Naphthoquinone colorants from Arnebia nobilis Rech.f

Abstract

The roots of Arnebia nobilis have traditionally been used as a colorant in food and cosmetic preparations. The deep red colour obtained is attributed to the presence of shikonin and its isomer alkannin and their derivatives. In this study, five colouring components were extracted from the roots of A. nobilis. These were separated and purified chromatographically and characterised using various spectrophotometric techniques. Three of the five components were identified. The major component was found to be alkannin β, β‐dimethylacrylate [5,8‐dihydroxy‐2‐(1′‐β, β‐dimethylacryloxy‐4′‐methylpent‐3′‐enyl)‐1,4‐naphthoquinone], accounting for nearly 25% of the total colouring matter. Alkannin acetate [2‐(1′‐acetoxy‐4′‐methylpent‐3′‐enyl)‐5,8‐dihydroxy‐1,4‐naphthoquinone] made up ca. 8% and shikonin [(5,8‐dihydroxy‐4′‐methylpent‐3′‐enyl)‐1,4‐naphthoquinone] contributed ca. 6% of the colouring matter. Polyester was dyed pink, nylon was dyed blue and all other substrates acquired a purple hue under similar dyeing conditions. The dyed fabrics showed excellent wash, rub and perspiration fastness; however, light fastness was found to be poor.

Natural Quinone Dyes: A Review on Structure, Extraction Techniques, Analysis and Application Potential

“…Nylon and polyester are the most important synthetic fibres coloured by quinone dyes [212,213]. Acrylic and regenerated fibres, such as cellulose acetate, viscose and rayon, have also been dyed using natural quinone dyes [214,215].…”

Green synthesis of silver nanoparticles using Arnebia nobilis root extract and wound healing potential of its hydrogel

“…[25] The two hydroxyl groups present in the benzene ring are participating in the reduction reaction. In the probable reaction mechanism [ Figure 7], Ag + first forms an intermediate silver complex and then finally silver ion and quinone.…”

“…6% of the coloring matter. [25] In this article, we have reported the microwave assisted rapid green synthesis of stable AgNPs using A. nobilis root extract, antibacterial potential and effect on wound healing and reduction in scar appearance through excision rat model. The antibacterial potential of the synthesized AgNPs was assessed against both Gram classes of bacteria.…”

Τεχνολογική Βελτιστοποίηση Βιοδραστικών Ναφθοκινονών

“…Ζ αθθδθεπίδναζδξ ηδξ δέζιεοζδξ ιαηνμιμνίμο-ζοκδέηδ πναβιαημπμζήεδηε ιε ηδ αμήεεζα θαζιαημθςημιεηνίαξ, θαζιαημθεμνζμιεηνίαξ, οβνήξ πνςιαημβναθίαξ ορδθήξ απυδμζδξ (HPLC) ηαζ θαζιαημιεηνίαξ ιάγαξ (MS) [95] . [96] .…”

“…Πανυθμ πμο μζ ζοκεήηεξ ήηακ πανυιμζεξ, ημ κάοθμκ πνςιαηίζηδηε ιπθε, εκχ μ πμθοεζηέναξ νμγ, θυβς ηδξ θφζδξ ηςκ αθθδθεπζδνάζεςκ ιεηαλφ ηδξ ααθήξ ηαζ ηςκ ζκχκ. Σα οθάζιαηα πμο οπέζηδζακ ααθή, ειθάκζζακ ελαζνεηζηή ακημπή ζε πθφζζιμ, ηνζαή ηαζ ζδνχηα, εκχ δ ακημπή ημοξ ζημ θςξ απμδείπηδηε ιζηνή [96] .…”