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Methylparaben is readily absorbed from the gastrointestinal tract or through the skin. [8] It is hydrolyzed to p-hydroxybenzoic acid and rapidly excreted in urine without accumulating in the body. [8] Acute toxicity studies have shown that methylparaben is practically non-toxic by both oral and parenteral administration in animals. [8]
The Arrhenius equation was used in a study to calculate activation energies for the chlorination of four parent parabens (methyl-, ethyl-, propyl-, and butylparaben) and was found to range from 36–47 kJ/mol. [21] In another study, tap water at 20 °C (68 °F) containing 50–200 μM free chlorine was spiked with 0.5 μM propylparaben and the ...
The following is a list of chemicals published as a requirement of Safe Drinking Water and Toxic Enforcement Act of 1986, commonly known as California Proposition 65, that are "known to the state to cause cancer or reproductive toxicity" as of January 3, 2020. [1]
Long-chained parabens, like butylparaben, are more estrogenic than short-chained parabens, like methyl- or ethylparaben. This difference is attributed to the greater lipophilicity of the former. [13] Butylparaben displayed the most competitive binding to rat estrogen receptors when tested along with methyl, ethyl, and propylparabens. [16]
4-Hydroxybenzoic acid, also known as p-hydroxybenzoic acid (PHBA), is a monohydroxybenzoic acid, a phenolic derivative of benzoic acid.It is a white crystalline solid that is slightly soluble in water and chloroform but more soluble in polar organic solvents such as alcohols and acetone. 4-Hydroxybenzoic acid is primarily known as the basis for the preparation of its esters, known as parabens ...
The crude chloroform and methanol extracts of the stem bark of the plant show strong feeding deterrent activity against stored-product insect pest of maize Tribolium castaneum with the two compounds, methyl paraben and lupeol, being identified in these extracts. [citation needed]
Ye has no regrets about his and his wife's controversial Grammys stunt.. In an X post on Thursday, the rapper formerly known as Kanye West addressed backlash after his wife, Bianca Censori, walked ...
A sack of "pink grain". Note the labelling in Spanish, and the grain's distinctive orange-pink colour. The 1971 Iraq poison grain disaster was a mass methylmercury poisoning incident that took place in late 1971 where seed grain treated with a methylmercury fungicide, which was never intended for human consumption, was imported into Iraq from Mexico and the United States.