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目的研究山嵛酸酰胺与芥酸酰胺的氧化稳定性。方法应用油脂氧化稳定性仪研究山嵛酸酰胺与芥酸酰胺的氧化稳定时间,并比较光照的影响;通过红外光谱仪与差示扫描量热仪(differential scanning calorimetry,DSC)研究加速氧化前后红外光谱图与热分析图谱的差异性;应用DSC研究芥酸酰胺在升温-降温-升温过程中的热特性以及山嵛酸酰胺升温过程中的热特性,并研究光照对样品热特性的影响。结果光照明显影响稳定时间,对芥酸酰胺的影响则更为敏感;加速氧化后出现羰基峰,山嵛酸酰胺在3300 cm~(-1)处峰形基本没有变化,而芥酸酰胺由双峰变为单峰,山嵛酸酰胺在700 cm~(-1)左右峰的强度无明显变化,而芥酸酰胺峰形明显增强;光照使芥酸酰胺熔融温度与结晶温度发生改变,山嵛酸酰胺除了熔融峰之外还有2个脂肪酸峰,光照影响熔融峰峰形。另外在加速氧化后进行热特性测试时,山嵛酸酰胺与芥酸酰胺熔融峰峰形正常,但峰值温度略有变化。结论山嵛酸酰胺与芥酸酰胺的油脂氧化稳定性,可以应用油脂氧化稳定性仪、差示扫描量热仪及红外光谱仪进行评价。
Objective To study the oxidative stability of behenic acid amide and erucic acid amide. Methods The oxidative stability of behenic acid amide and erucic acid amide was studied by means of oil oxidation stability tester and the influence of light irradiation was compared. The infrared spectroscopy and differential scanning calorimetry (DSC) The thermal properties of erucamide during warming-cooling-warming and the thermal properties of behenamide during heating were investigated by DSC. The effects of light on the thermal properties of the samples were also studied. Results Light exposure obviously affected the stability of erucamide, and the carbonyl peak appeared after accelerated oxidation. The peak of behenic acid amide showed no change at 3300 cm -1, Peak became single peak, the intensity of behenic acid amide at about 700 cm ~ (-1) did not change significantly, but the erucamide peak shape was significantly enhanced; light erucamide melting temperature and crystallization temperature changed, Acid amide in addition to the melting peak there are two fatty acid peaks, the impact of light melting peak shape. In addition, the thermal characteristics of accelerated oxidation after oxidation, behenamide and erucamide melting peak shape normal, but the slight change in the peak temperature. Conclusion The oxidation stability of behenic acid amide and erucic acid amide can be evaluated by oil oxidation stability tester, differential scanning calorimeter and infrared spectrometer.