Study On Oxidation Of Three Organic Gel Oils Based On Self-assembly Hydrogen Bonding

Organic gel oil has been favored by scholars in recent years because of its potential to replace trans fats and saturated fats.The most representative of organic gel oils based on self-assembly hydrogen bonding are 12-hydroxyoctadecanoic acid gel oil,ethyl cellulose(EC)gel oil and phytosterol gel oil.In this paper,the oxidation properties and oxidation evaluation methods of these three organic gel oil were investigated.The major research contents are as follows(take soybean gel oil for example):1.A detailed study on the effects of three lipid structurants on the oxidation of oil,was investigated by the headspace oxygen consumption.The results showed that 12-HSA was pro-oxidative,and the top oxygen consumption of the gel increased with the increase of adding amount and greater than the control group.EC was anti-oxidative at low temperature.The oxygen consumption level of the gel oil at low temperature was lower than that of the control group.It had both antioxidant and pro-oxidative effects at high temperatures,which was related to the amount of addition.Phytosterols were pro-oxidative,and the oxidation degree of the gel oil after accelerated oxidation was higher than that of the control group.Therefore,considering the texture and oxidation,the optimal dosage of three gel oils are 2%,6%and 6%respectively.In addition,the correlation between the results of the headspace oxygen consumption and the traditional test indexes of three gel oil was analyzed.The correlation between the peroxide value,malondialdehyde,anisamine value and the headspace oxygen consumption was better(R2>0.9).They were suitable for the oxidation evaluation of the three gel oils.The acid value was not suitable for evaluating the oxidation level of the gel oil because of the effect of lipid structurants.2.The effect of heating time and heating temperature on the oxidation of Organic gel oil hydrogen-bonding was investigated.The oxidation degree of 12-HSA gel oil was higher than that of the control group at different temperatures and heating durations,that was,12-HSA gel oil was easily oxidized.The oxidation of EC gel oil was influenced by temperature.The oxidation stability of EC gel oil was higher than that of the control group at the temperature below 120?,and the oxidation rate was faster than that of the control group when the temperature increased.When the heating time of EC gel oil was less than 2h,the oxidation stability was better than that of the control group at 120?,and the oxidation stability of the gel decreased rapidly when the heating time prolonged.The oxidation degree of phytosterol gel oil at different temperatures was similar to that of the control group,and the gel oil had more slow oxidation and more stable properties than the control group at high temperature.3.The prediction models for three physicochemical indicators of three gel oils were established by Using Fourier transform infrared spectroscopy and different quantitative analysis methods.The prediction models of peroxide value,malondialdehyde and anisamine value of three gel oils were established by using Partial Least Squares(PLS).The determining coefficient of modeling were above 0.95,and the Relative Predicted Deviation(RPD)were between 2.03 and 9.86,and the prediction accuracy was higher.4.The variation of oxidation products of gel oils was studied by 1H-NMR,and the correlation between the area of signal peak and the total oxidation value of gel oil was analyzed.The trend of the oxidation products on the 1H-NMR spectrum was consistent with the trend of peroxide values and anisidine values.The total oxidation value of the three gel oils had a good correlation with Rao and Rad(R2>0.9)in the 1H-NMR spectrum.It showed that 1H-NMR can be used to estimate the total oxidation value of three organic gel oil hydrogen-bonding,which could be used as a fast and nondestructive method for estimating the stability of the oxidation stability.