The influence of rapeseed moisture content and storage temperature on changes in their technological quality
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| Authors: | Marzena Gawrysiak-Witulska1, Jolanta Wawrzyniak1, Robert Rusinek2 1Institute of Plant Origin Food Technology, Faculty of Food Science and Nutrition ul. Wojska Polskiego 28, 60-637 Poznań 2Institute of Agrophysics PAS, 20-290 Lublin, ul. Doświadczalna 4, 20-290 Lublin, Poland |
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| Abstract : | The aim of this study was to investigate the effect of adverse storage conditions of rape seeds on increase in free fatty acid content in the extracted oil. Experimental material comprised seeds of rape cv. Californium stored in a thermostat chamber (25±1 and 30±1°C) equipped with three hygrostats used to maintain constant relative humidity. Prior to the experiment, rape was wetted to moisture contents of 10.5, 12.5 and 15.5%. Seeds were stored until their germination decreased below 75%. It has been shown that during the storage of seeds with moisture content of 15.5% at 25 and 30°C an increase of the acid number above 3 mg KOH g–1 followed earlier than the reduction in the germination energy below 75%. Such a relationship was not noted in the case of seeds with moisture content of 10 and 12.5%. In addition, an increase in storage temperature from 25 to 30°C caused more than a twofold rise in the constant of increment of free fatty acids for seeds with moisture content of 10%, and almost tripled for seeds with 15.5% moisture content. |
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| Keywords : | rape, oil, storage, quality, acid value | ||||||||
| Language : | polish | ||||||||