Instant Protection Spray for Anti‐Infection and Accelerated Healing of Empyrosis

Distinct from common injuries, deep burns often require a chronic recovery cycle for healing and long‐term antibiotic treatment to prevent infection. The rise of drug‐resistant bacteria has caused antibiotics to no longer be perfect, and continuous drug use can easily lead to repeated infection and even death. Inspired by wild animals that chew plants to prevent wound infection, probiotic extracts with a structure similar to the tailspike of phage are obtained from Lactobacillus casei and combined with different flavones to design a series of nonantibiotic bactericides. These novel antibacterial agents are combined with a rapid gelation spray with a novel cross‐angle layout to form an instant protection spray (IPS) and provide a physical and anti‐infectious barrier for burns within 30 s. This IPS is able to sterilize 100.00% and 96.14% of multidrug‐resistant Staphylococcus aureus (MRSA) in vitro and in vivo, respectively. In addition, it is found to effectively reduce inflammation in MRSA‐infected burns in rats and to promote tissue healing. An instant protection spray based on an angle layout can form a hydrogel film on burns in 30 s. The spray‐loaded microparticles formed from probiotic extracts and flavones can provide a physical and anti‐infection barrier for burns and promote healing, together with the hydrogel film.