1 Rapid Detection of the Antibiotic Sulfamethazine in Pig Body Fluids by Paper Spray Mass Spectrometry Surased Suraritdechachai, a,b,† Chayan Charoenpakdee, a,c,† Iain Young, d Simon Maher, e Tirayut Vilaivan, a,c and Thanit Praneenararat a,b,* a Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Rd., Pathumwan, Bangkok, 10330, Thailand. b The Chemical Approaches for Food Applications Research Group, Faculty of Science, Chulalongkorn University, Phayathai Rd., Pathumwan, Bangkok, 10330, Thailand. Email: Thanit.P@chula.ac.th. c Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Rd., Pathumwan, Bangkok, 10330, Thailand. d Institute of Integrative Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB, United Kingdom. e Department of Electrical Engineering & Electronics, University of Liverpool, Brownlow Hill, Liverpool, L69 3GJ, United Kingdom. † These authors contributed equally in this study. *Corresponding Author Email: Thanit.P@chula.ac.th. Tel: +66-2-218-7638