PhcO parameter

The phase correction parameters PHCO and PHCl are always based on the initial spectrum obtained directly after a Fourier transformation operation. Phasing is performed with respect to a reference point which is marked on the spectrum by the spectrum cursor. When the Phase mode is first entered, the program automatically places the spectrum cursor on the tallest point in the spectrum, but you are free to move this spectrum cursor anywhere in the spectrum using the Maximum Cursor or the Perpendicular Cursor option. 

When the phase correction has been completed, click the Accept button and a message box appears on the screen. If Yes is selected then the xf2p command is executed and the F2 phase corrected spectrum will be calculated and shown on the screen. If No is selected the new values of the PHCO and PHCl parameters are stored for future use but no phase correction is performed. 

Depending on the detection mode the appropriate phase mode has to be chosen. The possible options are no, pk, me and ps for no phasing, phase correction using phase constants PHCO and PHCl, magnitude and power spectrum calculation respectively. For further information on these parameters see section 3.2.S.3. 

Table 11.1 shows that no significant differences (P < 0.01) were found between HOLL canola oil, HOSO and PHCO concerning the total assessment of the results. Nevertheless it was obvious that HOLL canola oil showed clear advantages with regard to sensory evaluation, both oil and product, while PHCO revealed better results for the chemical parameters but had the worst sensory evaluation. Further on it should be pointed out that only small differences in the chemical parameters of all oils were found. Only the total result of the assessment of PO was significantly worse than the results of the other oils (P < 0.01). 

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