Chiral LC-PDA-ORD Method for The Separation of Linagliptin Enantiomers On Coated Polysaccharide Based Amylose Tris (3, 5-Dimethylphenylcarbamate) Stationary Phases
Bibliographic record
Abstract
Chiral normal phase high performance liquid chromatographic (chiral-HPLC) was designed and verified for the separation of linagliptin enantiomers using coated polysaccharide chiral stationary phases. The stationary phase was amylose tris (3, 5-dimethylphenylcarbamate) (250x4.6mm, 5 µm), while the mobile phase was a mixture of 50:50:0.1% v/v. With a flow rate of 1 mL/min, orthophosphoric acid was mixed with hexane, isopropyl alcohol, and diethyl amine to achieve a pH of 5.2. The detection was seen at 225 nm. The optical rotatory dispersion (ORD) polarimeter was connected in series to the PDA outlet in order to determine the enantiomer conformation. The linagliptin retention times were found to be 5.454 and 8.772 minutes. Between 3.9 and 23.4 µg/ml, enantiomers were discovered to be linear, with a correlation coefficient of 0.9995. This method was validated in terms of linearity, LOD, LOQ, precision, accuracy, and robustness studies in accordance with ICH requirements. Novelty: The proposed analytical method for the chiral analysis of linagliptin can be used by pharmaceutical industries quality control departments.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".