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Wroniak M., Rękas A., Ratusz K., 2016. Influence of impurities in raw material on sensory and physicochemical properties of cold-pressed rapeseedoil produced from conventionally and ecologically grown seeds. Acta Sci.Pol. Technol. Aliment. 15 (3), 289-297

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original articleIssue 15 (3) 2016 pp. 289-297

Małgorzata Wroniak, Agnieszka Rękas, Katarzyna Ratusz

Department of Food Technology, Warsaw University of Life Sciences - SGGW, Warsaw, Poland

Influence of impurities in raw material on sensory and physicochemical properties of cold-pressed rapeseedoil produced from conventionally and ecologically grown seeds

Abstract

Background. The main problem of cold-pressed technology is its low yield and the varying quality of the end product, which is dependent on the quality of the raw material, technological process applied and also on conditions of packaging and storage. The effects of different contents of impurities in rapeseed on the sensory, physicochemical properties and oxidative stability of rapeseed oil produced by cold-pressing were investigated.
Material and methods. Cold-pressed oil produced from conventionally grown rapeseeds (individual cultivars and industrial seeds) and certified ecological rapeseeds. Quantified quality parameters included the following: the content of impurities, acid value, peroxide value, spectrophotometric indices (K232, K268), oxidative stability determined by the Rancimat test, pheophytin a content, and sensory assessment.
Results. The seeds which were homogenous in terms of cultivar contained the lowest level of impurities (up to 1.3%) and differed significantly in this regard from ecological and industrial seeds. It was found that the presence of impurities exerts an adverse effect on the sensory and physicochemical characteristics of the oil. Impurity content exceeding 5% resulted in the appearance of off -flavours, such as woody, strawy and fusty/musty. Furthermore, a positive correlation was found between impurity content and acid value (r = 0.781), peroxide value (r = 0.656), anisidine value (r = 0.645), K232 (r = 0.625), while in the case of oxidative stability, no such correlation was observed.
Conclusions. The type and percentage of seed impurities in the rape crop determines the sensory and physicochemical properties of the cold-pressed oil. It seems advisable, therefore, to minimize the amount of impurities, in order to obtain high-quality cold-pressed rapeseed oil.

Keywords: rapeseed, impurities, cold-pressing, quality indices, sensory evaluation, oxidative stability
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http://www.food.actapol.net/issue3/volume/6_3_2016.pdf

http://dx.doi.org/10.17306/J.AFS.2016.3.28

For citation:

MLA Wroniak, Małgorzata, et al. "Influence of impurities in raw material on sensory and physicochemical properties of cold-pressed rapeseedoil produced from conventionally and ecologically grown seeds." Acta Sci.Pol. Technol. Aliment. 15.3 (2016): 289-297. http://dx.doi.org/10.17306/J.AFS.2016.3.28
APA Wroniak M., Rękas A., Ratusz K. (2016). Influence of impurities in raw material on sensory and physicochemical properties of cold-pressed rapeseedoil produced from conventionally and ecologically grown seeds. Acta Sci.Pol. Technol. Aliment. 15 (3), 289-297 http://dx.doi.org/10.17306/J.AFS.2016.3.28
ISO 690 WRONIAK, Małgorzata, RęKAS, Agnieszka, RATUSZ, Katarzyna. Influence of impurities in raw material on sensory and physicochemical properties of cold-pressed rapeseedoil produced from conventionally and ecologically grown seeds. Acta Sci.Pol. Technol. Aliment., 2016, 15.3: 289-297. http://dx.doi.org/10.17306/J.AFS.2016.3.28