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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Colorant properties and stability of Reynoutria pigments
 DVOŘÁK, Vojtěch
This bachelor thesis is focused on invasive species of the genus Reynoutria, specifically on obtaining color extracts from their rhoots and subsequent evaluation of their color properties under various environmental conditions in laboratory conditions. The color properties of extract L, a, b, Cab, h and Eab were evaluated using a colorimeter. The extracts were obtained with 96°C warm water, cold water and 100% ethanol from dried and fresh material. The dye content in rhizomes and stems of Reynoutria japonica and Reynoutria sachalinesis was evaluated based on the total The roots of Reynoutria japonica and Reynoutria sachalinesis can be used as a source of yellow to red-violet dye. For the preparation of the extract, dried roots can be recommended at an extraction ratio of 3 g per 1 liter of water and extraction at 95 ° C for 1 hour. The information obtained can potentially be used in the application of dyes in industry or, after verification of health safety, also in the food industry.
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