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Natural Coloring Agents

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Natural Coloring Agents Natural coloring O agents H N N Biologically Active Natural Compounds H O 1 COLORANTS DYES PIGMENTS WATER ORGANIC VAT DISPERSE etc. PIGMENTS LACQUERS etc. SOLUBLE SOLUBLE DYES Colorants are characterized by their ability to absorb visible part of the electromagnetic spectrum [380-780 nm]. For good colouring property it has to have high enough absorption coefficient (10 000 to 40 000 l.mol-1.cm-1 ). Further it must have properties enabling it to keep with coloured material and stability (fotochemical, chemical, oxidation ...). As a rule, colorants nowadays have to be harmless. Sometimes we also distinguish [i.a.]: onedimensional pigments (they absorb certain wavelength and reflect the rest) twodimensional (they reflect the light mirror-like) threedimensional (they reflect with pearl effect) Biologically Active Natural Compounds 2 Natural Dyestuffs The most important dyes extracted from animal sources are natural sepia (from the ink sac of the cuttlefish), crimson (from the kermes louse) and Tyrian purple (the Imperial purple of the ancient world, from the murex shellfish). Very many dyes have been extracted traditionally from roots, berries, flowerheads, barks and leaves. Red dyes include madder (from 'dyer's root', the madder plant), brazilwood, beetroot, cranberry, safflower ('dyer's thistle'), and orchil ('dyer's moss'). Orange dye is obtained from stigmas of the saffron flower, yellows from camomile and milkwort flowers, plus weld ('dyer's herb'). Greens are obtainable from ripe buckthorn berries and ragweed; and blue from the woad plant (also called 'dyer's weed') and indigo. As a rule, vegetable dyes are extracted by pounding or cutting up the colouring material. This is immersed in water, heated to just below boiling point and simmered until the colour has been transferred from the dye solution. Colorants could be divided by their Biologically Active Natural Compounds a/ colour, b/ chemical composition or structure, c/ biological function in plant/organism (chlorophyll, haemoglobin …), d/ physical properties (solubility), e/ etc. 3 For most natural dyestuffs to be effective, the article to be coloured must first be saturated with a fixer or mordant, a mineral compound which 'bites' the fibres of the cloth in order to permit the insoluble adhesion of the colouring agent. (A typical mordant consists of a 4:1 mixture of alum [aluminum sulfate Al2(SO4)] and cream of tartar [potassium hydrogen tartrate, KC4H5O6].) The use of other metallic salts, as those containing chromium, copper, tin or iron, make it possible to obtain a considerable range of colours from a single dye source. What is the function of a mordant? O OO M insoluble dye forms complex H2O H2O where mordant can help HO O + NH2 Biologically Active Natural Compounds protein fibre 4 Categories of Natural Colorants, examples Colors Chemical Classifications Common Names Yellow and Brown Flavone dyes Weld, Quercitron, Fustic, Osage, Chamomile, Tesu, Dolu, Marigold, Cutch Yellow Iso-quinoline dyes Barberry Polyene colorants beta-carotene, lycopene … Pyran colorants gentisin Orange-Yellow Chromene dyes Kamala Brown and Purple-Grey Naphthochinone dyes Henna, Walnut, Alkanet, Pitti Red Chinone and Lac, Cochineal, Madder Anthrachinone dyes (Majithro) Chromene dyes Santalin Biologically Active Natural Compounds Purple and Black „Benzophyrone“ dyes Logwood Blue Indigoid Dyes and Indigo Indole colorants 5 Natural Colorants, some typical examples Blue - woad Isatis tinctoria (Brassicaceae) [boryt barvířský] indigo Indigofera tinctoria (Fabaceae) [indigovník barvířský] cornflower flower Centaurea cyanus [květy chrpy modré] bilberry fruits Vaccinium myrtillus [plody borůvek] fruits of Common Elderberry (Sambucus nigra) [plody černého bezu] European ash (Fraxinus excelsior)[kůra jasanu ztepilého] Yellow - turmeric rhizome Curcuma domestica [oddének kurkumy] Safflower (Carthamus tinctorius) [světlice barvířská] carrot (Daucus carota)[kořen mrkve] big marigold Tagetes erecta [aksamitník vzpřímený] Orange - sweet peppers, paprika Capsicum annuum [paprika] annato Bixa orellana [anato] saffron red stigmas Crocus sativus [šafrán] bloodroot Sanguinaria canadensis [krvavěnka] Green - chlorophyll [chlorofyl] Brown - cocoa Theobroma cacao [kakao] fermented tea Camellia thea [čaj] henna Lawsonia inermis [henna pravá] Biologically Active Natural Compounds Purple - alkanet root Alkanna tinctoria [kamejník barvířský] Black and brown - carbon and caramel [uhel a karamel] Confederate gray - butternuts Juglans cinerea [ořešák popelavý] White - titanium oxide [oxid titaničitý] 6 Natural colorants, some typical examples Red Red could have been dyed with