Provided herein is a process for preparing a solid particle comprising: preparing an emulsion comprising: from 0.01 to 0.24%, by weight, of the final weight of the solid particle, of a saponin； from 5 to 55%, by weight, of the total weight of the emulsion, a water soluble biopolymer having a molecular weight below 100 KDa； from 5 to 60%, by weight, of the final weight of the solid particle, a flavor or fragrance comprising from about 50% to about 95% of limonene； from about 5% to about 50%, by weight, of the final weight of the solid particle an alcohol； and from about 15% up to about 80 % of water； the percentages being defined by weight； 1. spray-drying the emulsion obtained in step 1) so as to obtain solid capsules； 2. the solid capsule in which the droplet size measured by Diffusion Light Scattering is characterized by a characteristic diameter D90 (90% of the population) equal or below 14 micrometers； 3. and in which the alcohol is aliphatic saturated or unsaturated (from C6 to C12) pure or in mixture with logP ranging from 1.8 to 4.8 as calculated by the Suzuki method； or cyclic (i.e. phenol, vanillin...)； in the flavor or fragrance that will be used as a co-surfactant in conjunction with the natural extract comprising saponins when the concentration of the solid extract of saponin is equal or lower than 0.06%w/w to guaranty a droplet size below the limit according to 3) even under reduced quantity of surfactant. e) An α value as calculated by the model that is between 2,500 and 10,250 cm2/g.L'invention concerne un procédé de préparation d'une particule solide comprenant : la préparation d'une émulsion comprenant : de 0,01 à 0,24 %, en poids, par rapport au poids final de la particule solide, d'une saponine ； de 5 à 55 %, en poids, par rapport au poids total de l'émulsion, d'un biopolymère soluble dans l'eau d'un poids moléculaire inférieur à 100 KDa ； de 5 à 60 %, en poids, par rapport au poids final de la particule solide, d'un arôme ou d'un parfum comprenan
