Extraction and Identification of Water-Soluble Compounds in Palm-Pressed Fiber by SC-CO2 and GC-MS

Abstract

The residual oil recovered from palm-pressed fiber is known to contain high level of carotenes (4,000 mg kg¯1 to 6,000 mg kg¯1) and vitamin E such as tocopherols and tocotrienols (2,000 mg kg¯1 to 3,000 mg kg¯1). In this study, the water-soluble compounds in fresh palm-pressed fiber were recovered by supercritical carbon dioxide (SC-CO 2 ) extraction. The concentration of these compounds in palm-pressed fiber oil recovered was determined in the range of 1,000 mg kg¯1 to 2,000 mg kg¯1. 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.

Assessment techniques of antimicrobial properties of natural compounds of plant origin: current methods and future trends

“…Water-soluble compounds, such as polysaccharides and polypeptides, including fabatin and various lectins, are commonly more effective as inhibitors of pathogen adsorption and have no real impact as antimicrobial agents (Cowan, 1999). Water soluble flavonoids (mostly anthocyanins) have no antimicrobial significance and water soluble phenolics are only important as antioxidant compounds (Yamaji et al, 2005;Nang et al, 2007).…”

Determination of Antioxidants in Oil Palm Leaves (Elaeis guineensis)

“…Attempt to recover these components from palm pressed fiber has been carried out in the past using supercritical fluid extraction (Nang et al, 2007). It is now believed that the water soluble antioxidants are also present in other biomass of the oil palm, namely, the leaves.…”

“…Besides the palm oil mill effluent, the water soluble antioxidants were also retained in the pressed fiber of the oil palm fruits (Nang et al, 2007). Attempt to recover these components from palm pressed fiber has been carried out in the past using supercritical fluid extraction (Nang et al, 2007).…”

Antimicrobial activity of Thymus schimperi Ronninger (Lamiaceae) against standard and clinical isolates of human pathogenic bacteria

“…Nonetheless, organic solvent, such as methanol and ethanol were suggested to be better than water as a solvent for antimicrobial agent extraction (Majhenic et al, 2007;El-Safey et al, 2011). Various reports suggested that water soluble flavonoids are not important as antimicrobial activity, though, water soluble phenolics were found to exhibit antioxidant potential (Nang et al, 2007). The aqueous extract of Leonotis ocymifolia was also found not to inhibit the growth of any bacterial species (Habtamu et al, 2010).…”