Prototypes

Color Catcher® based device

Solid phase

Dylon Colour Catcher®

Receptors

pH indicators (sulphonphtaleins): m-cresol purple (1), o-cresol red (2), bromothymol blue (3), thymol blue (4), chlorophenol red (5)

Selective probes: Ellman’s reagent (6)

Linkage mechanism

Ion exchange

Reference colours

Food tested

Cod fillets

Beef slices

Chicken breast slices

Pork slices

EVOH (32%) based device

Solid phase

Ethylene vinyl alcohol copolymer (EVOH)

32% ethylene content

Receptors

pH indicators (sulphonphtaleins): m-cresol purple (1), o-cresol red (2), bromothymol blue (3), thymol blue (4), chlorophenol red (5), bromophenol blue (6)

 

Linkage mechanism

Covalent functionalisation

Reference colours for protein foods

Food tested

Cod fillets

Chicken breast slices

Reference colours for milk

Milk tested

Whole milk

Semi-skimmed milk

Skimmed milk