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, 55 (8), 3174-3180

Antioxidant Effects of Live and Heat-Killed Probiotic Lactobacillus plantarum Ln1 Isolated From Kimchi

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Antioxidant Effects of Live and Heat-Killed Probiotic Lactobacillus plantarum Ln1 Isolated From Kimchi

Hye Ji Jang et al. J Food Sci Technol.

Abstract

The aim of this study was to evaluate the probiotic properties of Lactobacillus plantarum Ln1 isolated from kimchi and the antioxidant activities of live and heat-killed cells. L. plantarum KCTC 3108, which has been used as a commercial probiotic strain, was used as a control. L. plantarum strains (Ln1 and KCTC 3108) can survive under artificial gastric conditions (pH 2.5 in 0.3% pepsin for 3 h and 0.3% oxgall for 24 h), and adhere strongly to HT-29 cells. In addition, L. plantarum Ln1 did not produce carcinogenic β-glucuronidase, whereas it showed a higher β-galactosidase production of 3067.42 mU/mL. The antioxidant activity of L. plantarum Ln1 was assessed using the 2,2-diphenyl-1-picryl-hydrazyl (DPPH) and 2,2'-azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) radical scavenging, β-carotene and linoleic acid inhibition, and reducing power assays. In all these methods, live L. plantarum Ln1 showed a higher antioxidant activity than the control strain. In heat-killed cells of L. plantarum Ln1, β-carotene bleaching inhibitory activity and reducing power was higher than DPPH and ABTS radical scavenging activity. These results suggested that live or heat-killed L. plantarum Ln1 isolated from kimchi might be useful as an antioxidant probiotic.

Keywords: Antioxidant activity; Heat-killed probiotic; Lactobacillus plantarum; Live probiotic; β-Galactosidase activity.

Figures

Fig. 1
Fig. 1
DPPH radical scavenging activity of live and heat-killed cells of L. plantarum Ln1 and KCTC 3108 at 107 CFU/mL. Each value represents mean ± standard deviation (P < 0.05). Filled squares, live cells; opened squares, heat-killed cells
Fig. 2
Fig. 2
ABTS radical scavenging activity of live and heat-killed cells of L. plantarum Ln1 and KCTC 3108 at 107 CFU/mL. Each value represents mean ± standard deviation (P < 0.05). Filled squares, live cells; opened squares, heat-killed cells
Fig. 3
Fig. 3
β-Carotene bleaching inhibitory activity of live and heat-killed cells of L. plantarum Ln1 and KCTC 3108 at 107 CFU/mL. Each value represents mean ± standard deviation (P < 0.05). Filled squares, live cells; opened sqaures, heat-killed cells
Fig. 4
Fig. 4
Reducing power of live and heat-killed cells of L. plantarum Ln1 and KCTC 3108 at 107 CFU/mL. Each value represents mean ± standard deviation (P < 0.05). Filled squares, live cells; opened squares, heat-killed cells

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