Propylparaben
- P- hydroxybenzoate
- PHB - propyl
- Propylparaben
- Propyl 4-hydroxybenzoate (IUPAC)
- Propyl parahydroxybenzoate
- E 216 (as Na salt: E 217 ) (until 2006)
Colorless, almost odorless, crystalline powder
Fixed
1.063 g · cm -3 ( at 102 ° C)
95-98 ° C
Decomposition at 180 ° C
Slightly soluble in water (5 g · l-1 at 25 ° C)
Attention
6332 mg · kg -1 ( LD50, mouse, oral)
Template: Infobox chemical / molecular formula search available
4- hydroxybenzoate, p- hydroxybenzoate outdated (PHB - propyl ), the propyl esters of aromatic carboxylic acid 4 -hydroxybenzoic acid and is one of the parabens.
Properties
4- hydroxybenzoate is a colorless, odorless, crystalline substance having a slightly burning taste and acts weak anesthetic. It dissolves little in water (5 g / l at 25 ° C), but well in organic solvents such as acetone, chloroform, ethanol and ether. In alkaline solutions, the phenolate ( sodium propyl p -hydroxybenzoate ) forms.
Use
4- hydroxybenzoate was found as a preservative, for example, in shampoos, shower gels and other cosmetics.
4- hydroxybenzoate was approved as a food additive under the E number 216 in the EU by 2006. Due to better solubility of the sodium salt of mostly ( Natriummpropyl p-hydroxybenzoate, E 217 ) was used. After a feminizing effect of E216 was found under the EU said in 2006 further use.