Difference between revisions of "Lipid"
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==Key Stage 3== | ==Key Stage 3== | ||
===Meaning=== | ===Meaning=== | ||
| − | [[Lipid]]s are | + | [[Lipid]]s are [[molecule]]s found in fats and oils. |
===About Lipids=== | ===About Lipids=== | ||
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| style="height:20px; width:200px; text-align:center;" |Butter is full of fat and we shouldn't eat too much. Butter is found in cakes and cookies. | | style="height:20px; width:200px; text-align:center;" |Butter is full of fat and we shouldn't eat too much. Butter is found in cakes and cookies. | ||
| style="height:20px; width:200px; text-align:center;" |Cooking oil is used to fry our food causing it to have a lot of oil inside it. A small amount is healthy but too much is bad for us. | | style="height:20px; width:200px; text-align:center;" |Cooking oil is used to fry our food causing it to have a lot of oil inside it. A small amount is healthy but too much is bad for us. | ||
| + | |} | ||
| + | |||
| + | ===Testing For Lipids=== | ||
| + | : Adding [[lipid]]s to paper can turn the paper [[translucent]]. | ||
| + | =====The Paper Test Method===== | ||
| + | : 1. Take a small sample of food. | ||
| + | : 2. Wipe it on a piece of paper. | ||
| + | : 3. Hold the paper up to the light. | ||
| + | : 4. If the paper has turned [[translucent]] the food contained [[lipid]]s. | ||
| + | |||
| + | {| class="wikitable" | ||
| + | |- | ||
| + | |[[File:FatTest.png|center|600px]] | ||
| + | |- | ||
| + | | style="height:20px; width:600px; text-align:center;" |There are two patches where fat has been asborbed by the paper. | ||
| + | |} | ||
| + | |||
| + | =====The Alcohol Emulsion Test Method===== | ||
| + | : 1. Take a small sample of food. | ||
| + | : 2. Place the food in [[ethanol]] and mix by shaking or stirring. | ||
| + | : 3. [[Filter]] the [[mixture]]. | ||
| + | : 4. Add the clear [[solution]] to some water. | ||
| + | : 5. If lipids are present then a white [[emulsion]] will appear. | ||
| + | |||
| + | {| class="wikitable" | ||
| + | |- | ||
| + | |[[File:AlcoholEmulsionTest.png|center|600px]] | ||
| + | |- | ||
| + | | style="height:20px; width:600px; text-align:center;" |The mixture on the right shows the presence of [[lipid]]s. | ||
| + | |} | ||
| + | |||
| + | ==Key Stage 4== | ||
| + | ===Meaning=== | ||
| + | [[Lipid]]s are [[molecule]]s, made of a [[glycerol]] head and 3 [[Fatty Acid|fatty acid]] tails, that is found in fats and oils. | ||
| + | |||
| + | ===About Lipids=== | ||
| + | : [[Lipid]]s are an essential [[nutrient]] in our [[diet]] that is used in our [[Nervous System|nervous system]]. | ||
| + | : [[Lipid]]s store [[Chemical Potential Energy Store|chemical energy]] at a higher [[energy]] density than [[carbohydrate]]s so the body stores extra [[energy]] in [[Fatty Tissue|fatty tissue]] made of [[lipid]]s. | ||
| + | : If there are too much [[lipid]]s in our [[diet]] then we can become [[Obesity|obese]]. | ||
| + | : [[Lipid]]s are broken down by our [[Digestive System|digestive system]] into a [[glycerol]] head and 3 [[Fatty Acid|fatty acid]] tails. | ||
| + | : The [[Fatty Acid|fatty acids]] in [[lipid]]s can be many different lengths. | ||
| + | |||
| + | {| class="wikitable" | ||
| + | |- | ||
| + | |[[File:LipidDiagram.png|center|500px]] | ||
| + | |- | ||
| + | | style="height:20px; width:600px; text-align:center;" |This [[diagram]] shows a simple representation of a [[lipid]]. | ||
|} | |} | ||
Revision as of 15:57, 5 November 2018
Contents
Key Stage 3
Meaning
Lipids are molecules found in fats and oils.
About Lipids
- Oil is better for us than fat, but we need some of both.
- If we eat too much fat and oil then we can become obese.
 |
 |
 |
 |
 |
| Meat contains useful fat for our diets, but too much can lead to heart disease. | Fish is a very healthy source of oils in our diet. | Nuts are a healthy source of oils. | Butter is full of fat and we shouldn't eat too much. Butter is found in cakes and cookies. | Cooking oil is used to fry our food causing it to have a lot of oil inside it. A small amount is healthy but too much is bad for us. |
Testing For Lipids
- Adding lipids to paper can turn the paper translucent.
The Paper Test Method
- 1. Take a small sample of food.
- 2. Wipe it on a piece of paper.
- 3. Hold the paper up to the light.
- 4. If the paper has turned translucent the food contained lipids.
 |
| There are two patches where fat has been asborbed by the paper. |
The Alcohol Emulsion Test Method
- 1. Take a small sample of food.
- 2. Place the food in ethanol and mix by shaking or stirring.
- 3. Filter the mixture.
- 4. Add the clear solution to some water.
- 5. If lipids are present then a white emulsion will appear.
 |
| The mixture on the right shows the presence of lipids. |
Key Stage 4
Meaning
Lipids are molecules, made of a glycerol head and 3 fatty acid tails, that is found in fats and oils.
About Lipids
- Lipids are an essential nutrient in our diet that is used in our nervous system.
- Lipids store chemical energy at a higher energy density than carbohydrates so the body stores extra energy in fatty tissue made of lipids.
- If there are too much lipids in our diet then we can become obese.
- Lipids are broken down by our digestive system into a glycerol head and 3 fatty acid tails.
- The fatty acids in lipids can be many different lengths.
 |
| This diagram shows a simple representation of a lipid. |
Testing For Lipids
- Adding lipids to paper can turn the paper translucent.
The Paper Test Method
- 1. Take a small sample of food.
- 2. Wipe it on a piece of paper.
- 3. Hold the paper up to the light.
- 4. If the paper has turned translucent the food contained lipids.
|
| There are two patches where fat has been asborbed by the paper. |
The Alcohol Emulsion Test Method
- 1. Take a small sample of food.
- 2. Place the food in ethanol and mix by shaking or stirring.
- 3. Filter the mixture.
- 4. Add the clear solution to some water.
- 5. If lipids are present then a white emulsion will appear.
|
| The mixture on the right shows the presence of lipids. |