IgG immunoglobulinG IR infrared IS internalstandard LC liquidchromatography LOD limitofdetection LOQ limitofquantification MALDI-TOF matrix-assistedlaserdesorptionionization-timeofflight Mr relativemolecularmass MRM multiplereactionmonitoring MS，MS／MS massspectrometry，tandemmassspectrometry NAD，NADH （NADP，NADPH） nicotinamide-adeninedinucleotide（phosphate）NMR nuclearmagneticresonance PCR polymerasechainreaction QuEChERS quick，easy，cheap，effective，ruggedandsafe r correlationcoefficient RNA，RNase ribonucleicacid，ribonuclease RP… reversed-phase…RSD relativestandarddeviation （preferredovercoefficientofvariation）SD standarddeviation SIM selectedionmonitoring S ／N signal／noise SPE，SPME solidphaseextraction，solidphasemicroextraction SRM selectedreactionmonitoring TLC thin-layerchromatography Tris tris（hydroxymethyl）aminomethane UPLC ultraperformanceliquidchromatography UV ultraviolet Vis visible