Farahmandfar Reza, Naeli Mohammad Hossein, Naderi Mehdi, Asnaashari Maryam
1Department of Food Science and Technology, Sari Agricultural Sciences and Natural Resources University (SANRU), P.O. Box 578, Sari, Iran.
2Department of Food Process Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
J Food Sci Technol. 2019 Feb;56(2):695-704. doi: 10.1007/s13197-018-3525-z. Epub 2018 Dec 8.
This research was set up to identify the impact of the antioxidant compounds present in lemon balm extract (LBE) as obtained by the subcritical water (SBCW) method on the oxidative stability of corn oil. An extraction yield of 28.52% was obtained for the SBCW and rosmarinic acid was identified to be the predominant phenolic compound present in the LBE. The total phenolic content of the LBE was found to be 212.74 mg gallic acid/g extract. Subsequently, 200, 400, 800, 1600 and 3200 ppm of the LBE were added to corn oil and its peroxide value (PV), acid value (AV), conjugated diene (CD), carbonyl value (CV), oxidative stability index (OSI), total polar compound and total phenolic compounds were compared to control and the sample containing 200 ppm of the BHA throughout the 16-day Schaal oven test at 70 °C. Our findings indicated that the corn oil containing greater LBE concentration had lower PV, AV, CD, and CV but greater OSI than the control sample. Evaluation of total polar compounds confirmed lower extent of the compounds with high polarity in the greater levels of the LBE. Finally, the LBE was able to slow down the rancidity of corn oil and the samples with higher LBE exhibited gentle oxidation rate.
本研究旨在确定通过亚临界水（SBCW）法获得的柠檬香脂提取物（LBE）中存在的抗氧化化合物对玉米油氧化稳定性的影响。SBCW法的提取率为28.52%，迷迭香酸被确定为LBE中存在的主要酚类化合物。LBE的总酚含量为212.74毫克没食子酸/克提取物。随后，将200、400、800、1600和3200 ppm的LBE添加到玉米油中，并在70°C下进行为期16天的Schaal烘箱试验，将其过氧化值（PV）、酸值（AV）、共轭二烯（CD）、羰基值（CV）、氧化稳定性指数（OSI）、总极性化合物和总酚类化合物与对照以及含有200 ppm丁基羟基茴香醚（BHA）的样品进行比较。我们的数据表明，与对照样品相比，含有更高LBE浓度的玉米油具有更低的PV、AV、CD和CV，但具有更高的OSI。对总极性化合物的评估证实，在较高水平的LBE中，高极性化合物的含量较低。最后，LBE能够减缓玉米油的酸败，LBE含量较高的样品表现出平缓的氧化速率。
