Chemical-constituent diversity of <i>Tridax procumbens</i>
Bibliographic record
Abstract
Three new phytochemicals, a polyacetylene, 1,2-dihydrodendroarboreol B (1), an ionone derivative, (3S,5R,6S,7E)-3-tetradecanoate-5,6-epoxy-β-ionone (4), and a flavonol diglycoside, quercetagetin-3,6,4′-trimethoxy-7-O-neohesperidoside (38), along with 35 known compounds with diverse structures, were isolated from the EtOH extract of the aerial parts of Tridax procumbens. The structures of 1, 4, and 38 were determined on the basis of comprehensive methods including UV, IR, NMR, HR-ESI-MS, and CD, and by comparison of the spectroscopic data with those reported for structurally related compounds. Compounds 4, (3S,5R,6S,7E)-5,6-epoxy-3-hydroxy-7-megastigmene-9-one (5), and icariside B 1 (12) were tested for their abilities to inhibit SGC-7901 and HL-60 cells. The antioxidant activities of quercetagetin-3,6,4′-trimethoxyl-7-O-β-D-glucopyranoside (36), quercetin-3-methoxyl-4′-O-β-D-glucoside (37), and 38 were evaluated by measuring their free-radical-scavenging effects, using the DPPH free-radical method.Key words: Tridax procumbens, polyacetylene, ionone, flavonol, cytotoxicity, antioxidant activities.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".