sentence: Such aptasensors could be useful for identifying the presence of ampicillin residues in the food and environment.Specific aptamers have also been developed and used for detection of other antibiotics such as Florfenicol ( Sadeghi et al ., 2018 ) , Cefquinome ( Wang et al ., 2018 ) , Kenamycin ( Xu et al ., 2015 ) , Oxytetracyclin ( Xu et al ., 2018 ) , Tetracyclin ( Zhou et al ., 2018 ) and , Chloramphenicol ( Yan et al ., 2018 ) , which allowed rapid and sensitive colorimetric detection by naked eye or using a colorimeter with detection limit of 0.0031 ng / mL .