Investigating Magnesium Carbonate as a Substitute for Titanium Dioxide in Ferrous Fumarate Premixes for Double Salt Fortification
Bibliographic record
Abstract
Objectives: The University of Toronto has developed an extrusion-based method for producing salt-sized premixes containing ferrous fumarate. These premixes are subsequently incorporated into salt, creating double-fortified salt, which has been deployed in large-scale studies in India and Tanzanian. Presently, titanium dioxide (TiO2) is used as the whitening agent in premixes to conceal the reddish color of ferrous fumarate. However, growing health concerns regarding TiO2 necessitate exploration of alternatives. Thus, this objective evaluates magnesium carbonate (MgO3) as a potential substitute for TiO2 as a whitening agent in micronutrient premixes. Methods: The study investigated how different amounts of MgO3 masked the reddish color of iron premixes using two methods. Microscopic imaging and L*a*b colorimetry analyzed the premix coating and its whiteness. Then, iodometric titration assessed the coating integrity after incorporating the premix into iodized salt. Results: The resulting premixes were analyzed and compared with iron premixes coated with TiO2 as standard. While MgO3 levels above 60% resulted in acceptable colour, the amount of magnesium may exceed suggested intake levels. Employing a layer-by-layer application of 40% MgO3 achieved the desired colour. Unfortunately, this method resulted in premixes larger than salt grain size. Consequently, different sizes of extruded iron particles were evaluated. Extruded iron particles with sizes ranging from 500 to 600 μm gave the best colour coverage particles. The whitest premixes were added to iodized salt to study the coating's effectiveness. Conclusions: Coating is essential to render the microcapsules white and protect the micronutrients. Using MgO3 as a masking agent is a viable alternative to TiO2 as the colour masking agent. A coating consisting of 41% MgO3 in gum Arabic-based suspension or soy stearin-based suspension is an effective colour masking layer. This formulation has the added benefit of providing magnesium, which is also deficient in many diets. As fortification of salt has been widely introduced as an effective intervention against micronutrient deficiency, replacing TiO2 with magnesium carbonate is prudent, given recent restrictions on TiO2. Funding Sources: The Natural Sciences and Eng. Research Council and Nutrition International.
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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 | 0.001 |
| 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".