Thermo-mechanical decolourization process for shrimp chitin (Pandalus borealis)
Bibliographic record
Abstract
Pandalus borealis is a thin-shelled shrimp species with medium pigmentation. The polysaccharide chitin, which makes up approximately 20 % of the shell, can be extracted and used in many different industries. The main extraction steps are deproteination and demineralization, followed by an assessment of the colour. White, off-white, or beige chitin is desired for most industrial applications. If required, residual pigmentation is typically removed in a decolourization step (DC) using oxidizing reagents or solvents. Disadvantages include safety and environmental concerns, unspecific oxidation reactions and high volatility of reagents. To date, a green process alternative is not documented. P. borealis chitin, deproteinated in alkali solution, does not require further DC. Enzymatic deproteination is nowadays preferred in the interest of sustainable processing, but it produces chitin with inferior colour quality. Based on the known thermal instability of the shrimp pigments and the porosity of chitin particles, the present study hypothesizes that the colour quality of enzymatically purified chitin can be enhanced by a washing process using high-shear and hot water. We develop a novel, chemical-free alternative for decolourization and assess its effectiveness compared to solvent and oxidizing reagents. Chitin properties are assessed by colorimetry, XRD, NMR, TGA, bulk density, and fat/water-binding capacities (FBC/WBC). Our findings suggest that the innovative thermo-mechanical DC process can produce a colour quality comparable to solvent DC without resulting in deacetylation, changes in crystallinity, or thermal stability. Thermo-mechanical DC enhanced WBC/FBC of chitin, which is an important property in hydrogel and drug delivery applications. • Acid-base methods produce chitin with lighter colour than green enzymatic methods. • Traditional bleaching methods enhance colour but damage chitin structure. • A green process alternative for chitin decolourization is presented. • Pigments are removed or degraded by high-shear, heat, and low-level chlorination. • New process enhanced water- and fat binding capacity of chitin.
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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 | 0.000 |
| 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".