Crystallization and Polymorphism of 1,3‐Acyl‐Palmitoyl‐<i>rac</i>‐Glycerols
Bibliographic record
Abstract
Abstract Crystallization and melting behavior, small‐angle X‐ray scattering, X‐ray powder diffraction and infra‐red absorbance were measured for nine 1,3‐acyl‐palmitoyl‐ rac ‐glycerols (1,3‐acetoyl‐, ‐butyroyl‐, ‐hexanoyl‐, ‐octanoyl‐, ‐decanoyl‐, ‐lauroyl, ‐myristoyl‐ and ‐oleoyl‐palmitoyl‐ rac ‐glycerol and 1,3‐dipalmitoyl‐glycerol). All but one of the prepared 1,3‐diacylglycerols (1,3‐DAG) were β‐stable with 1,3‐acetoyl‐palmitoyl‐ rac ‐glycerol being the exception (β′‐stable). Small‐angle X‐ray scattering indicates that molecules in β‐tending diacid 1,3‐DAG adopt a herringbone‐type configuration similar to monoacid 1,3‐DAG. In this configuration acyl chains of the same length associate and regular chain‐end matching between terminal methyl groups delineate lamellae. In contrast, molecules in crystalline 1,3‐acetoyl‐palmitoyl‐ rac ‐glycerol are oriented similar to those of 1(3)‐monoacylglycerol. Interestingly, DSC curves indicate five of the nine diacid compounds have meta‐stable forms—suggesting these forms are quite common for diacid 1,3‐DAG. Meta‐stable forms are observed in the melting curve when the difference in length between acyl chains is large (1,3‐acetoyl‐, ‐butyroyl‐ and ‐hexanoyl‐palmitoyl‐ rac ‐glycerol), and in the crystallization curve when the difference is moderate (1,3‐decanoyl‐ and ‐lauroyl‐palmitoyl‐ rac ‐glycerol).
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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".