E501

E501 is the food additive code for Potassium Carbonates, a group of alkaline potassium salts used mainly as raising agents, acidity regulators, and processing aids in food.
E501 includes E501(i) Potassium Carbonate and E501(ii) Potassium Hydrogen Carbonate, and E501 is widely used in bakery and confectionery to release carbon dioxide and improve texture.
E501 is valued for reliable leavening performance and buffering capacity, and E501 can be used to reduce sodium content compared with sodium carbonate systems in certain formulations.

CAS Number: 584-08-7 (Potassium Carbonate) / 298-14-6 (Potassium Hydrogen Carbonate)
EC Number: 209-529-3 (Potassium Carbonate) / 206-059-0 (Potassium Hydrogen Carbonate)
Molecular Formula: K2CO3 (Potassium Carbonate) / KHCO3 (Potassium Hydrogen Carbonate)
Molecular Weight: 138.21 g/mol (K2CO3) / 100.12 g/mol (KHCO3)

Synonyms: E501, Potassium Carbonates, E501(i) Potassium Carbonate, E501(ii) Potassium Bicarbonate, Potassium Hydrogen Carbonate, Potash (common term), Potassium Carbonate Food Grade, Potassium Bicarbonate Food Grade, Leavening Agent E501, Buffer E501, Acidity Regulator E501, Raising Agent E501, E501, E 501, E-501, INS 501, INS-501, E501 (Food Additive), E501 (Acidity Regulator), E501 (Raising Agent), E501 (Leavening Agent), Potassium Carbonates, Potassium carbonates, Potassium Carbonate (food additive group), Potassium Carbonates (E501), E501 (Potassium Carbonates), Potassium Carbonate, Potassium carbonate, Pearl Ash, Pearl ash, Potash, Potash (food grade potassium carbonate), Salt of Tartar (historical name), K2CO3, K2CO₃ (format variant), Potassium Carbonate (E501i), E501(i), E501i, E501i (Potassium Carbonate), Potassium Carbonate Anhydrous, Anhydrous Potassium Carbonate, Potassium Carbonate (light), Potassium Carbonate (dense), Potassium Bicarbonate, Potassium bicarbonate, Potassium Hydrogen Carbonate, Potassium Hydrogencarbonate (spelling variant), KHCO3, KHCO₃ (format variant), Potassium Bicarbonate (E501ii), E501(ii), E501ii, E501ii (Potassium Bicarbonate), Potassium Hydrogen Carbonate (E501ii), Potassium Carbonate (acidity regulator), Potassium Bicarbonate (acidity regulator), Potassium Carbonate (raising agent), Potassium Bicarbonate (raising agent)

APPLICATIONS

E501 is used in baked goods as a leavening agent to release carbon dioxide and increase volume.
E501 is incorporated into cookies and biscuits to improve spread and create crisp texture profiles.
E501 is used in cakes and muffins to support rise and improve crumb softness in compatible formulations.

E501 is used in crackers to provide controlled expansion and a lighter bite.
E501 is incorporated into flatbreads to improve aeration and texture.
E501 is used in pancake and waffle mixes to provide reliable rise when combined with acids.

E501 is used in baking powders, often together with acid salts, to create balanced and controlled leavening.
E501 is incorporated into self-raising flour to support convenient baking performance.
E501 is used in bakery premixes to standardize rise and reduce batch variability.

E501 is used in confectionery to control pH and influence texture in caramel and chewy sweets.
E501 is incorporated into cocoa and chocolate-based products to adjust alkalinity and influence color and flavor development in selected systems.
E501 is used in syrup processing to help manage acidity and processing stability.

E501 is used in effervescent tablets and powders to generate carbon dioxide with acid components.
E501 is incorporated into sparkling confectionery and popping effects where controlled CO2 release is part of the sensory profile.
E501 is used in beverage systems as a buffering agent to control acidity in compatible formulations.

E501 is used in specialty bakery products to reduce sodium compared with sodium carbonate systems while maintaining leavening performance.
E501 is incorporated into low-sodium formulations to support label goals and nutritional positioning.
E501 is used in salt-reduced bakery mixes where potassium salts are acceptable for taste and regulatory requirements.

