Liquid Chromatography (LC/HPLC)

Researchers employed advanced chromatography and mass spectrometry techniques to unravel the chemical components and metabolites of Lingbao Huxin Dan, pinpointing its therapeutic potential for cardiovascular ailments.

A recent study examined using liquid chromatography methods for determining analytes in antioxidative molecules.

Wolfgang F. Lindner and Martina Catani are the winners of the 17th annual LCGC Lifetime Achievement and Emerging Leader in Chromatography Awards, respectively. These awards honor the work of talented separation scientists at different stages in their career. The award winners will be honored in March in an oral symposium at the Pittcon 2024 conference in San Diego, California.

High performance anion-exchange chromatography coupled with pulsed amperometric detection (HPAEC-PAD) is a potential method of choice for the analysis of carbohydrates.

In this installment, I illustrate the impact of different gradient delay volumes when transferring a method between instruments and discuss some strategies that can be used to mitigate these challenges.

Scientists in Mexico developed a new method for detecting herbicides in agricultural soil, being based on techniques like 9-fluorenylmethyl chloroformate (FMOC-Cl) and ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS).

Weronika Hewelt-Belka, an assistant professor at Gdańsk University of Technology in Poland, answers questions about her research analyzing GM3 gangliosides in human milk, elucidating their molecular distribution and dynamic changes throughout lactation.

High performance liquid chromatography (HPLC) was paired with both diode array and fluorescence detection (DAD and FLD, respectively) to measure Edam cheese for its total and acid-soluble whey content.

This study of the perennial herb also known as madimak (or Indian knotgrass) aimed to simultaneously determine phenolic compounds to gain more insights into their antioxidant or antimicrobial capabilities.

A recent study from the Shangdong Academy of Chinese Medicine examined chicory using a novel UHPLC–HRMS technique and rats as the test subject.

Herbert Knauer founded his namesake laboratory equipment company with his wife Roswitha in Berlin in 1962.

Scientists from Utah and Ireland recently created a liquid chromatography–mass spectrometry (LC–MS) analytical method capable of detecting phototoxins in essential oils.

Researchers from Italy, Spain, and Turkey employed online high performance liquid chromatography (HPLC) to analyze various extracts of Leonurus cardiaca, revealing potent antioxidant properties and promising antibiofilm activity.

LCGC and Spectroscopy Editor Patrick Lavery spoke with Oligo Factory CEO Chris Boggess about the company’s recently attained compliance with Good Manufacturing Practice (GMP) International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH) Expert Working Group (Q7) guidance and its distinction from Research Use Only (RUO) and International Organization for Standardization (ISO) 13485 designations.

A review of advances in mRNA analysis using LC and LC–MS.

Scientists in Xi’an, China have created a novel system for the analysis of cell membranes, based around haloalkane dehalogenase protein tag (HALO)-tag technology. Their research was published in Talanta.

This experiment introduced a deep eutectic solvent developed in conjunction with a pH-induced phase transition combined with high performance liquid chromatography (HPLC) for efficient trace determination of bisphenol A (BPA) in water samples.

In this LCGC Blog, the author explores stationary phases that incorporate permanent or induced charges within, or alongside, hydrophobic alkyl silica type bonded ligands.

In addition, the company gained nearly 400 square meters of office space thanks to the renovation of a building adjacent to its Berlin headquarters.

Scientists from Hunan University of Chinese Medicine and Zhengzhou University in Zhengzhou, China recently created a new system for extracting catecholamines (CAs) in urine samples.

Researchers from the Chinese Academy of Medical Sciences and Peking Union Medical College categorize the cardioprotective effects and other characteristics of flavonoids from the species commonly known as Chinese rosewood.

This research introduces a novel chromatographic method for the simultaneous determination of bisoprolol fumarate, carvedilol, and furosemide in both their pure and pharmaceutical dosage forms, offering a cost-effective, time-saving solution for routine drug quality control analysis.

This review article discusses scientific rationales and current best practices in the pharmaceutical industry for performing chromatographic peak purity assessments (PPA). These activities are associated with the development and validation of liquid chromatographic (LC) stability-indicating analytical methods applicable to regulatory submissions of small-molecule drug candidates. The discussion includes a comprehensive overview of the PPA-related regulatory and scientific landscape and common industry approaches to obtain PPA results, as well as the strengths and weaknesses of PDA-facilitated ultraviolet (UV) PPA and other PPA techniques.

The gradient delay volume is arguably one of the most important, yet least appreciated, parameters that affect how gradient elution separations in LC work. This has implications both for method development and for method transfer during the lifecycle of a LC method. In this installment, I will review the concept of gradient delay volume, its physical connection to the LC instrument, and how it can impact method development and separation quality.

This paper proposes a new method of flash qualitative identification (FQI) to qualitatively identify a certain target component from a mixture within half a second by disusing the analytical column, which is a time-consuming unit in current chromatography instruments. First, a Noised Spectrum Identification (NSI) model was constructed for the data set generated directly by diode array detector (DAD) without the process in an analytical column. Then, a method called vector error algorithm (VEA) was proposed to generate an error according to the DAD data set for a mixture and a specific spectrum for the target component to be identified. A criterion based on the error generated by the VEA is used to give a judgement of whether the specific spectrum exists in the DAD data set. Several simulations demonstrate the high performance of the FQI method, and an experiment for three known materials was carried out to validate the effectiveness of this method. The results show that the NSI model concurs with the real experiment result; therefore, the error generated by the VEA was an effective criterion to identify a specific component qualitatively, and the FQI method could finish the identification task within half a second.

A variety of chromatographic techniques have been used to quantify the full range of acyl-CoAs, formed when a fatty acid bonds with coenzyme A, but added complexity and analysis time adversely affect the level of throughput.

Scientists from the Huazhong University of Science and Technology have developed a new method for analyzing quinolones in urine.

The Chromatographic Society will honor five scientists and academics next year, conferring its highest honor, the Martin Medal, to David McCalley and Fabrice Gritti.