Determination of Artepillin-C in Brazilian Propolis by HPLC with Photodiode Array Detector
Bibliographic record
Abstract
A method for the determination of artepillin-C using HPLC coupled with photodiode array (PDA) detector was developed. Artepillin-C is abundantly present in Brazilian propolis of Baccharis species origin. The chromatographic separation was performed on a Mightysil RP-18 GP II column (150 mm × 4.6 mm, 5.0 ?m; Kanto Chemical Company Limited), and column temperature was maintained at 40°C. The mobile phase was a linear gradient elution of 0.5% aqueous acetic acid (A) and acetonitrile (B) at a flow rate of 1.0 ml/min. The chromatogram was monitored at 320 nm. The calibration range of artepillin-C was 0.75-2500 ?g/ml (r2 = 0.9991). The limit of detection (LOD) and limit of quantification (LOQ) were 0.50 ?g/ml and 0.75 ?g/ml, respectively. The intra-day and inter-day precision of the assay (RSD) were in the range 1.28-5.60% and 1.45-6.75%, respectively. The artepillin-C content in Brazilian propolis is an important factor in ensuring the quality of Brazilian propolisof Baccharis species origin. This method was used to determine artepillin-C content in Brazilian propolis.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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".