Shafiei Gita, Ghorbani Mohammad, Hosseini Hamed, Sadeghi Mahoonak Alireza, Maghsoudlou Yahya, Jafari Seid Mahdi
Department of Food Science and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgān, Iran.
Food Additives Department, Food Science and Technology Research Institute, Khorasan Razavi Branch, Research Center for, Iranian Academic Center for Education, Culture and Research (ACECR), Mashhad, Iran.
J Food Sci Technol. 2020 Jul;57(7):2433-2442. doi: 10.1007/s13197-020-04278-9. Epub 2020 Jan 29.
To estimate the oxidative stability of the raw and roasted hazelnuts, accelerated shelf-life testing (ASLT) was used at elevated temperatures (55, 65 and 75 °C) at water activity (a) of 0.43. Chemical parameters, including peroxide value (PV), para-anisidine value, and total oxidation value were measured to estimate the oxidative stability of the samples using Arrhenius model. In addition, the samples were maintained for 8 months in a real condition at 20-30 °C (long-term shelf-life testing) for validating the results obtained from short-term ASLT. The maximum activation energy (E, 78.76 kJ/mol °K) and Q (1.871) was obtained for PV in raw hazelnuts, while the minimum E (53.36 kJ/mol °K) and Q (1.552) were recorded for PV in roasted hazelnuts, indicating the negative effect of roasting process on the oxidative stability of the samples. In order to validate the estimations, the values predicted by short-term ASLT for each oxidation index were plotted versus their corresponding values in actual storage. The results showed good correlation coefficients (R = 0.91-0.98), confirming the fitness of the Arrhenius model to predict the oxidative indices of the samples during normal storage.
为了评估生榛子和烤榛子的氧化稳定性，在水活度（a）为0.43的条件下，于高温（55、65和75°C）下进行加速货架期试验（ASLT）。测量了包括过氧化值（PV）、对茴香胺值和总氧化值在内的化学参数，以使用阿伦尼乌斯模型评估样品的氧化稳定性。此外，将样品在20 - 30°C的实际条件下保存8个月（长期货架期试验），以验证从短期ASLT获得的结果。生榛子中PV的最大活化能（E，78.76 kJ/mol °K）和Q（1.871）被测得，而烤榛子中PV的最小E（53.36 kJ/mol °K）和Q（1.552）被记录，这表明烘焙过程对样品氧化稳定性有负面影响。为了验证估计值，将短期ASLT预测的每个氧化指数的值与其在实际储存中的对应值进行绘图。结果显示出良好的相关系数（R = 0.91 - 0.98），证实了阿伦尼乌斯模型适用于预测正常储存期间样品的氧化指数。
