Dyeing Properties of Vilangin Synthesized from Embelin on Cotton Fibre
Date
2021-12-25Author
Koske, Margaret C.
Kiprop, Ambrose K.
Chepkwony, Sarah C.
K’Owino, Isaac O.
Metadata
Show full item recordAbstract
Semi synthesis involves the use of chemical compounds isolated from natural
sources as the starting materials to produce other distinct compounds with added
value and improved chemical properties. Most modified dyes have been
synthesized through chemical modification to increase solubility and fastness
properties of the dyes. A semi-synthetic dye (vilangin) has been obtained through
chemical modification of embelin (a benzoquinone) isolated from Embelia
schimperi berries crude extract, a plant-based dye. The vilangin dye was
synthesized by condensation of embelin with formaldehyde in acetic acid solution.,
Their melting point and thin layer chromatography was done to determine purity.
Characterization was done using Ultraviolet–Visible spectroscopy, Fourier
Transform Infrared spectroscopy, Liquid chromatography Mass spectrometry and
Nuclear Magnetic Resonance Spectroscopy. Embelin and the semi- synthesized dye
were applied on cotton fabrics and colour fastness properties such as wash fastness,
rubbing fastness, light fastness were evaluated. Embelin dye and vilangin dye
exhibited similar colour strengths (K/S values) of 0.18 and 0.19 respectively. Use of
mordants increased the colour strengths from 0.19 to 0.23 for the pre-mordanted
cotton fibers ,the post-mordanted were in the range of 0.19-0.32 whereas the
simultaneous mordanting showed better characteristics in the range of 0.27-0.52
for the vilangin dye. It has thus been established that the semi-synthetic dye
possessed superior fastness properties compared to the parent embelin dye.
URI
https://doi.org/10.14738/aivp.96.11308.https://www.researchgate.net/profile/Margret-Chepkemoi-Koske/publication/357414940_Dyeing_Properties_of_Vilangin_Synthesized_from_Embelin_on_Cotton_Fibre/links/627ce231107cae29199ff813/Dyeing-Properties-of-Vilangin-Synthesized-from-Embelin-on-Cotton-Fibre.pdf
http://ir-library.mmust.ac.ke:8080/xmlui/handle/123456789/2497
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