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  1. Antioxidant activity of extracts from the bark of Chamaecyparis lawsoniana (A. Murrary) Parl.

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    Author(s): Heng Gao; Todd F. Shupe; Chung Y. Hse; Thomas L. Eberhardt
    Date: 2006
    Source: Holzforschung, Vol. 60: 459-462
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (132 KB)

    Description

    The bark of Chamaecyparis lawsoniana (A. Murray) Parl. was extracted with methanol and sequentially partitioned with n-hexane, ethyl acetate, n-butanol and deionized water. The antioxidant activities of the four extracts were evaluated using the DPPH• and ABTS+• methods. The total phenolic content of the extracts was determined using the Folin-Ciocalteu method and expressed as gallic acid equivalents (GAE). Butylated hydroxytoluene was used as a positive control in the radical-scavenging activity tests. All the bark extracts showed significant radical-scavenging activity. In the ABTS+• assay, n-butanol extracts exhibited the strongest radical-scavenging activity, followed by ethyl acetate, water, and n-hexane extracts. The greatest total phenolic content was 428.54 mg GAE per gram of dry extract and was detected in the n-butanol extract, followed by the ethyl acetate and n-hexane extracts. The antioxidant activities correlate with the amount of phenolics present in these extracts. The ethyl acetate and n-butanol extracts were rich in phenolics and may represent a good source of antioxidants.

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    Citation

    Gao, Heng; Shupe, Todd F.; Hse, Chung Y.; Eberhardt, Thomas L. 2006. Antioxidant activity of extracts from the bark of Chamaecyparis lawsoniana (A. Murrary) Parl. Holzforschung, Vol. 60: 459-462

    Keywords

    antioxidant activity, Folin-Ciocalteu method, free radical scavenger, methanol extracts, Port-Orford cedar, total phenolic content

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