Cell lines were cultured in iscove's modified dulbecco's medium (IMDM) supplemented with 10 % fetal bovine serum (FBS) and 100 IU• mL–1 penicillin, and 100 mg• mL–1 streptomycin. When the cells reached 70 % to 80 % confluence, they were harvested and plated for consequent passages or for kaffir lime leaf fractional extract
treatments. Cells were trypsinised, resuspended in media and counted using a haemocytometer. The cell number was adjusted to 40 000 cells • mL–1 with media and added to 96-well. After 5 d incubation at 37 °C in 5 % CO2, 25 μL of MTT 2 mg• mL–1 was added. After an additional incubation time for 4 h at 37 °C in 5 % CO2, the cells were solubilised using 100 μL of a 20 % sodium dodecyl sulphate (SDS) solution in purified water and dimethylformamide (1 : 1) adjusted to pH 4.7. This step to lyse the cells and dissolve the precipitated formazan. The absorbance was read in a plate reader at 600 nm. The higher the absorbance value, the more converted formazan is present and so the higher the number of viable, proliferating cells. Note the outer edge of the plate is not used to test compounds to avoid edge effects.
MTT assay (Microculture Tetrazolium Salt) is a colorimetric test based on the reduction of yellow MTT to purple formazan by cellular dehydrogenases, which are only active in living, proliferating cells. This test is capable of measuring viability, proliferation, and cell activation. The more converted formazan present, the higher the number of viable and proliferating cells.
Cell lines were cultured in iscove's modified dulbecco's medium (IMDM) supplemented with 10 % fetal bovine serum (FBS) and 100 IU• mL–1 penicillin, and 100 mg• mL–1 streptomycin. When the cells reached 70 % to 80 % confluence, they were harvested and plated for consequent passages or for kaffir lime leaf fractional extracttreatments. Cells were trypsinised, resuspended in media and counted using a haemocytometer. The cell number was adjusted to 40 000 cells • mL–1 with media and added to 96-well. After 5 d incubation at 37 °C in 5 % CO2, 25 μL of MTT 2 mg• mL–1 was added. After an additional incubation time for 4 h at 37 °C in 5 % CO2, the cells were solubilised using 100 μL of a 20 % sodium dodecyl sulphate (SDS) solution in purified water and dimethylformamide (1 : 1) adjusted to pH 4.7. This step to lyse the cells and dissolve the precipitated formazan. The absorbance was read in a plate reader at 600 nm. The higher the absorbance value, the more converted formazan is present and so the higher the number of viable, proliferating cells. Note the outer edge of the plate is not used to test compounds to avoid edge effects. MTT assay (Microculture Tetrazolium Salt) is a colorimetric test based on the reduction of yellow MTT to purple formazan by cellular dehydrogenases, which are only active in living, proliferating cells. This test is capable of measuring viability, proliferation, and cell activation. The more converted formazan present, the higher the number of viable and proliferating cells.
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