#$%^&*AU2020203745A120200625.pdf#####1003053550 ABSTRACT The present disclosure provides a method for extracting a soluble protein from a population of microorganisms, the method comprising contacting the population of microorganisms expressing the soluble protein with an amount of a solution comprising 5 from about 1% (v/v) to less than 50% (v/v) carboxylic acid effective to extract the soluble protein from the population of microorganisms.