Padimate A
Padimate A is a type of organic compound that is commonly used in sunscreen products due to its ability to absorb ultraviolet (UV) light. It is a derivative of the compound PABA (para-aminobenzoic acid), which was one of the first compounds used in sunscreen products. However, due to concerns about the safety of PABA, many sunscreen products now use Padimate A instead.
Chemical Structure and Properties
Padimate A is an ester of PABA, meaning it is formed by a reaction between PABA and another compound. In the case of Padimate A, this other compound is 2-ethylhexanol. The resulting ester has a chemical formula of C17H27NO3 and a molecular weight of 293.4 g/mol.
The compound is a yellowish, oily liquid at room temperature. It is soluble in alcohol and other organic solvents, but not in water. This makes it ideal for use in oil-based sunscreen products.
Use in Sunscreen
The primary use of Padimate A is in sunscreen products, where it acts as a UV filter. It is capable of absorbing UV light in the range of 290 to 320 nm, which corresponds to the UVB range. This is the range of UV light that is most responsible for causing sunburn and other forms of skin damage.
When applied to the skin, Padimate A absorbs the UV light and converts it into heat, which is then dissipated harmlessly. This prevents the UV light from penetrating the skin and causing damage.
Safety and Health Concerns
While Padimate A is generally considered safe for use in sunscreen products, there have been some concerns raised about its potential health effects. Some studies have suggested that it may have estrogenic effects, meaning it could potentially interfere with the body's hormone system. However, these effects have not been conclusively proven, and the compound is still widely used in sunscreen products.
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Contributors: Prab R. Tumpati, MD
