Spruce bark extract as a sun protection agent in sunscreens

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Dou, Jinze
dc.contributor.advisor Kesari, Kavindra
dc.contributor.author Sui, Mengmeng
dc.date.accessioned 2018-09-03T12:40:46Z
dc.date.available 2018-09-03T12:40:46Z
dc.date.issued 2018-08-28
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/33742
dc.description.abstract This study aimed to clarify the feasibility of utilizing spruce inner bark extract as a sun protection agent in sunscreens. Ultrasound-assisted extraction with 60 v-% ethanol was applied to isolate the extract in 25-30 % yield, that was almost independent of the temperature (45-75 oC) and time (5-60 min) of the treatment. However, the yield of stilbene glucosides, measured by UV absorption spectroscopy, was highest after ca. 20 min extraction. Nuclear magnetic resonance spectroscopy of the extract showed that it consisted mainly of three stilbene glucosides, astringin, isorhapontin and polydatin (piceid). The maximum overall yield of the stilbene glucosides was > 20 %. Extraction with water gave a much lower yield of the stilbene glucosides. Sunscreens composed of a mixture of vegetable oils, surfactants (fatty acids), glycerin, water and the bark extract were prepared with the low-energy emulsification method. The performance of the sunscreens was assessed by spreading them on a photosensitive paper and observing the change in color during exposure to light. Commercial sunscreens with known SPF values (15-50) were used as references. Addition of 2-5 % of the bark extract in the sunscreen provided similar protection against UV light compared to the commercial products. Use of the spruce inner bark extract as the sun protection agent in sunscreens appeared to be potentially feasible and should be studied further. en
dc.format.extent 49+7
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Spruce bark extract as a sun protection agent in sunscreens en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.subject.keyword spruce bark en
dc.subject.keyword stilbenes en
dc.subject.keyword ultrasound-assisted extraction en
dc.subject.keyword UV-Vis en
dc.subject.keyword NMR en
dc.identifier.urn URN:NBN:fi:aalto-201809034867
dc.programme.major Chemical and Process Engineering fi
dc.programme.mcode CHEM3043 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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