a study of the quality of a local herbal tea and volatiles of parinari ...
a study of the quality of a local herbal tea and volatiles of parinari ...
a study of the quality of a local herbal tea and volatiles of parinari ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
1 0 C/min. Helium was used as a carrier gas at a constant flow <strong>of</strong> 1.2 ml/min. Spectra were<br />
obtained on electron impact <strong>of</strong> 70 eV, scanning from 35 to 550 m/z. n-Alkanes (C6-C24)<br />
were used as reference points in <strong>the</strong> calculation <strong>of</strong> retention indices (RI) Library searches<br />
were carried out using NIST, Mass Finder, Flavour <strong>and</strong> <strong>the</strong> Baser library <strong>of</strong> essential oil<br />
constituents by comparing mass spectra <strong>and</strong> retention indices (Kamatou et al., 2010).<br />
The retention index RI for an individual compound RIC was calculated using <strong>the</strong> formula:<br />
RIc = 100Z +100((log t`RC – log t`RZ)/(log t`R(Z+1)- log t`RZ))<br />
where t`RC, tRZ <strong>and</strong> t`R(Z+1) are <strong>the</strong> corrected retention times for <strong>the</strong> compound <strong>and</strong> <strong>the</strong><br />
alkanes eluting before <strong>and</strong> after <strong>the</strong> compound, respectively (Braithwaite <strong>and</strong><br />
Smith, 1996).<br />
3.11 Data analysis<br />
One way analysis <strong>of</strong> variance (ANOVA) was performed using Genstat 13 th edition to<br />
establish <strong>the</strong> differences in <strong>the</strong> mean levels <strong>of</strong> <strong>quality</strong> parameters studied between<br />
F. ancylantha <strong>tea</strong> <strong>and</strong> <strong>the</strong> control <strong>tea</strong>s. The significant differences among <strong>the</strong> means were<br />
tested at 95% confidence interval.<br />
54
Change language