Uncontrolled hemorrhage remains the deadliest consequence of combat wounds. South Korean researchers have now engineered a powder that hardens into a gel within seconds of contact with blood, potentially saving lives on the battlefield and in emergency rooms worldwide.
The innovation emerged from collaboration between materials scientists at KAIST and an Army Major embedded in the research team. The combination ensured the technology was built for real-world combat conditions rather than laboratory ideals. The resulting powder maintains stability in extreme storage environments, deploys instantly even under field pressure, and performs without the fragility of existing alternatives.
Traditional hemostatic patches dominate current practice, but their flat design fails in deep or irregularly shaped wounds. Temperature and humidity sensitivity further limits their use in challenging deployment scenarios. The KAIST team solved this by creating a powder that conforms to any wound geometry, transforming a single product into a universal applicator for injuries ranging from small punctures to large, complex trauma.
How AGCL powder works
The material, dubbed AGCL powder, combines three biocompatible, naturally derived ingredients. Alginate and Gellan Gum react with calcium ions in blood to trigger immediate gel formation. Chitosan adds a second mechanism by bonding directly with blood components to enhance clotting at both chemical and biological levels. When sprayed onto a wound, the powder contacts blood and transforms into a protective gel in roughly one second.
The internal structure of the gel absorbs over seven times its weight in blood, allowing it to seal heavy bleeding quickly and forcefully. Laboratory testing confirmed adhesive strength exceeding 40 kilopascals, enough to resist firm hand pressure. Comparisons against commercially available products showed AGCL outperformed existing hemostatic agents across multiple metrics.
Safety testing revealed a hemolysis rate below 3%, cell viability above 99%, and a 99.9% antibacterial effect. Animal studies demonstrated accelerated wound healing with improved regeneration of both blood vessels and collagen. In surgical liver injury models, the powder reduced blood loss and stoppage time compared to commercial alternatives. Liver function normalized within two weeks, with no evidence of systemic toxicity.
Another critical advantage is longevity. The powder maintained full performance for two years under room temperature and high humidity, eliminating the frequent restocking demands that plague current products in military and disaster settings.
The research team, led by Professor Steve Park of the Department of Materials Science and Engineering and Professor Sangyong Jon of the Department of Biological Sciences, included Ph.D. student Kyusoon Park, an Army Major whose military perspective shaped the project from conception. Park stated that modern warfare hinges on minimizing human loss and that he undertook the research with the mission to save additional soldiers. He expressed hope the technology would serve both national defense and civilian medicine.
The military origins do not limit the powder's potential. Researchers see applications in disaster response, rural healthcare, and underserved regions. The powder could also prove valuable during surgical procedures where internal bleeding demands rapid control. The project represents a growing trend of defense research transitioning into civilian benefit, similar to earlier spinoffs like GPS and microwave ovens.
The study was published October 28, 2025, in Advanced Functional Materials, a top-tier journal specializing in chemistry and materials engineering. The work received the 2025 KAIST Q-Day President's Award and the Minister of National Defense Award at the 2024 KAIST-KNDU National Defense Academic Conference, recognizing both scientific innovation and strategic importance.
Author Jessica Williams: "A one-second hemostatic agent could genuinely reshape trauma medicine, but the real test comes in the field where conditions are never as clean as laboratory benches."
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