Abstract :
Samples from six reference decentralised facilities and one industrial production unit of rapeseed
oils were taken for the evaluation of the infl uence of production processes to the properties specifi ed
in the technical standard; in the laboratories, the properties limited by the standard for rapeseed
oils were determined. In addition, long-term monitoring of changes in the oxidation stability in the
storage test of rapeseed oils additived in the quantities of 200, 400 and 600 mg.kg?1 of the Baynox
antioxidant was started. The results confi rmed that the critical points in the rapeseed oil production
process consist in the contamination with ash-forming elements, such as phosphorus, magnesium,
calcium and overall impurities. Not only in the case of hot pressing, but also in two-step cold pressing
of rapeseed it is necessary to reduce the content of ash-forming elements using additional processes,
such as degumming, neutralisation and whitening. The safety step consisting of fi ltration down to
maximum particle size of 1 ?m must be always in place before the oil distribution. A positive eff ect
of the Baynox antioxidant was clearly proved. As 200 mg.kg?1 of Baynox was added, the oxidation
stability value increased from 8 to 9.05 hrs immediately a er the pressing with a consequent decrease
to 6 hrs a er 270 days. With using of addition 400 ppm Baynox decreased oxidation stability under
6 hours not until a er 390 days of storage. With addition 600 ppm Baynox the oxidation stability
of rapeseed oil even a er 510 days of storage makes 6.5 hours. The quality monitoring brought
about necessary fi ndings and knowledge for the optimisation of the rapeseed oil production and
distribution as engine fuels. In addition, it serves as an initial supporting document for the creation of
the necessary quality control system.
