Ampicillin (AMP)b-lactamAntibioticsChemosensorBiosensorSOLID-PHASE EXTRACTIONBETA-LACTAM ANTIBIOTICSSPECTROPHOTOMETRIC DETERMINATIONSILVER NANOPARTICLESIONIC LIQUIDELECTROCHEMICAL APTASENSORANTIMICROBIAL ACTIVITIESANTIBACTERIAL ACTIVITYGAS-CHROMATOGRAPHYIN-VITRO