Evaluation of Antioxidant Activities of Water Extract from Microwave Torrefied Oak Wood

Nam, Jeong Bin; Oh, Geun Hye; Yang, Seung Min

doi:10.5658/wood.2018.46.2.178

Cited by 11 publications

(3 citation statements)

References 45 publications

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“…Plants contain a wide variety of constituent compounds, many of which exhibit antibacterial (Ham et al, 2020), antifungal (Adfa et al, 2020;Jang et al, 2012;Lee et al, 2021;Yoon and Kim, 2023), anti-inflammatory (Myeong et al, 2023;Yang et al, 2019), and antioxidant effects (Lee et al, 2021;Nam et al, 2018;Yang et al, 2022). Coicis Semen, the seeds of the Coix lacryma-jobi plant, is a traditional medicinal herb commonly used in East Asian countries such as China, Japan, and Korea.…”

Section: Introductionmentioning

confidence: 99%

Coicis Semen Reduces Staphylococcus aureus Persister Cell Formation by Increasing Membrane Permeability

KIM,

KIM

2024

J. Korean Wood Sci. Technol.

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Unlike resistant cells, persister cells resist antibiotics due to a decreased cellular metabolic rate and can transition back to normal susceptible cells when the antibiotic is removed. These persister cells contribute to the chronic symptoms of infectious diseases and promote the emergence of resistant strains with continuous antibiotic exposure. Therefore, eliminating persister cells represents a promising approach to significantly enhance antibiotic efficacy. Here, we found that Coicis Semen extract reduced Staphylococcus aureus persister cells at a concentration of 0.5 g/L. Linoleic acid and oleic acid, the major components of Coicis Semen extract, exhibited a comparable reduction in persister cells when combined with three antibiotics: ciprofloxacin, oxacillin, and tobramycin. Conversely, these effects were nullified in the presence of the surfactant Tween 80 (1%), suggesting that the hydrophobic characteristics of linoleic acid and oleic acids play a pivotal role in reducing the number of S. aureus persister cells. Considering the concentration-dependent effects of linoleic acid and oleic acid, the persister-reducing activity of Coicis Semen extract was primarily attributed to these fatty acids. Moreover, Coicis Semen extract, linoleic acid, and oleic acid increased the cell membrane permeability of S. aureus. Interestingly, this effect was counteracted by 1% Tween 80, indicating a close association between the reduction of persister cells and the increase in cell membrane permeability. The identified compounds could thus be used to eliminate persister cells, thereby enhancing therapeutic efficacy and shortening treatment duration. When used in conjunction with antibiotics, they may also mitigate chronic symptoms and significantly reduce the emergence of antibiotic-resistant bacteria.

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Section: Introductionmentioning

confidence: 99%

Coicis Semen Reduces Staphylococcus aureus Persister Cell Formation by Increasing Membrane Permeability

KIM,

KIM

2024

J. Korean Wood Sci. Technol.

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“…Free radicals are highly unstable chemical species with an unpaired electron in their outermost shell [ 1 ]. They are essential in many biological processes; at low to moderate amounts, free radicals regulate and maintain homeostasis [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…Synthetic antioxidants such as butylated hydroxytoluene and butylated hydroxyanisole (BHA) are currently predominantly used because of their high stability, efficacy and availability [ 6 ]. However, they have been reported to be costly and to have undesirable side effects [ 1 ]. Therefore, health concerns and high costs of synthetic antioxidants have sparked an interest in natural antioxidants, particularly those of plant origin [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Chemical Profile, Antioxidant and Antibacterial Activities, Mechanisms of Action of the Leaf Extract of Aloe arborescens Mill

Maliehe

Nqotheni

Shandu

et al. 2023

Plants

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Aloe arborescens Mill’s extracts have been explored for antibacterial and antioxidant efficacies. However, there is limited information on its chemical composition and mechanism of action. The purpose of this study was to assess the chemical composition, antibacterial and antioxidant activities and mechanism of the whole leaf extract of A. arborescens Mill. The phytochemical profile was analysed with gas chromatography mass spectrometry (GC-MS). The antioxidant and antibacterial activities were screened using 1,1diphenyl2picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) and micro-dilution assays, respectively. The effects of the extract on the bacterial respiratory chain dehydrogenase, membrane integrity and permeability were analysed using iodonitrotetrazolium chloride, 260 absorbing materials and relative electrical conductivity assays. GC-MS spectrum revealed 26 compounds with N,N’-trimethyleneurea (10.56%), xanthine (8.57%) and 4-hexyl-1-(7-ethoxycarbonylheptyl)bicyclo[4.4.0]deca-2,5,7-triene (7.10%), being the major components. The extract also exhibited antioxidant activity with median concentration (IC50) values of 0.65 mg/mL on DPPH and 0.052 mg/mL on ABTS. The extract exhibited minimum inhibitory concentration (MIC) values ranging from 0.07 to 1.13 mg/mL. The extract inhibited the bacterial growth by destructing the activity of the respiratory chain dehydrogenase, membrane integrity and permeability. Therefore, the leaf extract has the potential to serve as a source of antibacterial and antioxidant compounds.

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Determination of Growth Performance, Viscera Organ Weights and Ileal Intestinal Architecture of Broilers in Response to Drinking Water Added Extractions from Wooden Chips for the Starter Period

Macelline¹,

Wickramasuriya²,

Shin³

et al. 2018

Korean J. Poult. Sci.

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A total of 90 one-day-old male broilers (Ross 308) were randomly assigned to one of the three dietary treatments, each consisting of six replicates (5 broilers/cage). The dietary treatments were 1) control (CON: fresh clean water with no supplement); 2) low dose [LD: CON + 1.56% extractions from the wooden chips (EWC)] and 3) high dose (HD: CON + 12.5% EWC). Drinking water supplemented with EWC was provided using specifically designed individual nipple drinker units. Average daily water intake (ADWI), average daily gain (ADG), average daily feed intake (ADFI), and feed conversion ratio (FCR) were measured weekly for 21 days. One broiler from each cage was euthanized for measuring the visceral organ weights and collecting ileal tissue samples for ileal architecture analysis on day 21. Broilers assigned to the LD and HD watery groups showed higher ADWI than that in broilers consumed CON on day 7 (P<0.05). The broilers subjected to HD treatment showed a deeper crypt depth (P<0.05) than that in broilers subjected to LD and CON on day 21. Therefore, broilers consumed HD showed a lower (P<0.05) villus height:crypt depth ratio than that broilers consumed CON on day 21. Broilers provided drinking water containing any of the tested concentrations of EWC showed no effect (P > 0.05) on growth performance, ileal villus height, and visceral organ weights as compared with those in the CON from hatch to 21 days. In conclusion, broilers fed HD showed reduction in villus height:crypt depth ratio without impairing growth performance and visceral organ weights for the experimental period.

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Evaluation of Antioxidant Activities of Water Extract from Microwave Torrefied Oak Wood

Cited by 11 publications

References 45 publications

Coicis Semen Reduces Staphylococcus aureus Persister Cell Formation by Increasing Membrane Permeability

Coicis Semen Reduces Staphylococcus aureus Persister Cell Formation by Increasing Membrane Permeability

Chemical Profile, Antioxidant and Antibacterial Activities, Mechanisms of Action of the Leaf Extract of Aloe arborescens Mill

Determination of Growth Performance, Viscera Organ Weights and Ileal Intestinal Architecture of Broilers in Response to Drinking Water Added Extractions from Wooden Chips for the Starter Period

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