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- Co, Michelle, 1975-, et al.
(författare)
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Extraction of Antioxidants from Spruce (Picea abies) Bark using Eco-Friendly Solvents
- 2012
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Ingår i: Phytochemical Analysis. - : Wiley-Blackwell. - 0958-0344 .- 1099-1565. ; 23:1, s. 1-11
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Tidskriftsartikel (refereegranskat)abstract
- Introduction-Antioxidants are known to avert oxidation processes and they are found in trees and other plant materials. Tree bark is a major waste product from paper pulp industries; hence it is worthwhile to develop an extraction technique to extract the antioxidants.Objective- To develop a fast and environmentally sustainable extraction technique for the extraction of antioxidants from bark of spruce (Picea abies) and also to identify the extracted antioxidants that are abundant in spruce bark.Methodology- A screening experiment that involved three different techniques, was conducted to determine the best technique to extract antioxidants.The antioxidant capacity of the extracts was determined with DPPH (2,2-diphenyl-2’-picrylhydrazyl) assay. Pressurised fluid extraction (PFE) turned out to be the best technique and a response surface design was therefore utilised to optimise PFE. Furthermore, NMR and HPLC-DAD-MS/MS were applied to identify the extracted antioxidants.Results- PFE using water and ethanol as solvent at 160 and 180°C, respectively, gave extracts of the highest antioxidant capacity. Stilbene glucosides such as isorhapontin, piceid and astringin were identified in the extracts.Conclusion-The study has shown that PFE is a fast and environmentally sustainable technique, using water and ethanol as solvent for the extraction of antioxidants from spruce bark.
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| 2. |
- Geraldi, Joana G, et al.
(författare)
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Innovation in project management: Voices of researchers
- 2008
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Ingår i: International Journal of Project Management. - : Elsevier BV. - 0263-7863 .- 1873-4634. ; 26:5, s. 586-589
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports and reflects on the discussions about the nature of the discipline of project management that took place during the 8th conference of the International Research Network of Organizing by Projects (IRNOP VIII), held in Brighton in September 2007. The discussions started with the provocative motion “This house believes that we no longer need the discipline of project management”. The arguments are organised in the following areas: the use of the traditional body of knowledge by practitioners and by academics; the use of project management as a knowledge field by practitioners and by academics. The discussions indicate that project management research is in a fruitful moment of revolution of paradigms. We wish that the new paradigm accepts the plurality of research in projects and we need discussions supporting and also refusing the ‘motion’, and by this means, proposing answers, rather than the answer, to the future of ‘the project management discipline’.
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