Summary: Chemistry

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  • 1 Chemistry behind colour changes

    This is a preview. There are 1 more flashcards available for chapter 1
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  • What is the colour of the pigments with the spectra above? an what pigments might these spectra represent?

    First one is yellow/ orange. carotenoid
    Second one is green. chlorophyll
  • 1.1 Caramelization

    This is a preview. There are 8 more flashcards available for chapter 1.1
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  • What is the difference in starting compounds of caramelization and the maillard reaction?

    caramelsiation: reducing sugar
    maillard reaction: amino compound
  • When can you make caramel of sugar or sugar syrup?

    You need:
    • persons of acid or alkaline catalysts 
    • low water activity
    • high temperature
  • What are the different reactions happening in caramelization?

    • Enolization
    • Dehydration
    • oxidation
    • Fission
    • Aldol concdensation
  • Why are there differences in caramelization temrpature?

    these sugars consist out of pyranose and furanose ring sugars. Pyranose has one C more and therefore more stable. You need less energy to open the furnaces ring. 
    Also disacharides need more energy to open and therefore a higher temperature. 
  • Hoe does the enolization step in caramel go?

    Dit is een acid catalysed reaction with mono schrods. 
    De dubble band verplaats van de O naar de 2e C. 
    Dit zorgt voor molecular diversity
  • What happens during the dehydration step?

    A H is extracted from the molecule. and you get different round components.
  • What is formed during the dehydration step?

    Aroma compounds
  • Which monosaccharides yield more products in dehydration, aldoses or ketoses?

    Ketoses since the reaction can go 2 ways in the elongation reaction. Therefore you get a bigger variaty of products in the dehydration reaction.
  • What happens in the oxidation reaction of caramelization?

    The enodial formed with the elongation reaction is very reactive. 
    In an oxidation reaction the H of the two upper C goes of and a double C bond is formed. 

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