Abstract: [Problem] To provide a novel antimicrobial agent that has excellent antimicrobial activity and which is prepared from an ester composed of propanediol and a ?-hydroxycarboxylic acid. [Solution] An antimicrobial agent which is prepared from a propanediol mono-?-hydroxycarboxylic acid ester expressed by the following formula (1) or formula (2) (wherein R1 and R2 are both branched or unbranched, and saturated or unsaturated alkyl groups having 5 to 9 carbon atoms).

Abstract: [Problem] To provide a novel antimicrobial agent that has excellent antimicrobial activity and which is prepared from an ester composed of propanediol and a ?-hydroxycarboxylic acid. [Solution] An antimicrobial agent which is prepared from a propanediol mono-?-hydroxycarboxylic acid ester expressed by the following formula (1) or formula (2) (wherein R1 and R2 are both branched or unbranched, and saturated or unsaturated alkyl groups having 5 to 9 carbon atoms).

Abstract: A novel antiseptic agent composition which has a wide antimicrobial spectrum and excellent antiseptic properties is provided. An antiseptic agent composition A contains a glycerin hydroxy fatty acid monoester that is an ester of glycerin and a hydroxy fatty acid having 8 to 18 carbon atoms, and a specific antiseptic agent such as an alkanediol. An antiseptic agent composition B contains the glycerin hydroxy fatty acid monoester and an aromatic antiseptic agent. An antiseptic agent composition C contains the glycerin hydroxy fatty acid monoester and a chelating agent.

Abstract: A novel antiseptic agent composition which has a wide antimicrobial spectrum and excellent antiseptic properties is provided. An antiseptic agent composition A contains a glycerin hydroxy fatty acid monoester that is an ester of glycerin and a hydroxy fatty acid having 8 to 18 carbon atoms, and a specific antiseptic agent such as an alkanediol. An antiseptic agent composition B contains the glycerin hydroxy fatty acid monoester and an aromatic antiseptic agent. An antiseptic agent composition C contains the glycerin hydroxy fatty acid monoester and a chelating agent.

Abstract: A novel antimicrobial agent which has a high degree of safety, an excellent compounding property and strong antimicrobial activity is provided. The antimicrobial agent is characterized by containing ricinoleic acid monoglyceride or diglycerine ricinoleic acid monoester as an active ingredient. The antimicrobial agent of the present invention is suitable as a compounding component of an antimicrobial object selected from a food product, a food packaging material, tableware, a perfume cosmetic, a cosmetic, an external preparation for skin, a skin washing agent, a disinfectant, a lotion for external use, an agent for hair, a wiping sterilization agent, a pharmaceutical, a quasi drug and a hygiene material for the oral cavity.