I'm Ploypailin Kittiyan and my nickname is Yok. I had graduated major in Agro industry at King Mongkut's Institute of technology Ladkrabang. I was internship at Thai catering suvarnabhumi last year. At the internship place which I detect for bacterium in cooked food and raw material such as Salmonella, stapphylococcus aureus, E. Coli, bacillus cerues and coliform and My project has already done about disinfection of Salmonella on stainless steel surface by using QuAternary ammonium compound