BHA stands for Butylated Hydroxyanisole whereas BHT stands for Butylated Hydroxytoluene.
The molecular formula of BHA is C6H11O2 whereas the molecular formula of BHA is C15H24O2.
BHA is white or yellowish waxy solid whereas BHT is white powder.
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Key Differences between BHA and BHT

- BHA (Butylated Hydroxyanisole) and BHT (Butylated Hydroxytoluene) are synthetic antioxidants commonly used in food and cosmetic products to prevent oxidation and extend shelf life.
- Despite their similar names and functions, there are some key differences between BHA and BHT that are important to understand.

Chemical Structure

- BHA: BHA is derived from anisole and consists of a mixture of two isomers, 3-tert-butyl-4-hydroxyanisole and 2-tert-butyl-4-hydroxyanisole.
- BHT: BHT is derived from toluene and is composed of a single isomer, 2,6-di-tert-butyl-4-methylphenol.

Function

- Both BHA and BHT function as antioxidants by preventing the oxidation of fats and oils in food and cosmetic products.
- They help maintain the quality and freshness of products by inhibiting the formation of harmful free radicals.

Usage

- BHA is commonly used in food products such as snack foods, cereals, and chewing gum, as well as in cosmetic products.
- BHT is also used in a wide range of food products, including baked goods, meats, and snack foods, as well as in cosmetics and pharmaceuticals.

Regulation

- Both BHA and BHT have been approved by regulatory authorities such as the FDA for use in food and cosmetic products within specified limits.
- However, there have been some concerns about the potential health risks associated with long-term exposure to these synthetic antioxidants.

In conclusion, while BHA and BHT serve similar functions as antioxidants in food and cosmetic products, they differ in their chemical structures, usage, and regulatory status. It is important for consumers to be aware of these differences and make informed choices about the products they consume.