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LED Lights Influenced Phytochemical Contents and Biological Activities in Kale (Brassica oleracea L. var. acephala) Microgreens

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Author(s)
Seom LeeChang Ha ParkJin Kyung KimKyungmin AhnHaejin KwonJae Kwang KimSang Un ParkHyeon Ji Yeo
Keimyung Author(s)
Kim, Jin Kyung
Department
Dept. of Microbiology (미생물학)
Journal Title
Antioxidants (Basel)
Issued Date
2023
Volume
12
Issue
9
Keyword
LED lightsantibacterial effectantioxidant effectcarotenoidglucosinolatekale microgreensphenolics
Abstract
Light-emitting diodes (LEDs) are regarded as an effective artificial light source for producing sprouts, microgreens, and baby leaves. Thus, this study aimed to investigate the influence of different LED lights (white, red, and blue) on the biosynthesis of secondary metabolites (glucosinolates, carotenoids, and phenolics) and the biological effects on kale microgreens. Microgreens irradiated with white LEDs showed higher levels of carotenoids, including lutein, 13-cis-β-carotene, α-carotene, β-carotene, and 9-cis-β-carotene, than those irradiated with red or blue LEDs. These findings were consistent with higher expression levels of carotenoid biosynthetic genes (BoPDS and BoZDS) in white-irradiated kale microgreens. Similarly, microgreens irradiated with white and blue LEDs showed slightly higher levels of glucosinolates, including glucoiberin, progoitrin, sinigrin, and glucobrassicanapin, than those irradiated with red LEDs. These results agree with the high expression levels of BoMYB28-2, BoMYB28-3, and BoMYB29 in white- and blue-irradiated kale microgreens. In contrast, kale microgreens irradiated with blue LEDs contained higher levels of phenolic compounds (gallic acid, catechin, ferulic acid, sinapic acid, and quercetin). According to the total phenolic content (TPC) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) inhibition assays, the extracts of kale microgreens irradiated with blue LEDs had slightly higher antioxidant activities, and the DPPH inhibition percentage had a positive correlation with TPC in the microgreens. Furthermore, the extracts of kale microgreens irradiated with blue LEDs exhibited stronger antibacterial properties against normal pathogens and multidrug-resistant pathogens than those irradiated with white and red LEDs. These results indicate that white-LED lights are suitable for carotenoid production, whereas blue-LED lights are efficient in increasing the accumulation of phenolics and their biological activities in kale microgreens.
Keimyung Author(s)(Kor)
김진경
Publisher
School of Medicine (의과대학)
Type
Article
ISSN
2076-3921
Source
https://www.mdpi.com/2076-3921/12/9/1686
DOI
10.3390/antiox12091686
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/45173
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Microbiology (미생물학)
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