“…71,72 The solubility of Eudragit®S100 is pH-dependent: it is insoluble in strongly acidic solutions, while it is slightly soluble in the region of the digestive tract with neutral to weakly alkaline pH. 73,74 Multi-walled microcapsules based on Eudragit S100 nanoparticles, alginate, and chitosan have been developed for improving the viability of the probiotic bacteria Lactobacillus acidophilus and Lactobacillus rhamnosus in simulated gastrointestinal conditions. 75 In essence, the negatively charged Eudragit S100 nanoparticles attract positively charged chitosan in the rst coating layer with ionic bonds to form the second layer.…”