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Natural dyes for smart packaging
Nyklesová, Ludmila ; Dzik, Petr (referee) ; Veselá, Mária (advisor)
This thesis focuses on the use of natural dyes in smart food packaging as pH change indicators. The theoretical part of the thesis describes smart packaging, which can be divided into active and intelligent packaging. Within intelligent packaging, the thesis focuses mainly on pH indicators, including their composition, i.e., the polymer used and the dyes, with an emphasis on anthocyanin dyes. The theoretical part also includes a description of the methods used to measure the color changes of prepared indicators. In the experimental part of the thesis, anthocyanin dye is extracted from Aronia melanocarpa berries and thin films containing the anthocyanin extract are prepared. The color change of the prepared thin layers is further studied in an environment with a low concentration of ammonia. Layers that showed a reaction to the ammonia environment were subsequently overprinted with white UV varnish, and their reaction to an environment with low ammonia content was observed.
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