| 110 fresh, near shelf life and outdated DHA, ARA and ALA oil powder samples were collected. The peroxide values(POVs), p-anisidine values(PAVs), total oxidation values, propanal and hexanal contents were detected. And the correlation analysis was used to evaluate the relationship between the propanal+hexanal content and the POVs, the PAVs, and the total oxidation values. Pearson correlation analysis showed that the correlation was statistically and extremely significant(P<0.01). And the correlation coefficients between the propanal+hexanal content and the POVs, the PAVs, the total oxidation values were 0.663,0.869 and 0.846, respectively. Nonlinear fitting results showed that the changes of propanal+hexanal content with the POVs, the PAVs and the total oxidation were simulated, and the corresponding correlation coefficients were 0.726 4, 0.989 0 and 0.978 4. It was feasible and convenient to evaluate the oxidation level of oil powder by detecting the propanal+hexanal content, especially in the later periold of oxidation. |
