Matrices for detecting volatile organic compounds
AssigneeAuburn University
InventorsBurak Aksoy, Zhihua Jiang, Mediha Aksoy, Benjamin Beck, Navid E. Alamdari
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Abstract
A device for detecting volatile compounds. The device includes a substrate and a matrix disposed on the substrate. The matrix includes a carboxyl-rich binder, a clay, and a pH-sensitive indicator dye admixed with the binder and the clay. The pH-sensitive indicator dye is dimensioned and configured to change color in response to contact with a pre-determined concentration of a volatile compound.
Claims19
A device for detecting volatile compounds, the device comprising:
- a substrate;
- a matrix disposed on the substrate, the matrix comprising
- a binder comprising carboxyl-containing biomass
- a clay;
- and
- a pH-sensitive indicator dye admixed with the binder and the clay;
- wherein the pH-sensitive indicator dye is used in a concentration that allows the pH-sensitive indicator dye to change color in response to contact with a concentration of a volatile compound.
A device for detecting volatile basic compounds, the device comprising:
- a substrate;
- a matrix disposed on the substrate, the matrix comprising
- a binder comprising acid-treated soybean hulls;
- a smectite clay;
- and
- a pH-sensitive indicator dye admixed with the binder and the smectite clay;
- wherein the pH-sensitive indicator dye is used in a concentration that allows the pH-sensitive indicator dye to change color in response to contact with a pre-determined concentration of a volatile basic compound.
A method for showing freshness and testing spoilage of food, the method comprising
- (a) providing a device comprising:
- a substrate;
- a matrix disposed on the substrate, the matrix comprising
- a binder comprising carboxyl-containing biomass;
- a clay;
- and
- a pH-sensitive indicator dye admixed with the binder and the clay;
- wherein the pH-sensitive indicator dye is used in a concentration that allows the pH-sensitive indicator dye to change color in response to a concentration of total volatile base nitrogen compounds generated by spoilage microorganisms growing within a food product;
- and
- wherein the change in color of the pH-sensitive indicator dye occurs at or below a threshold concentration of spoilage microorganisms within the food product at which the food product is deemed unsafe to consume by humans;
- and
- (b) placing the device of step (a) in a package of food.
Dependencies are inferred from the claim text.