GC-MS was operated at 70 eV in the EI
mode over the range 35-450 amu, column used was
SPB-5 column, 30m x 0.25 mm, film thickness =
0.25μm, (Supelco, Sigma-Aldrich Co.). Carrier gas
was helium at flow rate 1 ml/minute. The collected
volatiles were thermally desorbed at 250oC for 2
minute after desorption, the oven was heated rapidly
to 60oC and maintained at this temperature for 2 min
before the temperature was increased at 10oC min-1
to 220oC (10 min). The constituents of samples were
tentatively identified by matching their mass spectra
with those recorded in the computer library (NIST98
and Wiley library). Data were analyzed as mean of
two replications.