Methyl 4-hydroxybenzoate, also known as methylparaben or methylparaben, white crystalline powder or colorless crystal, soluble in alcohol, ether and acetone, very sparingly soluble in water, boiling point 270-280 °C. It is mainly used as a bactericidal preservative for organic synthesis, food, cosmetics and medicine, and also as a preservative for feed. Because of its phenolic hydroxyl structure, its antibacterial properties are stronger than benzoic acid and sorbic acid. Its mechanism of action is: destroying the cell membrane of the microorganism, denaturation of the protein in the cell, and inhibiting the activity of the respiratory enzyme system and the electron transport enzyme system of the microbial cell.
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