{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T03:09:10Z","timestamp":1784257750209,"version":"3.55.0"},"reference-count":45,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2025,6,12]],"date-time":"2025-06-12T00:00:00Z","timestamp":1749686400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Department of Science and Technology of Shandong Province of China","award":["2023TZXD074"],"award-info":[{"award-number":["2023TZXD074"]}]},{"name":"Department of Science and Technology of Shandong Province of China","award":["CXGC2025C19"],"award-info":[{"award-number":["CXGC2025C19"]}]},{"name":"Department of Science and Technology of Shandong Province of China","award":["2022DXAL0102"],"award-info":[{"award-number":["2022DXAL0102"]}]},{"name":"Shandong Academy of Agricultural Sciences of China","award":["2023TZXD074"],"award-info":[{"award-number":["2023TZXD074"]}]},{"name":"Shandong Academy of Agricultural Sciences of China","award":["CXGC2025C19"],"award-info":[{"award-number":["CXGC2025C19"]}]},{"name":"Shandong Academy of Agricultural Sciences of China","award":["2022DXAL0102"],"award-info":[{"award-number":["2022DXAL0102"]}]},{"name":"Shandong Science and Technology Commissioners of China","award":["2023TZXD074"],"award-info":[{"award-number":["2023TZXD074"]}]},{"name":"Shandong Science and Technology Commissioners of China","award":["CXGC2025C19"],"award-info":[{"award-number":["CXGC2025C19"]}]},{"name":"Shandong Science and Technology Commissioners of China","award":["2022DXAL0102"],"award-info":[{"award-number":["2022DXAL0102"]}]},{"name":"Muping Bureau of Science and Technology of China","award":["2023TZXD074"],"award-info":[{"award-number":["2023TZXD074"]}]},{"name":"Muping Bureau of Science and Technology of China","award":["CXGC2025C19"],"award-info":[{"award-number":["CXGC2025C19"]}]},{"name":"Muping Bureau of Science and Technology of China","award":["2022DXAL0102"],"award-info":[{"award-number":["2022DXAL0102"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Chitosan, a naturally occurring alkaline polysaccharide with excellent biocompatibility, non-toxicity, and renewability, has the ability to undergo cross-linking reactions with polyphenolic compounds. In this study, chitosan-encapsulated green tea extract microsphere resin (CS-GTEMR) was successfully prepared using chitosan and green tea extract via reversed-phase suspension cross-linking polymerization. The structural characterization of CS-GTEMR was conducted using Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC). Additionally, its physical properties, swelling behavior, polyphenol content, and antioxidant activities were investigated. The results indicate that CS-GTEMR consists of reddish-brown microspheres with a smooth surface and dense pores. The study found that the total content of polyphenolic compounds encapsulated in CS-GTEMR was 50.485 \u00b1 0.840 \u03bcg\/g. The characteristic absorption peak of phenolic hydroxyl groups appeared in the FTIR spectrum, suggesting that the polyphenolic compounds had been successfully encapsulated within the CS-GTEMR. The equilibrium swelling ratio of CS-GTEMR was determined to be 229.7%, indicating their suitability for use in solutions with a pH range of 1\u201313. In simulated gastric and intestinal fluids, the release rates of polyphenolic compounds from CS-GTEMR were 24.934% and 3.375%, respectively, indicating that CS-GTEMR can exert a sustained-release effect on polyphenolic compounds. CS-GTEMR demonstrated antioxidant activities such as scavenging DPPH radicals, superoxide anion radicals, hydroxyl radicals, and hydrogen peroxide, as well as exhibiting iron-reducing and molybdenum-reducing powers. With its high mechanical strength, acid resistance, and organic solvent resistance, CS-GTEMR can protect polyphenolic compounds from damage. Therefore, CS-GTEMR can be utilized as a natural antioxidant or preventive agent in food, expanding the application scope of green tea extracts.<\/jats:p>","DOI":"10.3390\/polym17121633","type":"journal-article","created":{"date-parts":[[2025,6,12]],"date-time":"2025-06-12T07:44:23Z","timestamp":1749714263000},"page":"1633","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Exploring the Characterization, Physicochemical Properties, and Antioxidant Activities of Chitosan-Encapsulated Green Tea Extract Microsphere Resin"],"prefix":"10.3390","volume":"17","author":[{"given":"Lina","family":"Yu","sequence":"first","affiliation":[{"name":"Shandong Peanut Research Institute, Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyu","family":"Feng","sequence":"additional","affiliation":[{"name":"College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Song","sequence":"additional","affiliation":[{"name":"Shandong Peanut Research Institute, Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Bi","sequence":"additional","affiliation":[{"name":"Shandong Peanut Research Institute, Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2057-3397","authenticated-orcid":false,"given":"Yuan","family":"Gao","sequence":"additional","affiliation":[{"name":"Shandong Peanut Research Institute, Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luhui","family":"Wang","sequence":"additional","affiliation":[{"name":"Shandong Peanut Research Institute, Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Jiang","sequence":"additional","affiliation":[{"name":"Shandong Peanut Research Institute, Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingqing","family":"Wang","sequence":"additional","affiliation":[{"name":"Shandong Peanut Research Institute, Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"142827","DOI":"10.1016\/j.foodchem.2025.142827","article-title":"Green technologies applied to extraction processes and analysis of polyphenolic compounds from Inga laurina Willd","volume":"471","author":"Righi","year":"2025","journal-title":"Food Chem."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1549","DOI":"10.1080\/10942912.2022.2064491","article-title":"Nutritional composition, polyphenolic compounds and biological activities of marula fruit (Sclerocarya birrea) with its potential food applications: A review","volume":"25","author":"Mashau","year":"2022","journal-title":"Int. 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