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Molecules 2018, 23(7), 1772;

Analysis of the Active Constituents and Evaluation of the Biological Effects of Quercus acuta Thunb. (Fagaceae) Extracts

Department of Pharmacy, College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Muan, Jeonnam 58554, Korea
Department of Nursing, Dongshin University, Naju, Jeonnam 58245, Korea
Department of Environmental Engineering, Mokpo National University, Muan, Jeonnam 58554, Korea
Department of Manufacturing Pharmacy, College of Pharmacy, Pusan National University, Geumjeong, Busan 46241, Korea
Jeonnam Forest Resurce research Institue, Naju, Jeonnam 58213, Korea
Jeollanamdo Wando Arboretum, Wando, Jeonnam 59105, Korea
Department of Pharmacy, College of Pharmacy, Chonnam National University, Gwangju 61186, Korea
Department of Pharmaceutical Engineering, Dongshin University, Naju, Jeonnam 58245, Korea
College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Korea
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Received: 2 July 2018 / Revised: 15 July 2018 / Accepted: 17 July 2018 / Published: 19 July 2018
(This article belongs to the Special Issue Qualitative and Quantitative Analysis of Bioactive Natural Products)
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We evaluated the antioxidant and antibacterial activity of hexnane, ethyl acetate, acetone, methanol, ethanol, and water extracts of the Quercus acuta leaf. The antioxidant properties were evaluated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity, reducing power, and total phenolic content. Antibacterial activity was assessed against general infectious pathogens, including antibiotic-resistant clinical isolates. The methanolic extract showed the highest DPPH radical scavenging activity and total phenolic content, while the reducing power was the highest in the water extract. The ethyl acetate extract showed the best antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA) strains. Additionally, it displayed antibacterial activity against Staphylococcus aureus KCTC1928, Micrococcus luteus ATCC 9341, Salmonella typhimurium KCTC 1925, Escherichia coli KCTC 1923, and eight MRSA strains. These results present basic information for the possible uses of the ethanolic and ethyl acetate extracts from Q. acuta leaf in the treatment of diseases that are caused by oxidative imbalance and antibiotic-resistant bacterial infections. Six active compounds, including vitamin E, which are known to possess antioxidant and antibacterial activity, were identified from the extracts. To the best of our knowledge, this is the first study that reports the chemical profiling and antibacterial effects of the various QA leaf extracts, suggesting their potential use in food therapy or alternative medicine. View Full-Text
Keywords: Quercus acuta leaf; antioxidant; antibacterial activity; Staphylococcus aureus Quercus acuta leaf; antioxidant; antibacterial activity; Staphylococcus aureus

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Kim, M.-H.; Park, D.-H.; Bae, M.-S.; Song, S.-H.; Seo, H.-J.; Han, D.-G.; Oh, D.-S.; Jung, S.-T.; Cho, Y.-C.; Park, K.-M.; Bae, C.-S.; Yoon, I.-S.; Cho, S.-S. Analysis of the Active Constituents and Evaluation of the Biological Effects of Quercus acuta Thunb. (Fagaceae) Extracts. Molecules 2018, 23, 1772.

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