The effects of “two-phase” and “three-phase” centrifugation systems and oxygen levels during malaxation
on sensory properties and chemical composition of an unfiltered monovarietal (Cv Carboncella)
extra virgin olive oil were evaluated at 1, 4, 7, 10 and 13 months from bottling.
The design variables were regressed by Partial Least Square (PLS) analysis to model the sensory
properties' variation. Subsequently, PLS regression analyses were carried out assuming, as dependent
variable, each sensory attribute perceived by a jury of experts and, as independent variables, the volatiles
and polyphenols composition, to identify the chemicals that mainly contributed to the noticed sensory
differences. Results revealed the centrifugation system as major factor affecting the oil's sensory characteristics.
Storage time had a remarkable effect and produced comparable sensory variation in each of
the two centrifugation systems, whereas the reduction of oxygen in the malaxer atmosphere hadn't
marked effect on the oil's sensory profile. A significant change of the sensory characteristics was
registered after four months from bottling, although the oil was more stable during further storage.
Furthermore, the higher content of phenolic compounds in the oil extracted through the two-phase
centrifugal decanter did not result in higher sensory stability then that extracted in the three-phase
system.
©
The effects of “two-phase” and “three-phase” centrifugation systems and oxygen levels during malaxationon sensory properties and chemical composition of an unfiltered monovarietal (Cv Carboncella)extra virgin olive oil were evaluated at 1, 4, 7, 10 and 13 months from bottling.The design variables were regressed by Partial Least Square (PLS) analysis to model the sensoryproperties' variation. Subsequently, PLS regression analyses were carried out assuming, as dependentvariable, each sensory attribute perceived by a jury of experts and, as independent variables, the volatilesand polyphenols composition, to identify the chemicals that mainly contributed to the noticed sensorydifferences. Results revealed the centrifugation system as major factor affecting the oil's sensory characteristics.Storage time had a remarkable effect and produced comparable sensory variation in each ofthe two centrifugation systems, whereas the reduction of oxygen in the malaxer atmosphere hadn'tmarked effect on the oil's sensory profile. A significant change of the sensory characteristics wasregistered after four months from bottling, although the oil was more stable during further storage.Furthermore, the higher content of phenolic compounds in the oil extracted through the two-phasecentrifugal decanter did not result in higher sensory stability then that extracted in the three-phasesystem.©
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