Preliminary characterization of some natural dyes | Zendy

Amarachukwu Ezeokonkwo Mercy | Zendy; Sunday N. Okafor | Zendy; Evelyn Evelyn | Zendy

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Preliminary characterization of some natural dyes

Author(s) -

Amarachukwu Ezeokonkwo Mercy,

Sunday N. Okafor,

Evelyn Evelyn

Publication year - 2018

Publication title -

african journal of pure and applied chemistry

Language(s) - English

Resource type - Journals

ISSN - 1996-0840

DOI - 10.5897/ajpac2018.0767

Subject(s) - chemistry , conjugated system , absorption (acoustics) , nuclear chemistry , nitro , carbon fibers , alkyl , organic chemistry , polymer , composite number , materials science , composite material

A preliminary study on the chemical structure of dyes from Rothmannia hispidia, Pterocarpus osun and Terminalia superba was made using chemical tests, UV-visible and infrared spectroscopies. R. hispidia dye was found to contain an alkyl amino group (-NHR) and carbon-carbon double bond conjugated with a carbonyl (C = O) group, and also showed maximum absorption at 595 nm in the visible region. P. osun dye contains conjugated systems, hydroxyl (-OH) and amino (NHR) groups and showed maximum absorption at 506 nm in the visible region whereas T. superba dye is made up of conjugated system, nitro (NO2) and hydroxyl (-OH) groups. It showed maximum absorption at 478 nm in the visible region. Key words: Rothmannia hispidia, Pterocarpus osun, Terminalia superba, dyes, characterization.

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