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ANTIOXIDANT PROPERTIES OF HIBISCUS: SPECIES VARIATION, ALTITUDINAL CHANGE, COASTAL INFLUENCE AND FLORAL COLOUR CHANGE

SK Wong, YY Lim and EWC Chan
Journal of Tropical Forest Science
Vol. 21, No. 4 (October 2009), pp. 307-315
Stable URL: http://www.jstor.org/stable/23616755
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
ANTIOXIDANT PROPERTIES OF HIBISCUS: SPECIES VARIATION, ALTITUDINAL CHANGE, COASTAL INFLUENCE AND FLORAL COLOUR CHANGE
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Abstract

Antioxidant properties (AOP) of leaves and flowers of six Hibiscus species were screened. For leaves of Hibiscus rosa-sinensis and Hibiscus tiliaceus, the effects of altitudinal change and coastal influence respectively were assessed. Flowers of Hibiscus mutabilis, during colour change, were analysed. AOP evaluated were total phenolic content (TPC), total anthocyanin content (TAC), radical-scavenging activity expressed as ascorbic acid equivalent antioxidant capacity (AEAC), ferric-reducing power (FRP) and ferrous ion-chelating (FIC) ability. TPC, AEAC and FRP of leaves and flowers of H. tiliaceus were the greatest. The red flowers of H. rosa-sinensis and Hibiscus schizopetalus yielded the highest TAC and FIC ability. The AOP of leaves of highland populations of H. rosa-sinensis were greater than those of lowland. There was no distinct variation in AOP of leaves of inland and coastal populations of H. tiliaceus. The AOP of red flowers of H. mutabilis were greater than those of pink and/or white flowers. Overall ranking of flowers during colour change was red > pink > white. Ciri antioksida (AOP) daun dan bunga enam spesies Hibiscus dikaji. Bagi daun Hibiscus rosa-sinensis dan Hibiscus tiliaceus, kesan perubahan altitud dan pengaruh pesisiran pantai masing-masing dinilai. Pertukaran warna bunga Hibiscus mutabilis dianalisis. AOP yang dikaji ialah jumlah kandungan fenol (TPC), jumlah kandungan antosianin (TAC), aktiviti menyerang radikal yang dinyatakan sebagai kebolehan antioksida asid askorbik (AEAC), kuasa menurun ferik (FRP) dan pengkelatan ion ferum (FIC). Nilai-nilai TPC, AEAC dan FRP paling tinggi bagi daun dan bunga H. tiliaceus. Bunga merah H. rosa-sinensis dan Hibiscus schizopetalus menunjukkan nilai TAC dan FIC tertinggi. AOP daun H. rosa-sinensis bagi populasi gunung lebih tinggi daripada populasi tanah pamah. Tidak ada perbezaan dalam AOP daun populasi H. tiliaceus yang jauh dari pantai dengan populasi pesisiran pantai. AOP bunga merah H. mutabilis lebih tinggi daripada bunga merah muda dan/atau putih. Secara amnya, nilai AOP bunga ketika pertukaran warna ialah merah > merah muda > putih.

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