Purpose: To extract and purify the active ingredient of a spice from its natural product source using a solvent extraction method.
Safety: The ethyl ether is volatile and flammable. Keep it away from any source of ignition and its boiling point is around room temperature so keep it in a closed container or under the fume hood
Background: One of the easiest physical methods for isolating a compound is solvent extraction. The compound is separated from impure material by using a solvent. The solvent dissolves the desired material. An example is the making of coffee using water. This lab uses ethyl ether to extract cinnemaldehyde from cinnamon sticks. Cinnamaldehyde is an organic compound containing an aldehyde functional group. The general structural formulas for aldehydes and ketones are:
This lab uses the Tollens test to test for aldehydes. This test works on the principle that aldehydes are easily oxidized and will convert Ag+ to Ag forming a silver mirror.
Procedure: 1. Add water to a 400 mL beaker and bring it to a boil. Break a cinnamon stick into small pieces and place them in a reaction vial with water. Place the reaction vial in the boiling water and boil for 25 minutes. Place the vial in cold water for three minutes. 2. Add 2-3 mL of ethyl ether to the cinnamaldehyde mixture. Invert the vial several times and transfer the upper organic solvent layer to a clean vial. Repeat this process then dry the cinnamaldehyde solution with sodium sulfate. Transfer the remaining solution to a Petri dish and allow the ethyl ether to evaporate. Smell the remaining cinnamaldehyde. 3. Test for the presence of an aldehyde by adding 1 mL of silver nitrate, 1 mL of 10% NaOH, and then slowly add g M ammonium hydroxide until all the silver dissolves. Then add that mixture to the Petri dish and wait for the appearance of a silver screen to confirm the presence of an aldehyde.
Questions: 1. Some oils are extracted nature by solvent extraction. There are also some dyes and aromatic liquids that can be extracted via solvent extraction.
3. They\'re associated with tastes and fragrances because they react with the parts of the brain that associated with small and taste and therefore cause the body to experience the sensation of smells and tastes.
Purpose: To extract and purify the active ingredient of a spice from its natural product source using a solvent extraction method.
Safety: The ethyl ether is volatile and flammable. Keep it away from any source of ignition and its boiling point is around room temperature so keep it in a closed container or under the fume hood
Background: One of the easiest physical methods for isolating a compound is solvent extraction. The compound is separated from impure material by using a solvent. The solvent dissolves the desired material. An example is the making of coffee using water. This lab uses ethyl ether to extract cinnemaldehyde from cinnamon sticks. Cinnamaldehyde is an organic compound containing an aldehyde functional group. The general structural formulas for aldehydes and ketones are:
This lab uses the Tollens test to test for aldehydes. This test works on the principle that aldehydes are easily oxidized and will convert Ag+ to Ag forming a silver mirror.
Procedure:
1. Add water to a 400 mL beaker and bring it to a boil. Break a cinnamon stick into small pieces and place them in a reaction vial with water. Place the reaction vial in the boiling water and boil for 25 minutes. Place the vial in cold water for three minutes.
2. Add 2-3 mL of ethyl ether to the cinnamaldehyde mixture. Invert the vial several times and transfer the upper organic solvent layer to a clean vial. Repeat this process then dry the cinnamaldehyde solution with sodium sulfate. Transfer the remaining solution to a Petri dish and allow the ethyl ether to evaporate. Smell the remaining cinnamaldehyde.
3. Test for the presence of an aldehyde by adding 1 mL of silver nitrate, 1 mL of 10% NaOH, and then slowly add g M ammonium hydroxide until all the silver dissolves. Then add that mixture to the Petri dish and wait for the appearance of a silver screen to confirm the presence of an aldehyde.
Questions:
1. Some oils are extracted nature by solvent extraction. There are also some dyes and aromatic liquids that can be extracted via solvent extraction.
2. Chemical Odor
Isoamyl acetate Banana
Cinnamic aldehyde Cinnamon
Ethyl propionate Fruity
Limonene Orange
Ethyl-(E,Z)-2,4-
decadienoate Pear
Allyl hexanoate Pineapple
Methyl salicylate Wintergreen
3. They\'re associated with tastes and fragrances because they react with the parts of the brain that associated with small and taste and therefore cause the body to experience the sensation of smells and tastes.
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