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Gewählte Doctoral Thesis:

Sharifah Nabihah Syed Jaafar (2013): Utilization of biomass in biorefinery approaches.
Doctoral Thesis - Abteilung für Chemie nachwachsender Rohstoffe, BOKU-Universität für Bodenkultur, pp 98. UB BOKU obvsg

Data Source: ZID Abstracts
Empty fruit bunches (EFB), a residue generated during palm oil extraction processes, was used as the raw material for the isolation of cellulose, lignin, hemicelluloses and fatty acids. The fractionation by supercritical carbon dioxide assisted Organosolv pulping was studied. All fractions were characterized with Fourier transform infrared (FT-IR) spectroscopy, gel permeation chromatography (GPC), pyrolysis-gas chromatography-mass spectroscopy (py-GC-MS) and the Klason lignin method. Characteristic functional groups of the expected major components were monitored by FT-IR. This pulping method produced a lignin that contained relatively high amounts of phenolic hydroxyl groups and oxidized groups. The cellulose molecular weight distribution (MWD) was broad with a trimodal shape similar to sulphite pulps. FT-IR indicated acetyl, uronic ester groups and β-glycosidic linkages in the hemicellulose fraction. The major fatty acid obtained were hexadecanoic and cis-oleic acid while cis,cis-linoleic and octadecanoic acid were the minor compounds. Another focus of this study was the isolation and characterisation of anthocyanins from wheat, which are valuable minor components with antioxidative properties. They have been shown to exert beneficial health effects with regard to preventing oxidative damage, detoxifying enzymes and stimulating the immune system. In order to increase and vary the anthocyanin content of coloured wheat, seven parent grains were hybridized. The hybrid grains were visually classified into six groups – white, red, blue, light purple, purple and dark purple. For anthocyanin isolation, Accelerated Solvent Extraction (ASE), which uses solvents under elevated temperature and pressure to increase extraction efficiency, was used. The extracts revealed distinctly different patterns in pigment composition according to a statistical evaluation of HPLC-UV/Vis data. A set of seven reference samples was selected to reclassify the hybrids following the extended pattern of red, blue, light purple, purple, dark purple with the addition of two new classes. The anthocyanin patterns were shown to follow the parentage and crossbreeds with high total anthocyanin content contained the anthocyanins of both the blue and purple patterns.

Betreuer: Rosenau Thomas
1. Berater: Potthast Antje
2. Berater: Liebner Falk

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