lipid A Lipid A 14 article 14 Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization 10 chemistry 8 mass spectrometry 8 nonhuman 8 Amines 6 Dansyl Compounds 6 Horseradish Peroxidase 6 Hydrazines 6 Lipopolysaccharides 6 O Antigens 6 O antigen 6 Salmonella enterica 6 bacterium lipopolysaccharide 6 horseradish peroxidase 6 hydrazine 6 matrix assisted laser desorption ionization time of flight mass spectrometry 6 methodology 6 Bacteria 4 Core oligosaccharide 4 Cyanogen Bromide 4 Mass spectrometry 4 amine 4 bacterial strain 4 carbohydrate analysis 4 controlled study 4 dansyl chloride 4 dansyl hydrazine 4