Development of lignin based sunblockers for suncreams

As overexposure to ultraviolet (UV) radiation has detrimental effects to our skins, development of effective sun-cream is essential for protecting our skins against the UV radiation. A promising approach to add-on or further improve the UV protection property of commercial creams will be via incorpo...

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Main Author: Chua, Yun Khim
Other Authors: Tan Lay Poh
Format: Final Year Project
Language:English
Published: 2016
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Online Access:http://hdl.handle.net/10356/66394
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-663942023-03-04T15:34:37Z Development of lignin based sunblockers for suncreams Chua, Yun Khim Tan Lay Poh School of Materials Science and Engineering A*STAR Institute of Material Research and Engineering DRNTU::Engineering::Materials::Functional materials As overexposure to ultraviolet (UV) radiation has detrimental effects to our skins, development of effective sun-cream is essential for protecting our skins against the UV radiation. A promising approach to add-on or further improve the UV protection property of commercial creams will be via incorporation of lignin as it has UV chromophoric groups for UV absorption. Additionally, lignin has aromatic rings of hydroxyl and methoxy groups, providing antioxidant property for reduction of UVinduced skin damages. However, incorporation of raw lignin will reduce shear thinning effect of the creams. Hence, lignin-based grafted copolymers approach was adopted in this project. Moreover, this approach can also enhance the dispersion efficiency of lignin in the commercial creams. Lignin-poly(ethylene glycol) methacrylate (PEGMA) grafted copolymers were synthesised via atom transfer radical polymerisation (ATRP) and characterised by nuclear magnetic resonance (NMR) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. Furthermore, they were blended into commercial creams and characterised by UV-visible spectrophotometer and rheometer. Lignin-PEGMA grafted copolymers demonstrated its ability to improve SPF of commercial creams. Additionally, it can provide antioxidant property. Among the various percentages of lignin-PEGMA grafted copolymer incorporation, and feed ratios of lignin to PEGMA, that had been experimented, 10% lignin-PEGMA500 (0.4g : 2g) grafted copolymer (A1) was deemed to provide the best sun-cream performance, especially in Shiseido SPF15 sun-cream. It had improved the SPF from 15.36 ± 2.44 to 38.53 ± 0.26. In summary, lignin-PEGMA grafted copolymers can potentially be incorporated into commercial creams for greater efficacy in UV protection. Bachelor of Engineering (Materials Engineering) 2016-04-01T03:34:52Z 2016-04-01T03:34:52Z 2016 Final Year Project (FYP) http://hdl.handle.net/10356/66394 en Nanyang Technological University 47 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Materials::Functional materials
spellingShingle DRNTU::Engineering::Materials::Functional materials
Chua, Yun Khim
Development of lignin based sunblockers for suncreams
description As overexposure to ultraviolet (UV) radiation has detrimental effects to our skins, development of effective sun-cream is essential for protecting our skins against the UV radiation. A promising approach to add-on or further improve the UV protection property of commercial creams will be via incorporation of lignin as it has UV chromophoric groups for UV absorption. Additionally, lignin has aromatic rings of hydroxyl and methoxy groups, providing antioxidant property for reduction of UVinduced skin damages. However, incorporation of raw lignin will reduce shear thinning effect of the creams. Hence, lignin-based grafted copolymers approach was adopted in this project. Moreover, this approach can also enhance the dispersion efficiency of lignin in the commercial creams. Lignin-poly(ethylene glycol) methacrylate (PEGMA) grafted copolymers were synthesised via atom transfer radical polymerisation (ATRP) and characterised by nuclear magnetic resonance (NMR) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. Furthermore, they were blended into commercial creams and characterised by UV-visible spectrophotometer and rheometer. Lignin-PEGMA grafted copolymers demonstrated its ability to improve SPF of commercial creams. Additionally, it can provide antioxidant property. Among the various percentages of lignin-PEGMA grafted copolymer incorporation, and feed ratios of lignin to PEGMA, that had been experimented, 10% lignin-PEGMA500 (0.4g : 2g) grafted copolymer (A1) was deemed to provide the best sun-cream performance, especially in Shiseido SPF15 sun-cream. It had improved the SPF from 15.36 ± 2.44 to 38.53 ± 0.26. In summary, lignin-PEGMA grafted copolymers can potentially be incorporated into commercial creams for greater efficacy in UV protection.
author2 Tan Lay Poh
author_facet Tan Lay Poh
Chua, Yun Khim
format Final Year Project
author Chua, Yun Khim
author_sort Chua, Yun Khim
title Development of lignin based sunblockers for suncreams
title_short Development of lignin based sunblockers for suncreams
title_full Development of lignin based sunblockers for suncreams
title_fullStr Development of lignin based sunblockers for suncreams
title_full_unstemmed Development of lignin based sunblockers for suncreams
title_sort development of lignin based sunblockers for suncreams
publishDate 2016
url http://hdl.handle.net/10356/66394
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