DNA fragmentation assay by agarose gel electrophoresis

Qualitative analysis of DNA fragmentation was performed by agarose gel electrophoresis of total genomic DNA extracted from untreated and allicin treated promastigotes. Leishmania promastigotes were exposed to allicin (30 μM and 60 μM) for 24, 48 and 72h. After drug exposure cells were washed twice in sterile PBS (1000 xg, 10 min, RT) and the total DNA was extracted from the cell pellet (10⁸ promastigotes) using the Apoptotic DNA ladder kit (Roche) following manufacturer’s protocol. The DNA was quantified at 260/280 nm using a NanoDrop ND-1000 spectrophotometer. The genomic DNA (5 μg) was run on a 2% agarose gel containing SYBR Safe DNA gel stain for 1 h at 100 V and visualized under UV light using the DNA Molecular Weight marker XIV (Roche).