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Ethyl carbamate levels resulting from azodicarbonamide use in bread
B J Cañas1, G W Diachenko, P J Nyman
1Division of Natural Products (HFS-347), US Food and Drug Administration, Washington, DC 20204, USA.
This study looked at how adding azodicarbonamide (ADA) to bread affects the levels of ethyl carbamate (EC), a compound that may pose health risks. Researchers found that using ADA at the approved level of 45 mg/kg increased EC in both commercial and lab-baked breads. Lower amounts of ADA had smaller effects. Adding ascorbic acid with ADA reduced EC formation, while urea increased it. Toasting bread that had been treated with ADA or urea led to even higher EC levels. The results suggest that bread-making conditions, such as ADA concentration and fermentation time, influence how much EC is formed.
Area of Science:
- Food chemistry and safety
- Bread additive effects
- Toxicological risk assessment
Background:
Additives are commonly used in food production to improve texture and appearance. Azodicarbonamide (ADA) is approved in the U.S. for use in flour at up to 45 mg/kg. Prior research has shown that ADA can influence bread properties, but its effect on ethyl carbamate (EC) levels remains unclear. EC is a compound of concern due to potential health risks. While ADA's role in dough conditioning is known, the extent to which it increases EC levels in finished bread is not well understood. This uncertainty motivated the current study to quantify EC formation from ADA use in both commercial and laboratory settings. Existing studies have examined EC formation from other additives, but ADA's contribution remains understudied. The need to assess EC levels arises from its potential toxicity and regulatory scrutiny. Bread fermentation and baking processes may influence EC formation, but the mechanisms are not fully understood. This gap in knowledge drove the investigation into how ADA interacts with bread-making variables.
Purpose Of The Study:
The study aimed to determine how the addition of azodicarbonamide (ADA) affects ethyl carbamate (EC) levels in bread. Bread is a widely consumed food, and additives like ADA are used to enhance dough properties. However, EC formation from ADA has raised safety concerns. The researchers sought to measure EC increases in both commercially produced and laboratory-baked breads. They focused on how ADA concentration and fermentation time influence EC levels. The study also examined the role of other ingredients, such as ascorbic acid and urea, in EC formation. By comparing commercial and homemade breads, the researchers aimed to assess real-world variability. The goal was to provide data for regulatory and safety evaluations of ADA use in flour. This work addresses a specific gap in understanding EC formation from ADA in bread.
Main Methods:
The researchers tested bread samples with and without azodicarbonamide (ADA) added at different concentrations. They prepared both commercial and laboratory-baked breads to compare EC levels. Commercial breads were analyzed for EC content after adding 45 mg/kg of ADA. A bread machine was used to bake bread in the lab under controlled conditions. The study measured EC levels using analytical techniques to detect microgram-per-kilogram changes. Fermentation time was varied to assess its impact on EC formation. Ascorbic acid and urea were added in separate trials to observe their effects on EC levels. Toasting was also tested as a post-baking step to see how it influenced EC content. The researchers documented all variables to ensure reproducibility and accuracy in their findings.
Main Results:
The addition of 45 mg/kg azodicarbonamide (ADA) increased ethyl carbamate (EC) levels in commercial bread by 1–3 µg/kg. A similar increase was observed in breads baked in the lab using a bread machine. Lower ADA concentrations, such as 20 mg/kg, caused minimal EC increases in commercial products but a 2.3 µg/kg increase in machine-baked bread. Adding 100 mg/kg ascorbic acid with ADA reduced EC formation compared to ADA alone. Urea addition also increased EC content in bread samples. Toasting bread that had been treated with ADA or urea led to even higher EC levels. The EC increase was most strongly linked to ADA concentration and fermentation duration. These findings suggest that bread-making conditions significantly influence EC formation from ADA.
Conclusions:
The study found that azodicarbonamide (ADA) can increase ethyl carbamate (EC) levels in bread, depending on the concentration and baking conditions. Commercial breads showed small EC increases at 45 mg/kg ADA, while machine-baked breads showed similar results. Lower ADA concentrations had less impact on EC levels in commercial products but still affected machine-baked breads. Ascorbic acid and urea addition influenced EC formation, with ascorbic acid reducing increases. Toasting bread after ADA or urea addition led to higher EC levels. These findings suggest that bread-making variables play a role in EC formation. The researchers propose that EC levels are sensitive to both ADA concentration and fermentation time. They note that EC increases are not uniform across all bread types. These results may inform future assessments of ADA use in food production.
Frequently Asked Questions
Adding 45 mg/kg azodicarbonamide increases EC levels by 1–3 µg/kg in both commercial and machine-baked bread.
Adding 100 mg/kg ascorbic acid with azodicarbonamide reduces EC increases compared to using ADA alone.
Toasting bread treated with ADA or urea leads to higher EC levels, possibly due to thermal reactions during heating.
Breads baked in a bread machine showed similar EC increases as commercial breads when ADA was added.
Urea addition enhances EC content in bread, suggesting it interacts with ADA during baking.
The researchers propose that EC increases depend on ADA concentration, fermentation time, and baking methods.