The present disclosure provides a method for preparing biopolymer particles, said method comprising a membrane emulsification of a dispersed phase into a continuous phase wherein the dispersed phase comprises the biopolymer in a solvent, and wherein passing the dispersed phase through the membrane forms an emulsion of the biopolymer in the continuous phase; and a phase inversion with an anti-solvent to form particles of the biopolymer; wherein prior to (b), the emulsion is cooled to a temperature, T1. Also provided are biopolymer particles obtained from the method.

A method for producing a resin particle dispersion includes: obtaining a phase-inverted emulsion by adding a neutralizer to a resin solution prepared by dissolving a resin having an acid value in an organic solvent to thereby neutralize the resin and then adding an aqueous medium to the resulting resin solution to subject the resin to phase inversion emulsification; and removing the organic solvent from the phase-inverted emulsion. In the course of obtaining the phase-inverted emulsion, a maximum agitation power per unit mass (kg) of the resin when the resin solution containing the aqueous medium added thereto is agitated to perform the phase inversion emulsification is from 0.4 W to 20 W inclusive.

A stable emulsion composition (100) and method of manufacturing. The method of manufacturing can include the steps of hydrating quillaja (104), cooling the quillaja (104) to a temperature of greater than approximately 68 degrees Fahrenheit and less than approximately 72 degrees Fahrenheit, combining the quillaja (104) with an oil (106) phase mixture, adding the water-in-oil emulsion (110) to an additional volume of water (102), adding stabilizers (107) and polysaccharides that interact with emulsifiers in the water-in-oil emulsion (110) to generate a film at an oil-water interface of the water-in-oil emulsion (110), and using a high shear homogenizer to apply a shear force to the water-in-oil emulsion (110) and the additional volume of water (102), the step of using the high shear homogenizer to apply the shear force to the water-in-oil emulsion (110) and the additional volume of water (102) including a catastrophic phase inversion, the high shear homogenizer having a shear rate of at least approximately 1000 s.sup.1.