Resurgence of natural colourants: a holistic view

Abstract

Today, natural colourants are emerging globally, leaving synthetic colourants behind in the race, due to the realisation that are safer and ecofriendly in nature. In this context, a brief review of natural colourant sources, their classification, chemical constituents responsible for producing different colours, its activities and effect of different mordants on the hue is discussed.

Exploratory Investigation of Chitosan as Mordant for Eco-Friendly Antibacterial Printing of Cotton with Natural Dyes

“…In addition to previously mentioned, some serious health hazards like allergenicity and, carcinogenicity are associated with some of the synthetic dyes based on azo chromophores. As a result, a ban has been imposed all over the world including European Economic Community (EEC), Germany, USA, and India on the use of some synthetic dyes (e.g., azodyes) which finally triggered active research and development to revive world heritage and traditional wisdom of employing safer natural dyes [5]. Consumers nowadays are becoming more and more concerned about environmental issues and hence are demanding 2 Journal of Textiles for natural product incorporating natural ingredient.…”

Evaluation of Epicoccum nigrum for growth, morphology and production of natural colorants in liquid media and on a solid rice medium

“…There is a growing preference for natural colorants among consumers because of their manifold advantages over synthetic colorants in terms of both health and the environment (Kumar and Sinha 2004). Among microbial sources of natural colorants, micro-algae and filamentous fungi are the most explored ones with the former have a limitation of low productivity.…”

A Review on Ethnomedicinal, Phytochemical and Pharmacological Aspects of Myrica esculenta

“…It is the rich source of vitamin C and polyphenolic compounds such as tannins, phenols, flavonoids and flavonols [19] . Local tribes utilize tree as timber, fuel, fodder, wood [20] as well as used for tanning and obtaining yellow colored dye [21,22] .…”

“…The ethanol extract of bark at dose of 75 mg/kg given by oral route was found to exhibit remarkable antiasthmatic activity through several mechanisms which include: antianaphylactic activity in guinea pigs induced by egg albumin, spasmolytic activity Tannin, ascorbic acid Fruits [13,21,55] Gallic acid Bark [56,57] , fruits [58] , leaves [59] Catechin, cholorogenic acid, p-coumaric acid, caffeic acid, trans-cinnamic acid, ellagic acid Fruit [58] Ethyl-β-D-glucopyranoside; 3-hydroxybenzaldehyde, isovanillin, 4-(hydroxymethyl) phenol, 4-methoxybenzoic acid Leaves [59] Castalagin, epigallocatechin-3-O-gallate; epigallocatechin-(4β→8)-epigallocatechin-3-O-gallate; 3-O-galloylepigallocatechin-(4β→8)-epigallocatechin-3-O-gallate Bark [56] Flavonoids: Myricetin Bark [60,61] , fruits [19] , leaves [62] Quercetin Leaves [63] Flavonoid Glycosides: Myricitrin (myricetin 3-O-rhamnoside) Bark [61] , leaves [59,62] Flavone 4'-hydroxy-3',5,5'-trimethoxy-7-O-β-D-glucopyranosy) (1→4)-α-Lrhamnopyranoside; flavone 3',4'-dihydroxy-6-methoxy-7-O-α-L-rhamnopyranoside Leaves [63] myricetin [61] Steroids: β-sitosterol Bark [12,64] , leaves [59,63] Taraxerol Bark [12,64] Stigmasterol Bark [57] β-rosasterol, daucosterol Leaves [59] β-sitosterol-β-D-glucopyranoside Leaves [63] Ionones: Corchoionoside C; (6S,9R)-roseoside Leaves [62] Diarylhetanoids: Myricanol Bark [65,56,66] , leaves [59,62] Myricanone Bark [56,66] , leaves …”