• How does refining affect phenolic content of rapeseed oil?
  • Refining significantly changes phenolic content of rapeseed oil. Phenolic 4-vinylsyringol dimerizes during refining. Dimerization occurs through acid-catalyzed intramolecular ring closure reaction. Crude oil phosphorus content affects dimerization of 4-vinylsyringol.
  • Does rapeseed oil have physicochemical properties and oxidative stability?
  • Although many researchers have investigated the physicochemical properties of rapeseed oil, there is still a lack of information on the physicochemical properties and oxidative stability as it relates to different rapeseed varieties during refining process.
  • What is rapeseed oil refining process?
  • Towards this, the crude rapeseed oil needs refining treatments to remove undesirable ingredients and produce higher quality oils [ 5 ¨C 7 ]. Traditional rapeseed oil refining processes generally involve four successive operations: neutralization, degumming, bleaching and deodorization.
  • Does rapeseed oil differ after refining?
  • Differences were considered statistically significant at P< 0.05. The AV, PV, p -AV of the rapeseed oil in varieties after each refining process are shown in Fig 1. The AV of five different kinds of crude rapeseed oils were from 2.15 to 3.59 mg KOH/g and decreased significantly after neutralization, ranging from 0.29 to 0.45 mg KOH/g.
  • What are the adverse effects of crude rapeseed oil?
  • Phosphatides, free fatty acids, odiferous volatiles, colourant, waxes and metal compounds, which are undesirable materials in crude rapeseed oil products, have adverse effects on physicochemical properties, sensory characteristics, and storage stability of the rapeseed oil.
  • Which phenolic compound is undetectable in crude rapeseed oil?
  • Crude rapeseed oil is rich in phenolics and its most abundant compound is 4-vinylsyringol. More than 90% of phenolic compounds are lost during refining, mostly reflecting loss of 4-vinylsyringol. The present work detected a phenolic compound that was undetectable in crude oil but that formed during the refining: 4-vinylsyringol dimer.