| Item | Details |
|---|---|
| Platform | Q Exactive HF-X high-resolution MS · polarity-switching acquisition |
| Identification Strategy | Dual matching against public databases and in-house libraries, covering polar and non-polar metabolites |
| Applicable Matrices | Blood (serum/plasma) · tissue · cells · urine and other matrices |
| Differential Screening | Default FC ≥ 1.5 and p < 0.05; or VIP ≥ 1 and q ≤ 0.05 (strategy auto-selected based on permutation-test results) |
| Module | Core Methods & Metrics | Key Outputs |
|---|---|---|
| Data Preprocessing | Peak picking, retention-time correction and alignment in Compound Discoverer; TIC normalization, missing-value filtering and imputation, Pareto scaling | Metabolic-feature quantification matrix |
| Quality Control | Global PCA / PLS-DA, QC-sample correlations (generally > 0.99) and pairs plots, sample-intensity boxplots, HMDB level-3 classification statistics | QC figure sets, classification statistics tables |
| Univariate Stats | Fold change; Welch's t-test / Wilcoxon test; BH-adjusted p-values (padj) | Volcano plots, classified volcano plots, full metabolite statistics tables |
| Multivariate Stats | PCA / PLS-DA / OPLS-DA modeling; 200 permutation tests; VIP score calculation | Score plots, permutation-test plots, VIP Top-25 bar charts |
| Differential Screening | Default FC ≥ 1.5 and p < 0.05; or VIP ≥ 1 and q ≤ 0.05 (strategy auto-selected based on permutation-test results) | Differential metabolite lists, up/down-regulation counts |
| Abundance Analysis | Hierarchical clustering; complex heatmap of top-50 significant metabolites; abundance analysis; Spearman correlation; Z-score normalization | Cluster heatmaps, correlation plots, abundance plots |
| Functional annotation | KEGG level 1–3 annotation and enrichment; Sankey diagrams, differential abundance score (DA Score), pathway-impact topology analysis, chord / donut plots / regulatory networks | KEGG enrichment figure sets and result tables |
| HMDB / SMPDB | HMDB and SMPDB enrichment; single-metabolite pathway analysis; pathway–metabolite networks | SMPDB enrichment figure sets and result tables |
| Disease & Biomarkers | Metabolite–disease association enrichment; ROC curves and AUC ranking; Venn overlap analysis of differential metabolites for multi-group comparisons | ROC plots, AUC ranking tables, Venn diagrams |












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