Phospholipid Self-Assembly in Cocoa Butter Provides a Crystallizing Surface for Seeding the Form V Polymorph in Chocolate
Bibliographic record
Abstract
The addition of specific phospholipids to chocolate was recently shown to direct the crystallization of cocoa butter to the desirable triclinic form V polymorph, thus achieving the most desirable crystal structure in chocolate without the need for shear or complex temperature gradients. However, the mechanism of action of these phospholipids remains unknown. Herein, we determined the structure of self-assembled 1,2-dimyristoyl- sn -glycero-3-phosphocholine (DMPC) in chocolate and its fat phase, cocoa butter, to better understand its effects on the crystallization behavior and polymorphism of cocoa butter. Small-angle neutron scattering studies suggested that DMPC forms a variety of micelles in cocoa butter. A strong interaction between the DMPC micelles and the triglyceride palmitoyl-oleoyl-stearoyl glycerol (POS), the most abundant triglyceride in cocoa butter, which also directs the triclinic crystallization of the cocoa butter, was also observed by small-angle X-ray scattering (SAXS), interfacial tension measurements, and attenuated total reflectance-fourier transform infrared spectroscopy. This suggested that DMPC micelles serve as a seeding surface, templating form V crystal growth via its effects on POS. We propose a mechanism that involves a solid-state polymorphic transition form IV to V POS in the seeding crystals. Crystal strain and defects were observed in the templated nano- and microstructure observed by synchrotron microcomputed tomography and SAXS. These could affect the product’s properties, suggesting that a simple tempering step may still be required.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 source (direct Gemma or distilled Codex), 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".