Study On Storage Stability And Oxidation Regularity Of Flat-european Hybrid Hazelnut Oil

Hazelnuts are widely distributed in China.In recent years,Flat-European hybrid hazelnuts with Chinese independent intellectual property rights have developed strongly.With the development of the agricultural product processing industry,a series of processed products have emerged on the basis of traditional fried foods,the most important of which is hazelnut oil.However,hazelnut oil is prone to self-oxidation if stored improperly,resulting in unpleasant odor and bitterness,which reduces its commercial characteristics.In this paper,Flat-European hybrid hazelnut oil was used as the raw material,and the oil schaal oven accelerated oxidation method was used to dynamically predict POV,p-AV,TOTOX,fatty acids,and volatile oxidation products of the hazelnut oil.The oxidation kinetics model of fatty acid during the storage of Flat-European hybrid hazelnut oil,the volatile characteristic small molecules reflecting the degree of fatty acid auto-oxidation in hazelnut oil were screened,the correlation between fatty acid or volatile oxidation products content and three peroxidation indexes was analyzed to provide a new method,which could predict the storage and preservation of hazelnut oil at homoeothermy,for the dynamic monitoring and evaluation of Flat-European hybrid hazelnut oil.The antioxidant properties of tocopherol,a characteristic component of hazelnut oil,and the dose-effect relationship of some food-grade antioxidants in improving the shelf life of Flat-European hazelnut oil were further studied at the same time.The findings are as follows:(1)Gas chromatography and mass spectrometry were used to dynamically monitor the changes in fatty acid content of Flat-European hybrid hazelnut oil during storage.The oxidation kinetics equation of Flat-European hybrid hazelnut oil fatty acids was established,and the zero-order oxidation kinetics of linoleic acid was established,which can better reflect the change trend of fatty acids during the storage of Flat-European hybrid hazelnut oil,and establish a better correlation with the oxidation index of lipids such as peroxide value,anisidine value,and total peroxide value.(2)The solid phase microextraction combined with gas chromatography and mass spectrometry was used to determine the volatile oxidation products of hazelnut oil,and the correlation analysis was performed with the oxidation index of oils and fats.Volatile oxidation products were detected one after another on the 10 th day of oxidation,including three kinds of hydrocarbons,two kinds of alcohol,one kind of furan,11 kinds of aldehydes and three kinds of ketones.It was found that 2-decenal,2-octenal,hexanal and 3-octen-2-one can be used as an indicator to evaluate the oxidation degree of hazelnut oil.(3)The oxidation characteristics of tocopherol,a characteristic component of hazelnut oil during oil storage,and the antioxidant effects of different antioxidants on the storage period of Flat-European hazelnut oil were analyzed.When the content of α-tocopherol in Flat-European hazelnut oil filtered off tocopherol or normal one is respectively less than 500mg/kg or 300 mg/kg,it plays an anti-oxidation effect.If it exceeds this value,it will act as a pro-oxidant effect,but δ-tocopherol has no such phenomenon.During the storage of oil with two kinds of tocopherol,α-tocopherol has better anti-oxidation ability than δ-tocopherols.The antioxidant effects of various antioxidants in hazelnut oil are: gallic acid> TBHQ> VC>tocopherol.Under the adding conditions of the national standard,gallic acid,TBHQ,VC,α-tocopherol,and δ-tocopherol can respectively prolong the storage temperature of Flat-European hybrid hazelnut oil at room temperature by 720.3,318,42.3,19.5,and 9.6days compared with that without adding.