLC method to a UHPLC method for the analysis of 13 DNPH-derivatized aldehydes and ketones. By transferring the method from HPLC to UHPLC, the analysis time and solvent consumption was reduced by approximately 90 %.