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Photo-fermentation of purple sweet potato (Ipomoea batatas L.) using probiotic bacteria and LED lights to yield functionalized bioactive compounds

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Abstract

The purpose of this study was to examine if fermentation of purple sweet potato (Ipomoea batatas L.) powder (PSP) by Lactobacillus brevis under green, red, blue, white light-emitting diode (LED) illumination or sunlight might yield functionalized products with good antibacterial, antioxidant activity, and/or cytotoxic activity. The Purple sweet potato (PSP) powder fermented with probiotic bacteria L. brevis under white LED light (1.9 ± 1.80/1.6 ± 0.52), blue LED light (1.4 ± 1.32/1.8 ± 0.83), or sunlight (1.2 ± 1.26/1.5 ± 1.83) for Propionibacterium acne and Staphylococcus epidermidis displayed good to moderate antibacterial activity based on minimum inhibitory concentration (MIC) red, blue, white LED lights and sunlight (80 µg/mL) for P. acne and S. epidermidis, minimum bactericidal concentration red, blue LED lights and sunlight shows (46/48, 61/70, 50/48 µg/mL) for P. acne and S. epidermidis. Antioxidant activity for dark, white, blue and green LED lights for ABTS and white, blue and green Led for DPPH assay resulted in lower activity. Fourier transform infrared spectroscopy was performed to determine the functional groups in the non-fermented (control) and fermented products of PSP powders obtained using different light sources. Sunlight, white, and blue LED light-fermented extracts contained alcohol, acid, and phenol groups, as well as aliphatic amines. The results of this study clearly indicate that fermentation of purple sweet potato with probiotic bacteria under various LED light sources can yield compounds that can be used in cosmetic and value-added food products.

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Acknowledgements

This works was supported by Korea Institute for Ministry of SMEs and Startup (MSS) through the Industrial Cooperative R&D Program (R0006163). This research was also supported by “Research Base Construction Fund Support Program” funded by Chonbuk National University in 2018.

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Authors and Affiliations

  1. Sunchang Reserch Institute of Health and Longevity, Sunchang, Jeonbuk, 56015, South Korea

    Joeng-Ho Lee

  2. Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk, 54596, South Korea

    Palanivel Velmurugan, Jung-Hee Park & Byung-Taek Oh

  3. Department of Microbiology, Sri Sankara Arts and Science College, Enathur, Kanchipuram, Tamil Nadu, 631561, India

    Palanivel Velmurugan

  4. Department of Biology, University of Texas-Arlington, Arlington, TX, 76019, USA

    Woo-Suk Chang

  5. Department of Ecology Landscape Architecture-Design, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk, 54596, South Korea

    Yool-Jin Park

  6. Plant Medical Research Center, College of Agricultural and Life Sciences, Chonbuk National University, Jenoju, Jeonbuk, 54896, South Korea

    Byung-Taek Oh

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  1. Joeng-Ho Lee
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  2. Palanivel Velmurugan
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Correspondence to Byung-Taek Oh.

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Lee, JH., Velmurugan, P., Park, JH. et al. Photo-fermentation of purple sweet potato (Ipomoea batatas L.) using probiotic bacteria and LED lights to yield functionalized bioactive compounds. 3 Biotech 8, 300 (2018). https://doi.org/10.1007/s13205-018-1327-7

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