... Volume. Page. ... Molecules 2007, 12(5), 1136-1146; doi:10.3390/12051136. ... After culturing for 12 h at 37 °C and 5% CO 2 , cells were incubated with various concentrations of the samples for 24 h. MTT was added at a terminal concentration of 5μg/mL and incubated with the cells ...