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However, the formidable challenge is to develop bioadhesives that exhibit high injectability, rapidly adhere to lesion tissues with fast gelation, provide reliable protection in the harsh gastric environment, and simultaneously ensure stringent standards of biocompatibility. Here, a natural bioadhesive with tunable cohesion is developed based on the facile and controllable gelation between silk fibroin and tannic acid. By incorporating a hydrogen bond disruptor (urea or guanidine hydrochloride), the inherent network within the bioadhesive is disturbed, inducing a transition to a fluidic state for smooth injection (injection force &lt;5\u00a0N). Upon injection, the fluidic bioadhesive thoroughly wets tissues, while the rapid diffusion of the disruptor triggers instantaneous in situ gelation. This orchestrated process fosters the formed bioadhesive with durable wet tissue affinity and mechanical properties that harmonize with gastric tissues, thereby bestowing long\u2010lasting protection for ulcer healing, as evidenced through in vitro and in vivo verification. Moreover, it can be conveniently stored (\u22653\u00a0m) postdehydration. This work presents a promising strategy for designing highly injectable bioadhesives utilizing natural feedstocks, avoiding any safety risks associated with synthetic materials or nonphysiological gelation conditions, and offering the potential for minimally invasive application.<\/jats:p>","DOI":"10.1002\/smll.202307628","type":"journal-article","created":{"date-parts":[[2024,1,8]],"date-time":"2024-01-08T22:01:40Z","timestamp":1704751300000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Natural Underwater Bioadhesive Offering Cohesion Modulation via Hydrogen Bond Disruptor: A Highly Injectable and in Vivo Stable Remedy for Gastric Ulcer Resolution"],"prefix":"10.1002","volume":"20","author":[{"given":"Hao","family":"Wang","sequence":"first","affiliation":[{"name":"College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University  Chengdu 610065 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiang","family":"Ke","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University  Chengdu 610065 P. R. China"},{"name":"Chemistry and Chemical Engineering Guizhou University  Guiyang 550025 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuxian","family":"Tang","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University  Chengdu 610065 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kai","family":"Ren","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University  Chengdu 610065 P. R. 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