2.3. Gas chromatography–mass spectrometry (GC–MS) analysis
GC–MS analysis of the essential oil derived from the seeds of
C. paniculatus was performed on Shimadzu GCMS-QP-2010 plus
system. RTx-5 Sil MS column (30 m × 0.25 mm ID, 0.25 m film
thickness) was used for the analysis. The operating conditions ofthe
column were as follows: oven temperature programme from 80 to
210 ◦C at 4 ◦C/min with hold time of 2 min and from 210 to 300 ◦C
at 15 ◦C/min with hold time of 5 min, and the final temperature
was kept for 20 min. The injector temperature was maintained at
270 ◦C,the volume ofinjected sample was 0.2 L;pressure 85.4 kPa,
total flow 76.8 mL/min, column flow 1.21 mL/min, linear velocity
40.5 cm/s, purge flow 3.0 mL/min, split ratio: 60.0; ion source temperature
230 ◦C; scan mass range of m/z 40–600; and interface
line temperature 280 ◦C. The identification of compounds was performed
by comparing their mass spectra with data from NIST05
(National Institute of Standards and Technology, US), WILEY 8, and
samples were stored in sealed vials in a refrigerator at 4 ◦C until
used for analysis. The yield of the oil was found to be 0.09% (v/w).