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Storage stabilities of fuel grade camelina, sunflower and rapeseed methyl esters.
Frohlich, A.
Frohlich, A.
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1999-12-01
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Fröhlich, A., Storage stabilities of fuel grade camelina, sunflower and rapeseed methyl esters, End of Project Reports, Taeagsc, 1999.
Abstract
The storage stabilities of fuel grade camelina, sunflower and rapeseed methyl
esters were evaluated in airtight and open containers. Commercial amounts (200
litres) of the methyl esters were stored in airtight drums and sampled regularly, and
the effects of air exposure were evaluated from sixteen days laboratory-scale
accelerated storage tests at 65oC. None of the methyl esters in airtight drums
deteriorated during eighteen months of storage; composition, viscosities and free
fatty acid levels remained unchanged. The accelerated storage test in open
containers, however, indicated that exposure to air can cause rapid oxidation of
each of the three methyl esters. However, oxidation can be delayed by the
presence of tocopherols (natural antioxidants) in the methyl ester, and it can be
further delayed by the presence of an unidentified carotenoid. The exceptional
stability of rapeseed methyl ester seems to be due to a combination of relatively
high levels of Μ-tocopherol and the unidentified carotenoid. The rates of
oxidation (i.e. rate of increase of viscosity etc.) of sunflower and camelina methyl
esters were about the same, but rapeseed methyl ester oxidised slower. The
observed relative rates of oxidation could be predicted from the levels of reacting
double bonds calculated from the oxidation data, but not from iodine numbers.