is preferably a polynucleotide, and the polar compound
is DPSO, which improves the ability of the
 observed that the main characteristics of GOS are their high content of alkenes and heterocyclic polar compounds
, and higher content of aromatics as compared with crude oil.
This is an example where the more polar compounds
(higher ester) did not perform as well as the less polar compounds
Non-polar and moderately polar compounds
A study by Barber and Joseph  showed that polar compounds
were less separated and not well resolved using Zorbax Eclipse XDB[C.sub.18] with a longer analysis time of 54 minutes.
The polar compounds
percentage was determined using an electrochemical sensor (Testo 270, Testo AG, Lenzkirch, Germany).
Apart from them, other polar compounds
were also found; they are quinic acid, caffeoylquinic acid isomers, and benzyl alcohol hexose-pentose.
The performance of dual ESI/APCI in analyzing both highly and weakly polar compounds
was evaluated [11,12].
Although there are approximately half the number of extracted apolar compounds compared to polar compounds
, the removal of both types of compounds affect the thermal properties of L.
The high-performance size exclusion chromatography (HPSEC) has been proved to be effective in detecting even low levels of polar compounds
, including those originated from oxidative and hydrolytic degradation of the oils [13, 14].
During the SFE-SFC, methanol is added to the mobile phase in order to solubilize more of the polar compounds
since the supercritical fluid CO2 is non-polar.
The standard sensitivity mode works well for polar compounds
such as ketones, alcohols, and esters, while the high-sensitivity mode works well for compounds such as halogenated alkanes and substituted aromatics, as well as mixtures with one or more compounds of low concentration.