Abstract
The residual oil recovered from palm-pressed fiber is known to contain high level of carotenes (4,000 mg kgˉ1 to 6,000 mg kgˉ1) and vitamin E such as tocopherols and tocotrienols (2,000 mg kgˉ1 to 3,000 mg kgˉ1). In this study, the water-soluble compounds in fresh palm-pressed fiber were recovered by supercritical carbon dioxide (SC-CO2) extraction. The concentration of these compounds in palm-pressed fiber oil recovered was determined in the range of 1,000 mg kgˉ1 to 2,000 mg kgˉ1. A total of 12 compounds have been identified from this water-soluble extract with molecular weights ranging from 126 amu. to 208 amu.. Preliminary results showed that these water-soluble compounds possess superior antioxidant properties screening using FRAP (Ferric Reducing Ability of Plasma) and TEAC (Trolox Equivalent Antioxidant Capacity) assays.
Highlights
Plant phenolics form an extensive group of compounds, which prevent oxidation of lipids and may have beneficial effects on human health
Recent evidence suggested that phenolics may play an important role in the regulation of plant metabolism[11]
Fresh palm-pressed fiber was collected from MPOB Palm Oil Mill Technology Center, Negeri Sembilan, Malaysia
Summary
Plant phenolics form an extensive group of compounds, which prevent oxidation of lipids and may have beneficial effects on human health. These phenolic compounds occur naturally in plant sources such as olive oil[1,2], tea and fruits[3], rice bran[4], oat groats and hulls[5] and herbs[6]. They appear to have desirable medicinal properties. Investigation was carried out to study the existence of water-soluble compounds especially the phenolics content in the by-products from the palm oil mill, which have direct contact with the process water
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