Figure 2.

(a,e) Confocal laser scanning microscope (CLSM) images of isopropyl-beta-D-thiogalactopyranoside (IPTG)-induced E. coli and human acute lymphoblastic leukemia cells (CCRF-CEM) incubated with GO-PEG-NH₂ (50 μg/mL) for 30 min; (b,f) CLSM images of bright field and fluorescent images of the supernatant after incubation for 60 min. To further determine the selectivity of GO-PEG-NH₂ for bacteria, IPTG-induced E. coli and CCRF-CEM cells were incubated with GO-PEG-NH₂ at 37 °C for 30 min., respectively. (c,g) CLSM images of bacteria adsorbed on GO-PEG-NH₂; (d,h) The cells were incubated with GO-PEG-NH₂ for 30 min. and normally dispersed in the solution. The fluorescence of IPTG-induced E. coli is highlighted in green.