Antioxidant activity of extracts from the wood and bark of Port Orford cedar

Gao, Heng; Shupe, Todd F.; Eberhardt, Thomas L.; Hse, Chung Y.

doi:10.1007/s10086-006-0850-z

Cited by 46 publications

(25 citation statements)

References 24 publications

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“…Bacosides from Bacopamonnieri also showed excellent free radical scavenging activity by ABTS assay [15]. The ABTS assayis based on the antioxidant capacity of the samples to prevent the oxidation of ABTS to ABTS++ radicalcation [16]. Our results are similar with the methanolic extract of both leaves and rhizome of Curcuma amada, which exhibited the maximum scavenging activity of DPPH and ABTS [17].…”

Section: Discussionsupporting

confidence: 79%

Comparison of Three Herbal Plants for Best Free Radical Scavenging Activity

Palaniswamy¹,

Padma

2017

Int J Curr Pharm Sci

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BSTRACTObjective: Excessive production of reactive oxygen species leads to oxidative stress. Antioxidants can prevent or retard the oxidation caused by free radicals and sufficient intake of antioxidants is supposed to protect against diseases. Candidate play Methods:The leaf extracts of these plants were exposed to a battery of free radical scavenging assays like DPPH, ABTS, hydrogen peroxide, superoxide and nitric oxide to determine the free radical scavenging activity.Results: It was observed that the Majoranahortensis leaves in methanolic extract showed maximum scavenging activity. Conclusion:Several plants with free radical scavenging activity have been identified, where Majoranahortensis is one such leave.

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Section: Discussionsupporting

confidence: 79%

Comparison of Three Herbal Plants for Best Free Radical Scavenging Activity

Palaniswamy¹,

Padma

2017

Int J Curr Pharm Sci

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“…Both oils were tested up to their solubility concentration (5.0 mg/L); therefore, our study demonstrates that these compounds have little environmental toxicity as evaluated under testing procedures specified for the Toxic Substances Control Act, section 5(e) for the environmental exposure criterion. Previous toxicity studies of these and other essential oil extracts have mainly focused on actually utilizing the antibacterial and insecticidal properties of the chemical components in these oils to human benefit (Hammer et al 1999;Johnston et al 2001;Filipowicz et al 2003;Cavaleiro et al 2006;Keeling and Bohlmann 2006;Dolan et al 2007;Gao et al 2007) and have not analyzed for the toxic effects they might exhibit to aquatic environments where manufacturing waste is deposited. Indeed, this presents a need for research, as these natural products components are not regulated by any specific governing body such as the FDA or USDA.…”

Section: Resultsmentioning

confidence: 99%

Acute aquatic toxicity of western juniper (Juniperus occidentalis) foliage and Port Orford cedar (Chamaecyparis lawsoniana) heartwood oils

Duringer

Swan²,

Walker³

et al. 2009

Environ Monit Assess

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Recently, interest has developed for using essential oils from Western juniper (Juniperus occidentalis) foliage and Port Orford cedar (Chamaecyparis lawsoniana) heartwood in commercial products such as pest repellents and cosmetics. In order to gauge the relative toxicological risk that these oils pose to freshwater and marine organisms, the acute aquatic toxicity of these oils was evaluated using OPPTS guidelines to the cladoceran Daphnia magna, the rainbow trout Oncorhynchus mykiss and the green alga Selenastrum capricornutum. For western juniper foliage oil, no toxicity was exhibited toward D. magna or O. mykiss, even at 5.0 mg/L (the highest concentration tested and limit of solubility). For toxicity to S. capricornutum using algal cell density, the 72 and 96 h EC50 value was 1.7 mg/L and the no observable effect concentration (NOEC) was 0.63 mg/L. For Port Orford cedar heartwood oil, no toxicity was exhibited toward O. mykiss or S. capricornutum, even at 5.0 mg/L (the highest concentration tested and limit of solubility). The 48-h D. magna EC50 value was 1.9 mg/L; the NOEC values for algal cell density were 1.25 mg/L (72 h) and 0.63 mg/L (96 h). In summary, this study shows that western juniper foliage and Port Orford cedar heartwood oils demonstrate little to no risk to aquatic organisms.

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“…The standard steamed liquor was diluted 5, 25, 125 or 625 times with water, and the diluted solutions were used to examine the antioxidative activity by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) free-radical scavenging assay. 15,16) Fractionation of extracts from the steamed used tea leaves. By the same procedure as that just described, the tea leaf meal (1.0 g) and 50 ml of water were heated for 20 min in the oil bath preheated to 100, 120, 140, 160, 180 or 200 C. After steaming, each filtrate was collected, concentrated under reduced pressure, and freeze-dried to obtain a crude extract.…”

Section: H-andmentioning

confidence: 99%

“…The yields and antioxidative activities of HE100-200 C, EA100-200 C and WS100-200 C were then respectively measured by the gravimetric method and the DPPH free-radical scavenging assay. 15,16) Isolation of antioxidants from the steamed used tea leaves. The tea leaf meal (1.0 g) and 50 ml of water were heated for 20 min in an oil bath preheated to 200 C. After steaming, the reaction mixture was filtered to obtain the filtrate.…”

Section: H-andmentioning

confidence: 99%

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Antioxidants from Steamed Used Tea Leaves and Their Reaction Behavior

Nomizu

Hashida

Makino

et al. 2008

Bioscience, Biotechnology, and Biochemistry

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The most efficient steaming conditions below 200 C for extracting antioxidants from used tea leaves and their reaction behavior during the steaming treatment were investigated. The antioxidative activity of the steamed extracts increased with increasing steaming temperature, and the yield of the ethyl acetate extract fraction from each steamed extract showing the greatest antioxidative activity also increased. Caffeine, (À)-catechin, (À)-epicatechin, (À)-gallocatechin, (À)-epigallocatechin, (À)-catechin gallate, (À)-epicatechin gallate, (À)-gallocatechin gallate, (À)-epigallocatechin gallate and gallic acid were identified from the ethyl acetate extract fraction. Quantitative analyses demonstrated that the catechins with a 2,3-cis configuration decreased with increasing steaming temperature, whereas the corresponding epimers at the C-2 position increased. Each pair of epimers showed similar antioxidative activity to each other, indicating that the epimerization reaction did not contribute to the improved antioxidative activity. It is concluded from these results that the improvement in antioxidative activity at higher steaming temperatures was due to the increased yield of catechins and other antioxidants.

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Antioxidant activity of extracts from the wood and bark of Port Orford cedar

Cited by 46 publications

References 24 publications

Comparison of Three Herbal Plants for Best Free Radical Scavenging Activity

Comparison of Three Herbal Plants for Best Free Radical Scavenging Activity

Acute aquatic toxicity of western juniper (Juniperus occidentalis) foliage and Port Orford cedar (Chamaecyparis lawsoniana) heartwood oils

Antioxidants from Steamed Used Tea Leaves and Their Reaction Behavior

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