Same volume of chloroform/isoamyl alcohol (24:1) was
added to the mixture and centrifuged at 12,000 g for 5 min afterwards
to precipitate out polysaccharides. The supernatant was
collected and equal volume of phenol/chloroform/isoamyl alcohol
(25:24:1) was added to it. The solution was thoroughly mixed and
centrifuged at 12,000 g, the proteins were precipitated out and
supernatant was collected. Isopropanol was added to the supernatant
that precipitate the DNA. The mixture was centrifuged at
12,000 g for 5 min and removed the supernatant. The DNA was
resuspended in 100 mL TE buffer having RNase and stored at 20 C
for further analysis.