Antioxidant And Antifungal Activities Of Some Malaysian Commercial Timbers
Aktiviti antioksidan dan antikulat sebelas spesies kayu keras dagangan Malaysia daripada tujuh keluarga berlainan telah dikaji. Ekstrak metanol bahagian kulit, kayu teras dan kayu gubal daripada setiap spesies telah diuji menggunakan 1,1’-difenil-2- pikrilhidrazil (DPPH) untuk penentuan aktiviti...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://eprints.usm.my/41501/1/Amalia_Binti_Mahamud24.pdf http://eprints.usm.my/41501/ |
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| Summary: | Aktiviti antioksidan dan antikulat sebelas spesies kayu keras dagangan Malaysia
daripada tujuh keluarga berlainan telah dikaji. Ekstrak metanol bahagian kulit, kayu teras
dan kayu gubal daripada setiap spesies telah diuji menggunakan 1,1’-difenil-2-
pikrilhidrazil (DPPH) untuk penentuan aktiviti antioksidan. Kandungan fenolik pula telah
dinilai dengan menggunakan kaedah Folin-Ciocalteau. Ekstrak yang diuji daripada
bahagian kulit Angsana, kulit dan kayu gubal Keruing latek, ketiga-tiga bahagian
Kekatong, merpauh periang, kulit dan kayu gubal Bintangor bukit, dan kulit Sentul telah
menunjukkan aktiviti antioksidan. Bahagian kulit Bintangor bukit telah dipecahkan lebih
lanjut oleh kaedah kromatografi iaitu kolum kromatografi (CC) dan cecair-cecair
(pembahagian) kromatografi (LLC). Catechol di samping beberapa sebatian lain seperti
fenol, syringol, guaiacol dan 4-metilcatechol, telah dikenal pasti oleh pirolisis gas
kromatogram jisim spektrometer (Py-GC/MS) sebagai sebatian yang paling penting bagi
bahagian kulit Bintangor bukit untuk menyingkirkan radikal bebas.
Antioxidant and antifungal activities of eleven hardwood species of Malaysian
commercial timbers from seven families were studied. Methanolic extracts from bark,
heartwood and sapwood of each species were subjected to 1,1’-diphenyl-2-picrylhydrazyl
(DPPH) for the antioxidant activity determination. Total phenolics were evaluated using
the Folin-Ciocalteau method. The tested extracts of Angsana bark, Keruing latek bark and
sapwood, all three parts of Kekatong, Merpauh periang bark, Bintangor bukit bark and
sapwood, and Sentul bark did showed antioxidant activity. Bintangor bukit bark was
further fractionated by column chromatography (CC) and liquid-liquid (partition)
chromatography (LLC). Catechol with a few other compounds such as phenol, syringol,
guaiacol and 4-methylcatechol were detected by pyrolysis gas chromatography mass
spectrometry (Py-GC/MS) as the most important compounds responsible for Bintangor
bukit bark to scavenge the free radicals. |
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