Effects of microwave pretreatment on oxidation of pressed rapeseed oil during accelerated storage

作     者：Qi Zhou Chang Zheng Chuyun Wan Pingmei Guo Wenlin Li Changsheng Liu Fenghong Huang 

作者机构：Key Laboratory of Biology and Genetic Improvement of Oil Crops Ministry of Agriculture Oil Crops Research InstituteChinese Academy of Agricultural Sciences Wuhan China Oil Crops and Lipids Process Technology National & Local Joint Engineering Laboratory Key Laboratory of Oilseeds Processing Ministry of Agriculture Hubei Key Laboratory of Lipid Chemistry and Nutrition Wuhan China 

出 版 物：《Oil Crop Science》 (中国油料作物学报(英文版）)

年 卷 期：2017年第2卷第3期

页      面：169-180页

学科分类：0832[工学-食品科学与工程（可授工学、农学学位）] 08[工学] 083202[工学-粮食、油脂及植物蛋白工程] 

基　　金：We would like to thank sensory analyses team fortheir valuable discussion. Financial support was providedby the NSFC 31501528 and NSFC 31501409in China, Industry Technology System of Rapeseedand Special Fund for Agro-scientific Research in thePublic Interest(201303072) Agricultural Science andTechnology Innovation Project of Chinese Academyof Agricultural Sciences(CAAS-ASTIP-2013-OCRI) Earmarked Fund for China Agriculture ResearchSystem(CARS-13) 

主　　题：rapeseed oil microwave pretreatment synthetic antioxidant volatile oxidative compounds accelerated storage 

摘      要：To investigate advantages of microwave pretreatment for oil storage, oxidative stability of pressed rapeseed oil with microwave pretreatment (M-RO) was evaluated, while pressed rapeseed oil (RO) and RO with 200 ppm tertiary butylhydroquinone added (T-RO) were used for comparison. Oil samples were collected after accelerated storage at 60oC in dark for 0-32 d. A total of 37 oxidized volatile compounds were identified and 9 typical key compounds were quantified by solid-phase microextraction gas chromatography/mass spectrometry (HS-SPME-GC/MS). Correlation analysis showed that lipid oxidation parameters and induction time (IP) had significant association with typical indicators of volatile oxidized compounds. Hexanal and (E,E)-2,4-heptadienal were most suitable for differentiating RO sample at different storage times while 1-hexanol, 1-heptanal and (E)-2-octenal were suitable for T-RO sample. To M-RO sample, 5 substances described above together can provide a guide for monitoring lipid oxidation. M-RO has better oxidation resistance than RO, with advantage of 4 d in accelerated conditions both in sensory evaluation and PCA analysis. However, it still produces more volatile oxidized compounds and has higher peroxide value (PV) and p-anisidine value (p-AV) than T-RO sample at any sampling point. Anti-oxidation efficiency of rapeseed oil can be promoted via microwave pretreatment. This work provid new clues of benefits about microwave pretreatment in oil storage.