The secrets of life lie in the molecular flexibility.

Welcome to Prof. Mariusz Jaremko's research group, the

Flexible Systems Lab!

Our research group works mainly on metabolites which are important for human health, and our current main focus in this discipline is oriented towards food, food safety, food quality, and food fraud by utilizing state-of-the-art instrumentation in metabolomics studies. We are also working on aggregation of amylin, a biological peptide that is connected tightly with diabetes II, a disease that is closely related to unhealthy diets. So, food science and the consequences of the food we eat are one of the main areas which the group Flexible Systems investigates. We are also working to develop methods and pulse programs in Nuclear Magnetic Resonance (NMR) that allow us to uncover obscured metabolites and to detect them at lower concentrations, in order to understand metabolic pathways better. 


Why the name Flexible Systems?

It's simple; because metabolites, as well as amylin and its analogues, are very flexible systems i.e. amylin does not have a defined 3D structure, and in the case of the small molecules and metabolites we study, while they do have defined structures, they often exhibit very high levels of dynamic flexibility due to their size.

Untangling untidy folds to understand diseases

Copper ions could play a key role when peptide folding goes wrong and leads to harmful aggregates.

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Picking the best methods for metabolomics research

Comparison of different nuclear magnetic resonance spectroscopy methods has helped to identify the most robust approach for studying different types of biomolecules.

Latest Publications

Untargeted Metabolomic Profiling and Antioxidant Capacities of Different Solvent Crude Extracts of Ephedra foeminea

by Ruba Al-Nemi, Arwa A. Makki, Khaled Sawalha, Dina Hajjar, Mariusz Jaremko
Original Article Year: 2022 DOI: https://doi.org/10.3390/metabo12050451

Abstract

Ephedra foeminea is a traditional medicinal plant used in the Eastern Mediterranean region. This study aims to investigate the chemical profiles of different solvent extracts of E. foeminea via an untargeted metabolomics approach, alongside determining their antioxidant capacities. E. foeminea samples collected from Jordan were macerated in solvents of varying polarities; dichloromethane/methanol, methanol, ethanol, ethyl acetate, and acetone. The crude extracts were subjected to comprehensive chemical profiling and metabolomics study using Gas chromatography–Mass spectrometry (GC–MS), Liquid chromatography–Mass spectrometry (LC–MS), and Nuclear Magnetic Resonance (NMR). The obtained data were analyzed using Venn diagrams, Principle Component Analysis (PCA), and Metabolite Enrichment Set Analysis (MESA). ABTS assay was performed to measure the crude extracts’ antioxidant activity. MESA revealed the dominant chemical groups as amino acids, fatty acids, carboxylic acids, and carbohydrates. Results indicated that dichloromethane/methanol and methanolic extracts had the most distinct composition as well as the most unique compounds. The methanolic extract had the most potency (IC50 249.6 µg/mL) in the ABTS assay. However, no significant differences were found. In conclusion, solvents influenced the recovery of metabolites in E. foeminea and the antioxidant activity of the E. foeminea methanolic extract could be correlated to the abundant presence of diverse bioactive compounds.