Protease I Serine -Protease II * Shown to degrade some collagen types. **Not present in A. baumannii ATCC17978. Gelatin has potential advantages as a matrix for sensing bacterial proteases due to its biocompatibility, biodegradability, and low cost. It is already used as a key component of commercial wound dressings in brands such as DuoDerm® and Granuflex®. One disadvantage of gelatin is its animal origin leading to usage restriction in some countries as well as not having a well-defined amino-acid sequence. Gelatin is a polypeptide generated by partial hydrolysis and denaturation of collagen , which is the major protein in tissues and bones.