chemical modification buccal peptide/protein drugs / lipid carrier systems / patch systems / carrier systems / chemical modification acylation / chemical vector delivery / chemical enhancers / colon specific systems / dendrimer carrier / injection devices / polymeric nanoparticles injection device technology / viral technology examples / mixed delivery systems / chemical modification / sulfhydryl delivery systems / bioadhesive systems / nano/microparticle systems / lipid-based delivery systems / tablet technologies / thermal gelling systems / in situ depot forming systems / precipitation systems / depot forming systems / methodology chemical procedures / precipitation depot systems / gas auto-injector / polymeric nano/microparticles polymeric nano/microparticles antigen delivery systems / vaccine systems / nanoparticle-based systems / vaccine delivery systems / nanoparticle systems / mucoadhesive systems / particulate antigen systems / chemical enhancers buccal absorption / /