The present invention relates generally to compositions and methods comprising abiotic, synthetic polymer nanoparticles (NPs) with affinity and specificity to peptide toxins, enzymes, signaling proteins and other large biomacromolecules. The synthetic polymer NPs are an improvement over the current art due to insusceptibility to phospholipase attack, a mechanism common to many venoms. In one embodiment, the compositions and methods relate to synthetic polymer NPs with affinity and specificity to three finger toxins (3FTX) and phospholipase A2. In one embodiment, the compositions and methods are useful for delaying or preventing tissue necrosis due to envenomation.