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- Title
Effect of rape seeds microwave pretreatment on the composition and antioxidative properties of press rape oil.
- Authors
Nosenko, Tamara; Levchuk, Irina; Nosenko, Volodymyr; Koroluk, Tamara
- Abstract
Introduction The influence of microwave pretreatment of rape seeds on the pressing oil yield, acid and peroxide values of oil, fatty acid composition of oil, phosphorus?ontaining substances, tocopherols and carotene content in oil as well as oil oxidation stability were studied in this work. Materials and methods Peroxide and acid values of oils were determined according to procedures given by IUPAC, total phosphorus and carotenes content - by spectrophotometric methods, fatty acid composition and tocopherols content of oils - by chromatographic methods. The induction periods of oil oxidation were calculated from the curve of oxidation in the presence of 2,2-azo-bisisobutyronitrile. Results and discussion The advantages of microwave heating are very high rates of temperature increase and as a consequence the high rates of the moisture decrease. We have shown that decreasing of rape seed moisture from 13.0 to 7.2% had run during 10 and 30 min under microwave and conventional heating respectively. It was shown that pressing oil yield after microwave pretreatment of rape seeds increased by 16-90%. The final seed moisture after pretreatment was the main factor that determines the pressing oil yield. The oil yield for the seeds with the same moisture after microwave and conventional pretreatment was higher in a case of microwave pretreatment by 16%. Data obtained have shown that used microwave heating had no effect on the fatty acid composition of rape oil. But oil from the rape seeds after microwave pretreatment had lower acid and peroxide values, higher phosphorus, tocopherols and carotenes content. Increasing of oxidative stability of oil sample after seed microwave pretreatment was confirmed by rising of induction period time of oil oxidation, initiated by 2,2-azo-bis-isobutyronitrile. Induction period of control sample oil was equal to 27 min. and for sample oil from microwave pretreated seeds it was three time longer and exceed 90 min. Conclusions Microwave pretreatment of rape seeds can be used for increase of rape seeds pressing affectivity and improving of oil biological value and oxidation stability.
- Subjects
PLANT embryology; SEED production (Botany)
- Publication
Ukrainian Food Journal, 2016, Vol 5, Issue 1, p7
- ISSN
2304-974X
- Publication type
Article