Abstract
Accelerated ageing of curcubitea pepo seed oil was followed by simulation of UV (light) and ambiant oxygen actions held separately then simultaneously in order to know the effects of these parameters on this oil resistance to deterioraton. Nine withdrawals had undergone analyses by titrimetry supported by spectroscopic analyses notably MIR (Medium Infrared), DSC (Differential Scanning Calorimetry) and also a gas chromatography for the composition in FA. This study has showed that pumpkin seed oil displays a weak resistance to UV which results among other in decrease of unsaponifiable compounds. Its oxidization takes place very quickly in the presence of ambiant oxygen. However the accumulated action of the two factors weakens to the highest degree pumpkin seed oil and these results in polymerization. It has also enabled us to show the link between the formation of recticulations in the oil matrix and variations at the level of the molecular structure of pumpkin seed oil.
Highlights
The big family of Curcubitea and notably the pepo species has been the subject of several studies. Goetz (2009) proved for example that pumpkin seedoil delays the inflammations of prostate; it was proved that this oil has a positive effect on the regulation of blood flow, its use for the bodily massages (Sedghi et al, 2008). Fruhwirth and Hermetter (2007) highlighted the importance of the biologic activities bound to this oil. Grondin et al (2002) prepared datasheets for some tropical Curcubitea oils
We have shown on the occasion of the study of ageing during storage in two very different conditions of pumpkin seed oil that the conditions of preservation in Brazzaville facilitates the alteration of this oil
One can say that the action of the UV favours on the one hand TAG cuts in order to free Fatty Acids (FA), the increase of the measured acid indices and on the other hand, an accumulation of hydroperoxydes in pumpkin seed oil, the strong values of the obtained peroxides indices
Summary
The big family of Curcubitea and notably the pepo species has been the subject of several studies. Goetz (2009) proved for example that pumpkin seedoil delays the inflammations of prostate; it was proved that this oil has a positive effect on the regulation of blood flow, its use for the bodily massages (Sedghi et al, 2008). Fruhwirth and Hermetter (2007) highlighted the importance of the biologic activities bound to this oil. Grondin et al (2002) prepared datasheets for some tropical Curcubitea oils. Mvoula-Tsieri et al (2008) compared the FA and the TAG of some Curcubiteas of the Congo-Brazzaville and Nakavoua et al (2011) followed the ageing of this Curcubitea oil in two regions of the Congo-Brazzaville during their storage in two very different conditions. All these studies have contributed to know and make better known the Curcubitea oil, in comparison with other edible vegetable oils; the oil studied in this study represents less than 1% of the world consumption in oil and vegetable fat. Olive oil for example, widely-known represents only 3% of the human consumption. It is farexceeded by soya oil (27%), palm oil (20%), colza seed oil (15%)
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