RESEARCH ARTICLE Fast‐Switching High‐Voltage Porous‐Tip Electrospray Ionization Mass Spectrometry for Rapid Detection of Antirheumatic Drugs in Adulterated Herbal Dietary Supplements Ya‐Nan Yao Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Engineering Research Center for On‐line Source Apportionment System of Air Pollution, Jinan University, Guangzhou, 510632 China Search for more papers by this author Lin Wu Institute of Mass Spectrometry and Atmospheric...