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Freeze-dried microalgae of Nannochloropsis oculata improve soybean oil's oxidative stability

  • Biotechnological products and process engineering
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Abstract

Marine microalga Nannochloropsis oculata possesses nutrients valuable for human health. In this study, we added freeze-dried N. oculata powder to soybean oil and observed a remarkable inhibition in oil oxidation. The amount of microalgae powder added was positively correlated to the increase in oil stability. The addition of 5.0 % (w/w) microalgae powder increased the oil stability index (OSI) values of soybean oil more than twofold at the tested temperatures 120 and 130 °C. N. oculata contains high levels of both phenolic compounds and α-tocopherols that could be the contributors to such an increase of the OSI. Two methods were conducted to assay the active ingredients released from microalgae: one employed three solvent systems to extract the microalgae and the other was the soybean oil added with microalgae. Analyses of free radical scavenging and reducing power suggested that the phenolic compounds dominated the antioxidation activities in soybean oil when it was infused with the microalgae powder. Our results suggest that N. oculata could potentially be used as an additive in cooking oil to increase the shelf life and nutritional value of the oil and to reduce the production of free radicals from lipid oxidation when the oil is used at high-temperature cooking processes.

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Acknowledgments

This study was supported by the Council of Agriculture (97AS-3.1.3-AI-A2), Taiwan, Republic of China. We are very grateful to Dr. Pei-Lan Tsou of Grand Valley State University for her valuable suggestions to the manuscript.

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Authors and Affiliations

  1. Biotechnology Division, Taiwan Agricultural Research Institute, 41362 Wufeng District, Taichung, Taiwan, Republic of China

    Ya-Lin Lee & Yao-Chun Chuang

  2. Tungkang Biotechnology Research Center, Fisheries Research Institute, Donggang, 92845, Pingtung, Taiwan, Republic of China

    Huei-Meei Su

  3. Department of Biology, Virginia Commonwealth University, Richmond, VA, 842012, USA

    Fang-Sheng Wu

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  1. Ya-Lin Lee
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  2. Yao-Chun Chuang
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  3. Huei-Meei Su
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Correspondence to Ya-Lin Lee or Fang-Sheng Wu.

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Lee, YL., Chuang, YC., Su, HM. et al. Freeze-dried microalgae of Nannochloropsis oculata improve soybean oil's oxidative stability. Appl Microbiol Biotechnol 97, 9675–9683 (2013). https://doi.org/10.1007/s00253-013-5183-4

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