A position-specific clustering algorithm has been developed that can outperform current model-based clustering methods and provide a fast and effective solution for peak matching in large label-free LC?MS data sets.
A position-specific clustering algorithm has been developed that can outperform current model-based clustering methods and provide a fast and effective solution for peak matching in large label-free LC–MS data sets.
Clustering provides a widely applicable method for recognizing patterns of similar observations within data. A study published in BMC Bioinformatics1 has presented an algorithm called MEDEA (M-Estimator with DEterministic Annealing) and demonstrated its usefulness when recognizing common peaks across LC–MS data sets for proteomic biomarker discovery.
The algorithm is an M-Estimator based, unsupervised algorithm designed to enforce position-specific constraints on variance during the clustering process. By limiting variation within a cluster according to that cluster’s position, the study reports the algorithm outperforms current model-based clustering methods, resulting in an implementation significantly more efficient, and hence applicable to much larger LC–MS data sets.
1. R. Fruehwirth, D.R. Mani and S. Pyne, BMC Bioinformatics, 12(358) (2011).
Accelerating Monoclonal Antibody Quality Control: The Role of LC–MS in Upstream Bioprocessing
This study highlights the promising potential of LC–MS as a powerful tool for mAb quality control within the context of upstream processing.
Using GC-MS to Measure Improvement Efforts to TNT-Contaminated Soil
April 29th 2025Researchers developing a plant microbial consortium that can repair in-situ high concentration TNT (1434 mg/kg) contaminated soil, as well as overcome the limitations of previous studies that only focused on simulated pollution, used untargeted metabolone gas chromatography-mass spectrometry (GC-MS) to measure their success.
Prioritizing Non-Target Screening in LC–HRMS Environmental Sample Analysis
April 28th 2025When analyzing samples using liquid chromatography–high-resolution mass spectrometry, there are various ways the processes can be improved. Researchers created new methods for prioritizing these strategies.
Potential Obstacles in Chromatographic Analyses Distinguishing Marijuana from Hemp
April 28th 2025LCGC International's April series for National Cannabis Awareness Month concludes with a discussion with Walter B. Wilson from the National Institute of Standard and Technology’s (NIST’s) Chemical Sciences Division regarding recent research his team conducted investigating chromatographic interferences that can potentially inflate the levels of Δ9-THC in Cannabis sativa plant samples, and possible solutions to avoid this problem.