Disclosed are a pH-responsive amphoteric surfactant N-lauryl-(-alkyl)--aminopropionic acid and a preparation method and uses thereof. An alkylamine and a solvent are added to a three-necked flask, stirred for complete dissolution, slowly dropwise added with methyl -alkyl-acrylate and reacted at room temperature after the ice-water bath is removed. The reaction mixture is refluxed in water bath and evaporated under rotation to remove the solvent and the residual methyl -alkyl-acrylate to give N-lauryl-(-alkyl)--aminopropionic acid. Then N-lauryl-(-alkyl)--aminopropionic acid and water are added to a three-necked flask, slowly dropwise added with a sodium hydroxide solution and reacted in water bath to give a crude product, which is filtered and dried to give a purified surfactant sodium N-lauryl-(-alkyl)--aminopropionate. This surfactant is suitable for the foamed acid system and its performance can be switched by adjusting pH due to pH sensitivity.

Disclosed are a pH-responsive amphoteric surfactant N-lauryl-(-alkyl)--aminopropionic acid and a preparation method and uses thereof. An alkylamine and a solvent are added to a three-necked flask, stirred for complete dissolution, slowly dropwise added with methyl -alkyl-acrylate and reacted at room temperature after the ice-water bath is removed. The reaction mixture is refluxed in water bath and evaporated under rotation to remove the solvent and the residual methyl -alkyl-acrylateto give N-lauryl-(-alkyl)--aminopropionic acid. Then N-lauryl-(-alkyl)--aminopropionic acid and water are added to a three-necked flask, slowly dropwise added with a sodium hydroxide solution and reacted in water bath to give a crude product, which is filtered and dried to give a purified surfactant sodium N-lauryl-(-alkyl)--aminopropionate. This surfactant is suitable for the foamed acid system and its performance can be switched by adjusting pH due to pH sensitivity.

New surfactants with emulsifying, bio and eco-compatible properties, having long-chain aliphatic amides, obtained by a green method, deriving from amino acids, fatty acids and/or oils and/or butters, treated with microwave irradiation are provided.

New surfactants with emulsifying, bio and eco-compatible properties, having long-chain aliphatic amides, obtained by a green method, deriving from amino acids, fatty acids and/or oils and/or butters, treated with microwave irradiation are provided.

This is to provide a composition containing a decomposition product of yeast cell body residue useful as an emulsifier substitute, an emulsion stabilizer substitute or a milk-like substitute, and a method for producing the same, and use thereof.

Provided is a composition containing a cell wall lysing enzyme-decomposition product of yeast cell body residue, wherein the decomposition product contains 5% by mass or more of lipid based on a dry mass of the decomposition product.

This is to provide a composition containing a decomposition product of yeast cell body residue useful as an emulsifier substitute, an emulsion stabilizer substitute or a milk-like substitute, and a method for producing the same, and use thereof.

Provided is a composition containing a cell wall lysing enzyme-decomposition product of yeast cell body residue, wherein the decomposition product contains 5% by mass or more of lipid based on a dry mass of the decomposition product.

Use of a chelating agent in a surfactant composition to provide transparency and/or to substantially prevent discolouration, wherein the chelating agent comprises at least one aminopolycarboxylic acid or a salt thereof.

Use of a chelating agent in a surfactant composition to provide transparency and/or to substantially prevent discolouration, wherein the chelating agent comprises at least one aminopolycarboxylic acid or a salt thereof.

The present invention provides a method of producing an aqueous solution containing an NC.sub.8-22 acyl acidic amino acid and/or a salt thereof and having pH 8.4-9.5, including the first step for reacting an acidic amino acid and/or a salt thereof with a C.sub.8-22 fatty acid chloride in a water solvent at pH 10-13 to form an NC.sub.8-22 acyl acidic amino acid salt, and the second step for adjusting the pH of the aqueous solution after the first step to 8.4-9.5.

The present invention provides a method of producing an aqueous solution containing an NC.sub.8-22 acyl acidic amino acid and/or a salt thereof and having pH 8.4-9.5, including the first step for reacting an acidic amino acid and/or a salt thereof with a C.sub.8-22 fatty acid chloride in a water solvent at pH 10-13 to form an NC.sub.8-22 acyl acidic amino acid salt, and the second step for adjusting the pH of the aqueous solution after the first step to 8.4-9.5.