E501 is used in processing aids where alkalinity and buffering support manufacturing performance, including some cleaning and neutralizing steps in food operations when food-grade materials are required.
E501 is incorporated into process water adjustment where pH control is needed in compatible systems.
E501 is used in selected food processes to support pH stabilization and consistent product quality.

E501 is used in meat and seafood processing as an acidity regulator to improve water binding and texture in compatible formulations.
E501 is incorporated into marinades and brines to adjust pH and improve processing behavior.
E501 is used in restructured products where controlled alkalinity supports functional proteins and texture.

E501 is used in snack seasoning and coating systems to influence flavor release and browning reactions in heated processes.
E501 is incorporated into spice blends where slight alkalinity helps achieve specific taste profiles.
E501 is valued because E501 provides reliable leavening and buffering performance with an option to reduce sodium content in certain product designs.

E501 is used as Potassium Carbonates as an acidity regulator in food processing.
E501 helps adjust pH in cocoa products and chocolate processing for flavor and color control.
E501 supports consistent alkalization performance in controlled food manufacturing.

E501 is used in cocoa alkalization to produce Dutch-processed cocoa.
E501 helps darken cocoa color and reduce perceived acidity.
E501 supports improved dispersibility of cocoa powders in beverages.

E501 is used in baking to regulate acidity and support leavening systems.
E501 helps react with acidulants to release carbon dioxide in certain baking applications.
E501 supports texture and structure development in baked goods when properly balanced.

E501 is used in gingerbread and spiced bakery products to influence flavor and browning.
E501 supports characteristic color development through pH shift.
E501 helps achieve traditional taste profiles in some recipes.

E501 is used in confectionery processing to control pH of sugar solutions in specific steps.
E501 supports pH adjustment that influences caramelization and Maillard reactions.
E501 helps tune flavor development and color formation in heated sugar systems.

E501 is used in production of certain candies where pH control affects texture and stability.
E501 supports improved stability of confectionery syrups under processing stress.
E501 helps reduce undesirable crystallization in some sugar systems by pH management.

E501 is used in beverage powders and instant drink mixes as a buffering agent.
E501 supports controlled acidity and improved flavor stability in dry beverage blends.
E501 helps maintain consistent mixing behavior and product taste.

E501 is used in effervescent products when combined with acids to generate CO2.
E501 supports effervescent tablets and drink powders as a carbon dioxide source.
E501 helps create a controlled fizz profile in water when formulated correctly.

E501 is used in wine and beverage processing as a deacidification agent in some contexts.
E501 supports neutralization of excess acid in must or juice under controlled dosing.
E501 helps adjust taste balance when high acidity is present.

E501 is used in specialty food processing as a potassium source when potassium labeling is desired.
E501 supports potassium fortification in certain low-sodium concepts.
E501 helps replace sodium-based alkalizers in some formulations.

E501 is used as a buffering agent in processed foods to maintain stable pH.
E501 supports consistent microbial stability by controlling acidity conditions.
E501 helps maintain product quality during storage and distribution.

E501 is used in noodle and pasta processing to improve texture in certain alkaline noodle systems.
E501 supports firm bite and springy texture when alkalinity is controlled.
E501 helps maintain consistent dough behavior in alkaline noodle manufacturing.

DESCRIPTION

E501 is the food additive designation for Potassium Carbonates, including potassium carbonate and potassium bicarbonate depending on labeling context.
E501 is typically supplied as a white, odorless crystalline powder or granules.
E501 is strongly alkaline in water and provides carbonate buffering capacity.

E501 dissolves in water to form alkaline solutions that raise pH.
E501 reacts with acids to release carbon dioxide, which supports leavening and effervescence in formulations.
E501 can absorb moisture from air and may cake if not stored properly.

E501 is used widely in food processing for alkalization and acidity regulation, especially in cocoa processing.
E501 can influence browning reactions by shifting pH and therefore affects color and flavor development.
E501 is used where potassium-based alkalinity is preferred over sodium-based alternatives.

