You must take off the orange part of the peel.
Using dry ice on orange peels can make the difference between throwing away and wasting unused orange peels and extracting the chemical limonene, used in recipes, medicines, cosmetics, fire extinguishers and household cleaners. Limonene, which comes from the word lemon, adds a citrus-smelling fragrance to your products.
Instructions
1. Put on rubber gloves. Use a cheese grater to remove the orange surface of the orange peel. Do not remove the white pith. Cut the rest of the orange peel into small pieces.
2. Cut 8 to 9 inches of wire, and then wrap the metal wire around a 14 milliliter tube, so that the coiled wire will fit inside of the 15 milliliter centrifuge tube. You can use the pliers to coil the wire around the tube if you cannot do it by hand.
3. Place the cone-shaped paper filter in the 15 milliliter tube, then push the coiled wire through the top. With the paper filter and coil already in the centrifuge, place the orange shavings through the top of the tube.
4. Fill the first 600 ml beaker with hot water.
5. Place the dry ice into the second beaker and crush the dry ice with a mallet.
6. Place enough crushed dry ice into the centrifuge tube to fill it, then cover the tube immediately. Submerge the tube into the beaker filled with hot water and wait five to seven minutes or until the dry ice has melted.
7. Lift the tube out of the water, and then lift the lid from the tube. Allow the melted dry ice, which is now a gas, to filter out of the tube. Once the gas has left the tube, the limonene will be at the bottom of the tube. Use the forceps to take the orange shavings, paper filter and coiled wire out of the centrifuge tube, and then pour the limonene into the third beaker.
Tags: centrifuge tube, coiled wire, paper filter, milliliter tube, orange peel, orange peels, orange shavings
