03965nas a2200457 a 4500 20260817162758.0 220718s2019 th uu m rtt 0| a1eng d .b12310451 AIT Thesis no.FB-19-07 Pariyarat Worasakwuttipong Antibiogram study and identification of antibiotic resistance gene patterns in food pathogens and evaluation of antibacterial effects of probiotics 68 : ill. Thesis ; no.FB-19-07 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Food Engineering and Bioprocess Technology, School of Environment, Resources and Development Thesis (M. Sc.) - Asian Institute of Technology, 2019 The objective of this study was to analyze antibiotic susceptibility of six of the food pathogens namely Salmonella typhimurium, Staphylococcus aureus, Escherichia coli, Vibrio parahaemolyticus, Bacillus cereus and Listeria monocytogenes. Some of them showed antibiotic resistance in this study. E. coli was resistant to tetracycline antibiotics. Moreover, B. cereus and L. monocytogenes were resistant to one class of antibiotics namely ~-lactam antibiotics (ampicillin, and amoxicillin). Generally, the occurrence of resistance was due to the presence of specific genes which encoding resistant to particular antibiotics. In this study, beta-lactam (blaTEM, and blacuv) genes were detected as antibiotic resistant B. cereus and L. monocytogenes, while blasuv genes of bata-lactam were not found in the antibiotic resistant pathogens. Tetracycline (tetA) genes was detected in antibiotic resistant E. coli, while (tetB) gene were not detected. Furthermore, this study evaluates the antibacterial susceptibility of lactic acid bacteria especially Lactobacillus strains against the three AMR pathogens. The both of Lactobacillus strains exhibited the average inhibition (20-30 mm) on the growth of test pathogens. Moreover, Lactobacillus lac tis was the most effective noticeable strains in inhibiting the growth of Salmonella (31.2 ± 2.4 mm), followed by Lactobacillus casei in inhibiting the growth of L. monocytogenes (25.7 ± 0.6 mm). The occurrence of drug resistance by these common pathogens is a big challenging in food safety and threat to consumer health. In addition, this study has generated and updated new information of pathogenic antibiotic susceptibility and their resistance profiles. Probiotics Antibiotics Evaluation Antibacterial agents Evaluation Anal, Anil Kumar, Chairperson Loc Thai Nguyen, Examination committee Datta, Avishek, Examination Committee Royal Thai Government Fellowship, Scholarship Donor Asian Institute of Technology. Thesis ; no.FB-19-07 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16983 .b12310451 mnait m 240422 0 220718 m a m 0 mnait mnait mnarc mnarc 40 61 20 Barcode : 30050120879183 CREATED : 2019-05-28 RECORD # : i13189608 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : - CREATED : 2019-05-28 RECORD # : i1318961x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121024268 CREATED : 2022-12-15 RECORD # : i13419729 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121024250 CREATED : 2022-12-15 RECORD # : i13419730 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 6259 6259 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.FB-19-07 30050120879183 2026-08-17 16:27:58 1 2026-08-17 40 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.FB-19-07 2026-08-17 16:27:58 2026-08-17 61 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.FB-19-07 30050121024268 2026-08-17 16:27:58 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.FB-19-07 30050121024250 2026-08-17 16:27:58 2 2026-08-17 20