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How does targeted metabolomics differ from nontargeted metabolomics?

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Diagram illustrating metabolism with two sections: anabolic reaction on the left shows energy used to build larger molecules from smaller ones, while catabolic reaction on the right shows larger molecules breaking down into smaller molecules with energy released. — Metabolomics In anabolic reactions, a cell uses energy to combine small molecules into larger molecules. In catabolic reactions, molecules are broken down, and energy is released.

In metabolomics, targeted and nontargeted approaches serve distinct analytical purposes.1

Targeted Metabolomics

Targeted metabolomics focuses on querying predefined panels of specific biochemicals. These assays are highly sensitive, specific, and provide reproducible quantitative data, particularly when utilizing isotopes for labeling and narrowly focused instrumental methods.2

Nontargeted Metabolomics

In contrast, nontargeted approaches aim to capture a broad portrait of metabolism. Because these methods are generally less rigorously quantitative, they are primarily used for discovery applications—such as comparing drug-treated cells against controls to identify changing metabolites.2

This approach often generates massive datasets, including known mammalian metabolites, food additives, and unknown substances. This creates a high-dimension, low-sample-size dilemma, necessitating careful statistical treatment to avoid false discoveries. While targeted methods offer precision for known targets, nontargeted methods provide the comprehensive scope required for exploratory systems biology.2