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In this study, a mineral-rich powder obtained from the solid components of Ucides cordatus crab shells was processed (washing, drying, milling, and sieving at 75 \u00b5m) and extensively characterized using SEM, FTIR XRD, EDX, mineral analysis, hygroscopicity, density, and particle size distribution. The powder exhibited heterogeneous morphology and contained 22.52 g\u00b7kg\u22121 of calcium carbonate, along with other trace minerals; its crystalline profile indicated the presence of both calcite and aragonite. Low hygroscopicity (1.76%) and a true density of 2.11 g\/cm3 were also observed. When incorporated into pectin-based films at 1\u20135%, the filler promoted a reduction in film thickness, indicating enhanced structural compaction. Solubility increased linearly with filler content, whereas water vapor permeability (WVP) decreased at 1% and 2% but rose again at 4% and 5%, correlating positively with solubility (r = 0.895). Films containing 4% and 5% exhibited higher tensile strength and elastic modulus, confirming increased rigidity. At elevated concentrations, the films also became less luminous and more chromatic. Overall, the findings demonstrate that crab-shell mineral powder is a viable and sustainable reinforcement capable of tailoring the structural, mechanical, and barrier performance of biodegradable films.<\/jats:p>","DOI":"10.3390\/polym17243334","type":"journal-article","created":{"date-parts":[[2025,12,17]],"date-time":"2025-12-17T15:53:46Z","timestamp":1765986826000},"page":"3334","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Residual Utilization of Crab Solid Parts for Powder Production and Application as a Structural Component in the Polymeric Matrix of Biodegradable Films"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-7552-3147","authenticated-orcid":false,"given":"F\u00e1bio G.","family":"Teles","sequence":"first","affiliation":[{"name":"Department of Food Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Para\u00edba, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5845-6391","authenticated-orcid":false,"given":"Railene H. C. R.","family":"Ara\u00fajo","sequence":"additional","affiliation":[{"name":"Department of Food Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Para\u00edba, Brazil"}]},{"given":"Aline D. B.","family":"Arriel","sequence":"additional","affiliation":[{"name":"Department of Food Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Para\u00edba, Brazil"}]},{"given":"Valdilene M. C.","family":"Soares","sequence":"additional","affiliation":[{"name":"Department of Food Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Para\u00edba, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8785-5487","authenticated-orcid":false,"given":"Adriano S.","family":"Silva","sequence":"additional","affiliation":[{"name":"Department of Food Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Para\u00edba, Brazil"}]},{"given":"Kalinny A.","family":"Alves","sequence":"additional","affiliation":[{"name":"Department of Process Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Para\u00edba, Brazil"}]},{"given":"Maria A. S.","family":"Morais","sequence":"additional","affiliation":[{"name":"Department of Agronomic and Forest Sciences, Federal Rural University of the Semi-Arid Region, Mossor\u00f3 59625-900, Rio Grande do Norte, Brazil"}]},{"given":"Patr\u00edcia L. D.","family":"Morais","sequence":"additional","affiliation":[{"name":"Department of Agronomic and Forest Sciences, Federal Rural University of the Semi-Arid Region, Mossor\u00f3 59625-900, Rio Grande do Norte, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-3434-6183","authenticated-orcid":false,"given":"Nayara S.","family":"Rocha","sequence":"additional","affiliation":[{"name":"Department of Food Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Para\u00edba, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1691-1872","authenticated-orcid":false,"given":"Antonio G. B.","family":"Lima","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Para\u00edba, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1026-4523","authenticated-orcid":false,"given":"Jo\u00e3o M. P. 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