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Coacervate materials have shown significant potential for the formulation of proteins and viruses with improved thermal stability. We leveraged a combination of experiments and simulations to investigate how the presence of both proteins and small-molecule excipients common in stabilizing formulations would affect the partitioning of both protein and excipient in the coacervate phase. Although electrostatic interactions tend to dominate the incorporation of proteins into coacervates, our study highlights the balance of protein-water-excipient interactions as a critical parameter for understanding partitioning trends in these multi-component formulations. This work provides insight into the design of multi-component formulations that take advantage of complex coacervation and could serve as a basis for product design in the future.<\/jats:p>","DOI":"10.1021\/acs.biomac.6c01389","type":"journal-article","created":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T17:02:10Z","timestamp":1790355730000},"page":"6802-6813","source":"Crossref","is-referenced-by-count":0,"title":["Exploring the Mutual Effects of Excipients and Proteins in Complex Coacervation"],"prefix":"10.1021","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-3475-071X","authenticated-orcid":true,"given":"Xianci","family":"Zeng","sequence":"first","affiliation":[{"name":"University of Massachusetts Amherst , , , ,","place":["Amherst, Massachusetts, United States, 01003"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2091-0189","authenticated-orcid":true,"given":"Arvind","family":"Sathyavageeswaran","sequence":"additional","affiliation":[{"name":"University of Massachusetts Amherst , , , ,","place":["Amherst, Massachusetts, United States, 01003"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2025-7896","authenticated-orcid":true,"given":"Jonathan W. 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