Barevné změny anthokyanů
Title Alternative:Colour changes in anthocyanins
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Date
2011
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Publisher
Technická Univerzita v Liberci
Abstract
Cílem DP bylo prostudovat barevné změny rostlinných antokyanů v závislosti na změně pH prostředí, stanovit jejich obsah v různých rostlinných šťávách a posoudit možnost jejich použití v textilním barvířství. V experimentální části byla proměřena absorpční spektra některých antokyanů, posouzena stabilita antokyanů v kyselém a zásaditém prostředí, pomocí kalibrační křivky a standardu (kyselina gallová) bylo provedeno spektrofotometrické stanovení obsahu polyfenolů ve šťávách z černého bezu, borůvek a červeného zelí. Vzhledem k nejzajímavějším barevným změnám byla k barvení textilií (vlna, bavlna) použita šťáva z červeného zelí, následně proměřena remisní spektra barvených textilií, posouzena stálost vybarvení a navrženo snadné barvení vlněné textilie s opakovanými vratnými barevnými změnami.
The aim of this thesis was to study changes in vegetable anthocyanins depending on the change of pH milieu,to determine their content in different vegetable juices and to assess their possible use in textile dyeing. In the experimental section there were measured the absorption spectra of some anthocyanins, considered stability of anthocyanidins in the acid as well as basic medium and by means of calibration curve and standard (gallic acid) was performed spectrophotometric determination of content of polyphenols in black elderberry, blueberries and red cabbage juices. For dyeing fabrics (wool and cotton) was used the juice of red cabbage because of the most interesting colour changes. Subsequently were measured the remission spectra of dyed fabrics, assessed colour permanency and proposed easy dyeing for woolen fabrics with repeated reversible colour changes.
The aim of this thesis was to study changes in vegetable anthocyanins depending on the change of pH milieu,to determine their content in different vegetable juices and to assess their possible use in textile dyeing. In the experimental section there were measured the absorption spectra of some anthocyanins, considered stability of anthocyanidins in the acid as well as basic medium and by means of calibration curve and standard (gallic acid) was performed spectrophotometric determination of content of polyphenols in black elderberry, blueberries and red cabbage juices. For dyeing fabrics (wool and cotton) was used the juice of red cabbage because of the most interesting colour changes. Subsequently were measured the remission spectra of dyed fabrics, assessed colour permanency and proposed easy dyeing for woolen fabrics with repeated reversible colour changes.
Description
katedra: KTC; rozsah: 112 s.
Subject(s)
antokyany, antokyaniny, antokyanidiny, přírodní barviva, antioxidanty, polyfenoly, flavonoidy, spektrofotometrie, ph, kyselost, zásaditost, anthocyans, anthocyanins, anthocyanidins, natural dyes, antioxidants, polyphenols, flavonoids, spectrophotometry, ph, acidity, basicity