Potential and utilization of water extracts from spruce bark

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Dou, Jinze
dc.contributor.advisor Tuominen, Kirsi
dc.contributor.author Multia, Evgen
dc.date.accessioned 2018-06-01T11:33:52Z
dc.date.available 2018-06-01T11:33:52Z
dc.date.issued 2018-05-08
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/31541
dc.description.abstract The aim of this thesis was to investigate potential ways to utilize water extracts from spruce bark. Spruce bark has been found to contain three main stilbene glucosides (astringin, isorhapontin, polydatin), which have potential in the treatment of skin aging and cosmetics applications. Since stilbene glucosides are water soluble, they are dissolved into the debarking process waters of the pulp and paper industry. These waters are not fully utilized at the moment, and being considered as a waste stream, which adds to the costs of the mill by increasing COD levels of the waste water. This waste stream could potentially be transformed to a source of stilbene glucosides, to provide additional revenue to the mill. In the experimental part, temperature effect on hot water extraction yields of industrial spruce bark was studied. Mechanical pressing of heated spruce bark was performed with a laboratory scale mechanical press to study the effect on the COD levels. Finally, bark press waters obtained from the mill were characterized, with partial purification of stilbene glucosides by ultrafiltration with 2 and 5 kDa filters. The yields were calculated by gravimetric and spectroscopic analysis. Two dimensional (2D) solution-state 1H–13C correlation NMR spectroscopy provided the structural verification of the stilbene glucosides and other compounds present in the samples. Extraction yield of industrial spruce bark was increasing 1.4 times every 20 ◦C, on average, reaching yield of 5.0% at 80 ◦C. The mechanical pressing was able to press out 26±5% of the total mass of the sample. COD level was 75,100 mg/L for 80 ◦C sample. This was two times higher compared to bark press sample of taken from a paper mill, which had COD level of 37,500 mg/L. Ultrafiltration could remove 90% of polyphenols and permeated 14% of the stilbenes of the feed. With 2D-HSQC NMR, all three major stilbene glucosides were identified from the filtrate and the feed. en
dc.format.extent 61+12
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Potential and utilization of water extracts from spruce bark en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.subject.keyword bark press waters en
dc.subject.keyword debarking en
dc.subject.keyword hot water extraction en
dc.subject.keyword skin aging en
dc.subject.keyword ultrafiltration en
dc.subject.keyword HSQC en
dc.identifier.urn URN:NBN:fi:aalto-201806012968
dc.programme.major Biomass refining fi
dc.programme.mcode CHEM3021 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Vuorinen, Tapani
dc.programme Master's Programme in Chemical, Biochemical and Materials Engineering fi
dc.location PK fi
local.aalto.electroniconly yes
local.aalto.openaccess yes

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