madder (Rubia tinctoria) which was used in central Europe since 800 A.D. Red can also be produced from native plants and sources such as: Northern Bedstraw Galium boreale, Hedge Bedstraw Galium album mollugo, Lady's Bedstraw Galium verum, Dyers Woodruff ' Asperula tinctoria, St. John's Wort Hypericum perforatum, paprika (may be irritating), grapes Vitaceae, red cabbage Brassica oleracea capitata, black currants Ribes (cyanins) cochineal. carmina Coccus cacti or Dactylopius coccus red beet, Beta vulgaris (betanin) Reds from Mushrooms The Dermocybe family of mushrooms produces oranges and reds. Additon of an iron mordant gives darker shades and almost black. With older mushrooms, longer cooking times or the addition of ammonia can give lilac shades. Low heat or the addition of acid or Biologically Active Natural Compounds vinegar gives warm reds. Dictyophora cinnabarina Cortinarius semisanguineus 7 Blue Blue was the most used colour in many of the fabrics from the gravesites. Blue may have come from Dyers Woad, Isatis tinctoria. Blue from Mushrooms Thelephora With iron or tin mordants, yields greens and blues. Hydnellum suaveolens, Sarcodon imbricatus, Yields blues if it is old and its top has darkened. Hapalopilus rutilans, With ammonia, yields strong, colourfast violet blue shades. Cortinarius violaceus Produces violet blue shades, and with an iron mordant, dark greys. Biologically Active Natural Compounds 8 mineral dyes ocher mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite. Ocher grades into sienna, a yellow-brown pigment containing a higher percentage of iron ore than ocher as well as some manganese dioxide; sienna grades into umber, which is darker brown and contains a higher percentage of manganese dioxide. Burnt sienna is brown or bright red; burnt umber is a darker brown than umber. white, titanium oxide, limestone black, carbon, sooth Biologically Active Natural Compounds green, malachite blue, azurite, turquoise red, zinober, iron oxides and hydroxides 9 The principle of the fact that something has a colour is in the interaction of the substance with a light which is then reflected or passed through. The substance could be also involved in the process of light generation (electric arch, burning ...). The interaction influences different wavelenght intensity of the light. Most common is the interaction of photons with electron orbitals of molecules. This effect is discussed with electron spectra (UV-VIS). To see the colours we need a detector which is commonly a spectrophotometer (or for the wavelengths between 400 and 800 nm also human eye) which is capable of distinguishing the changes. chromophore From the Greek from Greek chromophorus (chromos colour), or „colour carrier“, a chromophore is generally a groups of atoms in a molecule responsible for the interaction with the radiation at certain wavelength; example of common chromophore is conjugated multiple bond, rich in Biologically Active Natural Compounds electrons 10 light irradiates the surface reflected light is seen in (white, polychromatic) complementary colour and we see it as blue-green orange part is absorbed (610 nm) light irradiates the surface (white, polychromatic) orange part is Biologically Active Natural Compounds absorbed (610 nm) thorough light is seen in complementary colour 11 and we see it as blue-green sample absorbs yellow resulting light composition is seen as violet- -blue UV VIS NIR IČ FIR 100 200 400 800 nm 0,1 0,2 0,4 0,8 2,5 15 50 µm 12500 4000 670 cm-1 observed colour absorbed colour absorbed wavelength green red 700 nm blue-green orange red 600 nm violet yellow 550 nm violet-red yellow green 530 nm Biologically Active Natural Compounds red blue green 500 nm orange blue 450 nm yellow violet 400 nm 12 13 how photons can interact with the electron orbitals: typlical molecular orbital is as follows: energy Biologically Active Natural Compounds 14 energy of the light which passes through the sample is absorbed by some electrons and they are in that way “excited” to a higher energetic level (state) let us see this situation in butadiene, e.g. ψ4* π* ψ3* LUMO π ψ2 HOMO ψ four basic p 1 atomic orbitals normal state of molecule orbitals of butadiene excited state Biologically Active Natural Compounds LUMO – Lowest Unoccupied Molecular Orbital HOMO – Highest Occupied Molecular Orbital 15 non-conjugated alkene is not “rich in electrons” in common non-conjugated alkene the situation is simple: π* ψ2* LUMO π ψ1 HOMO two basic p atomic orbitals ground state of a molekular excited state orbital of butadiene Biologically Active Natural Compounds 165 nm ε 15,000 16 there are “allowed” and “forbidden” energy transitions in carbonyl we observe also the forbidden transition n->π* π* π* n π n π* π
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