E501 refers to potassium carbonate and potassium hydrogen carbonate used as food additives, and E501 is used for leavening, acidity regulation, and buffering.
E501 releases carbon dioxide when heated or when reacting with acids, and this gas generation creates expansion and lighter texture in baked goods and effervescent products.
E501 raises pH and provides buffering, so E501 must be balanced with acidic ingredients to avoid alkaline taste and undesired browning effects.

E501(i) Potassium Carbonate is more strongly alkaline and is used in specialized applications where stronger pH adjustment is needed.
E501(ii) Potassium Hydrogen Carbonate is milder and is widely used in baking, effervescence, and acidity regulation.
E501 performance depends on particle size, moisture content, recipe acidity, and processing temperature, so formulation optimization is recommended.

E501 is hygroscopic, especially potassium carbonate, so E501 should be stored tightly sealed to prevent moisture uptake and caking.
E501 should be kept away from acids and acidic vapors during storage to prevent premature CO2 release in bicarbonate-containing products.
E501 should be used according to applicable food additive regulations and good manufacturing practices for the target market.

PROPERTIES

Common Name: E501 (Potassium Carbonates)
Components: E501(i) Potassium Carbonate (K2CO3) and E501(ii) Potassium Hydrogen Carbonate (KHCO3)
Appearance: White crystalline powder or granules
Odor: Odorless
Solubility: Soluble in water
pH: Alkaline in aqueous solution (stronger for potassium carbonate than potassium bicarbonate)
Function: Raising agent, acidity regulator, buffer, processing aid
Gas Release: Releases CO2 with heat and/or acids (key for leavening and effervescence)
Thermal Behavior: Potassium bicarbonate decomposes on heating to release CO2; potassium carbonate is more thermally stable
Hygroscopicity: Potassium carbonate is strongly hygroscopic; caking possible in humid environments
Stability: Stable under dry storage; loses effectiveness if exposed to moisture and acids
Storage Temperature: 15–25°C, dry, tightly closed
Shelf Life: Typically 24–48 months in original sealed packaging (supplier dependent)

FIRST AID

Inhalation:
Move to fresh air if dust is inhaled.
Seek medical attention if respiratory irritation persists.
Avoid breathing dust during handling and powder transfer.

Skin Contact:
Wash with soap and water after contact.
Seek medical advice if irritation develops or persists, especially with repeated exposure.
Remove contaminated clothing and wash before reuse.

Eye Contact:
Rinse cautiously with water for several minutes.
Remove contact lenses if present and easy to do, then continue rinsing.
Seek medical attention if irritation persists.

Ingestion:
Rinse mouth with water.
Seek medical attention if discomfort occurs or if a large amount is swallowed.
Never give anything by mouth to an unconscious person.

Note to Physicians:
Treat symptomatically.
Consider gastrointestinal irritation and alkalinity effects in significant ingestion.
Provide supportive care based on exposure route and symptoms.

HANDLING AND STORAGE

Handling:
Use appropriate PPE including gloves and safety glasses, and use dust protection as needed.
Avoid generating dust and avoid inhalation of fine powder.
Wash hands after handling and before eating, drinking, or smoking.

Ventilation:
Use local exhaust or general ventilation where dust may be generated.
Maintain good airflow during weighing, charging, and blending operations.
Minimize airborne particulate accumulation in enclosed areas.

Storage:
Store in tightly closed containers in a cool, dry place.
Protect from moisture to prevent caking and loss of reactivity.
Keep away from acids and acidic vapors to prevent premature CO2 release.

Spill and Leak Procedures:
Avoid dust generation and sweep or vacuum using suitable equipment.
Collect spilled material into suitable containers for disposal according to local regulations.
Clean residues with water if needed while preventing slippery surfaces.

Handling Precautions:
Balance E501 with acidic ingredients in formulations to prevent alkaline taste and achieve controlled leavening.
Use appropriate granulation and mixing to ensure uniform distribution in dry mixes.
Rotate stock using FIFO practices to maintain consistent performance and reactivity.