Food Chemistry

Testing Liquids and Foods for Fats

Testing Liquids and Foods for Fats

FAT Insulates us from the cold (keeps us warm) Cushions us from bruises and injuries Gives us energy

Per pound, fats give 2x’s as much energy as carbohydrates (sugars & starches)

Testing Liquids and Foods for Fats

Three kinds of fats: SATURATED - Not as good for you.

Examples: Butter, Eggs, Ice Cream May raise the level of bad cholesterol in your

blood. Could cause clogged arteries and heart disease (LDL).

Testing Liquids and Foods for Fats

Three kinds of fats: UNSATURATED - Not as bad for you.

Examples: Liquids like cooking oils Less harmful to your health. Considered “good fat”. May help lower your blood cholesterol (HDL).

Testing Liquids and Foods for Fats Three kinds of fats:

TRANS FAT - Created by adding hydrogen bonds to unsaturated liquid fats. Allows them to last longer. Mostly man-made.

Examples: Shortening, hard stick margarine, cookies, crackers, and snack foods made with partially hydrogenated oil.

Harmful to your health. Raises your bad cholesterol levels (LDL)

Testing Liquids and Foods for Fats

Brown Paper Bag Strips - The indicator used to show that fat is in a liquid or food.

What do you look for?

Testing Liquids and Foods for Fats

The brown paper bag strip shows a greasy stain = positive test. It does contain fat.

The darker the stain, the greater the amount of fat.

The brown paper bag strip doesn’t show greasy stain = negative test. It does not contain fat.