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Evaluation of the Oxidative Stability of Diacylglycerol-Enriched Soybean Oil and Palm Olein Under Rancimat-Accelerated Oxidation Conditions

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Journal of the American Oil Chemists' Society

Abstract

The oxidative stability of diacylglycerol (DAG)-enriched soybean oil and palm olein produced by partial hydrolysis using phospholipase A1 (Lecitase Ultra) and molecular distillation was investigated at 110 °C by the Rancimat method with and without addition of synthetic antioxidants. Compared with triacylglycerol oils, the DAG-enriched oils displayed lower oxidative stability due to a higher content of unsaturated fatty acids and a lower level of tocopherols. With the addition (50–200 mg/kg) of tert-butylhydroquinone (TBHQ) or ascorbyl palmitate (AP), the oxidative stability indicated by induction period (IP) of these DAG-enriched oils under the Rancimat conditions was improved. The IP of the diacylglycerol-enriched soybean oil increased from 4.21 ± 0.09 to 12.64 ± 0.42 h when 200 mg/kg of TBHQ was added, whereas the IP of the diacylglycerol-enriched palm olein increased from 5.35 ± 0.21 to 16.24 ± 0.55 h when the same level of AP was added. Addition of TBHQ, alone and in combination with AP resulted in a significant (p ≤ 0.05) increase in oxidative stability of diacylglycerol-enriched soybean oil. AP had a positive synergistic effect when used with TBHQ.

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Acknowledgments

The financial support from the Science and Technology Council of Guangdong under grant 2008A01090003 and the Ministry of Science and Technology of People’s Republic of China under grant 2006BAD27B04 is gratefully acknowledged. Furthermore, the authors acknowledge the assistance of Dr. Michael G. Jackson and Dr. Jiuwei Teng, Department of Food Quality and Safety, Jinan University, Guangzhou, China, in the preparation of this article.

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Authors and Affiliations

  1. College of Light Industry and Food Science, South China University of Technology, Wushan Rd. 381, 510641, Guangzhou, China

    Yong Wang & Mouming Zhao

  2. Department of Food Science and Engineering, Jinan University, 510632, Guangzhou, China

    Yong Wang, Shuze Tang, Keke Song, Xue Han & Shiyi Ou

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  1. Yong Wang
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  2. Mouming Zhao
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  3. Shuze Tang
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  4. Keke Song
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  5. Xue Han
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  6. Shiyi Ou
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Correspondence to Mouming Zhao.

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Wang, Y., Zhao, M., Tang, S. et al. Evaluation of the Oxidative Stability of Diacylglycerol-Enriched Soybean Oil and Palm Olein Under Rancimat-Accelerated Oxidation Conditions. J Am Oil Chem Soc 87, 483–491 (2010). https://doi.org/10.1007/s11746-009-1521-1

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  • DOI: https://doi.org/10.1007/s11746-009-1521-1

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