Colourimetric analysis of some powdered medicinal herbs from Ogbomoso, Nigeria

Journal of Medicinal Plants for Economic Development


 
 
Field Value
 
Title Colourimetric analysis of some powdered medicinal herbs from Ogbomoso, Nigeria
 
Creator Ogunkunle, Adepoju Ideh, Jennifer
 
Subject — medicinal herb authentication; pharmacognosy; colourimetry; organoleptography; hexadecimal colour codes; herb misidentification; standardisation of herbal medicine
Description Background: The organoleptic evaluation of herbal drugs is as old as science, but the authentication of herbs on the basis of their fluorescence characteristics is difficult and sometimes impracticable because humans are limited by their sense of colour recognition.Aim: This article undertakes a computer-aided examination of some powdered herbal materials with a view to characterising them calourimetrically, thus providing a reliable organoleptic clue for their authentication, against possible misidentification.Setting: Research was conducted in Ogbomoso, Nigeria.Methods: Seventeen herbal materials (i.e. stem bark, root/root bark, vines, fruit calyx, leaf sheath and seed) used for two traditional powdered drugs were collected and pulverised into powders. Their colours were digitised by scanning the surface of the powders in petri dishes using a CamScanner installed on a Samsung Galaxy Tablet 10.1 Model 7500, and were qualitatively and quantitatively analysed by uploading the images into the online Cool Hypertext Preprocessor (Cool PHP) software tool, setting the number of colours at five, thus giving consideration to only five dominant colour shades in each image, all expressed as hexadecimal codes. The codes were uploaded into Chir.ag/art, another online tool, to read off the colour names. The relative mean percentage, frequency and relative colour intensity (RCI) of each colour shade were calculated, and the colour with the highest RCI was taken as the first or typical colour of each herb.Results: Nine of the 62 colours observed, namely Lucky, Sandrift, Cannon Pink, Potters Clay, Mandalay, Ferra, Domino, Russet and Roti, were highly restricted in distribution, each being the first or typical colour in only one species of the herbs (i.e. Enantia chlorantha, Garcinia kola, Hibiscus sabdariffa, Khaya senegalensis, Sarcocephalus latifolius, Sorghum bicolor, Theobroma cacao, Uvaria chamae and Zanthoxylum zanthoxyloides respectively). These colours were therefore substantially diagnostic of those herbs. Another nine colours among the most frequently observed colours and the number of species that had them were Pesto (9), Shadow (8), Driftwood (8), Barley Corn (5), Domino (4), Roman Coffee (4), Cape Palliser (4), Himalaya (4) and Husk (4); these were less diagnostic of the herbs in question. Based on the distribution of these colours, a diagnostic PHP colour chart was constructed for the authentication of the powdered medicinal herbs.Conclusion: Powders of the 17 medicinal herbs analysed have been characterised colourimetrically with each species being unambiguously diagnosed. The study has therefore circumvented the subjectivity of the human sense of colour recognition in medicinal herb authentication.
 
Publisher AOSIS Publishing
 
Contributor
Date 2019-10-01
 
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — —
Format text/html application/epub+zip text/xml application/pdf
Identifier 10.4102/jomped.v3i1.68
 
Source Journal of Medicinal Plants for Economic Development; Vol 3, No 1 (2019); 8 pages 2616-4809 2519-559X
 
Language eng
 
Relation https://jomped.org/index.php/jomped/article/view/68/236 https://jomped.org/index.php/jomped/article/view/68/235 https://jomped.org/index.php/jomped/article/view/68/237 https://jomped.org/index.php/jomped/article/view/68/234
 
Coverage Ogbomoso, Nigeria 2017-2018 —
Rights Copyright (c) 2019 Adepoju Ogunkunle, Jennifer Ideh https://creativecommons.org/licenses/by/4.0