Testing for Lipids - Revision history

NRJC at 20:44, 17 April 2025

2025-04-17T20:44:35Z

NRJC at 20:43, 17 April 2025

2025-04-17T20:43:55Z

NRJC at 20:42, 17 April 2025

2025-04-17T20:42:03Z

NRJC: Created page with "==Key Stage 3== ===Meaning=== Lipids can be tested for with different methods. =====The Paper Test Method===== : 1. Take a small sample of food. : 2. Wipe it on a piece o..."

2018-09-16T11:19:21Z

Created page with "==Key Stage 3== ===Meaning=== Lipids can be tested for with different methods. =====The Paper Test Method===== : 1. Take a small sample of food. : 2. Wipe it on a piece o..."

New page

==Key Stage 3==
===Meaning===
[[Lipid]]s can be tested for with different methods.

=====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.
|}

@@ Line 38: / Line 38: @@
 {| class="wikitable"
 |-
-|[[File:SudanIII.png|center|600px]]
+|[[File:SudanIII.jpg|center|600px]]
 |-
 | style="height:20px; width:600px; text-align:center;" |The mixture shows the SudanIII has turned red in the presence of [[lipid]]s.
 |}

← Older revision		Revision as of 20:43, 17 April 2025
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	: 3. If lipids are present, a red-stained oil layer will form on the surface of the water.		: 3. If lipids are present, a red-stained oil layer will form on the surface of the water.
	: 4. If no red-stained oil layer forms, the food sample likely does not contain fats.		: 4. If no red-stained oil layer forms, the food sample likely does not contain fats.
		+
		+	{\| class="wikitable"
		+	\|-
		+	\|[[File:SudanIII.png\|center\|600px]]
		+	\|-
		+	\| style="height:20px; width:600px; text-align:center;" \|The mixture shows the SudanIII has turned red in the presence of [[lipid]]s.
		+	\|}

← Older revision		Revision as of 20:42, 17 April 2025
Line 29:		Line 29:
	\| style="height:20px; width:600px; text-align:center;" \|The mixture on the right shows the presence of [[lipid]]s.		\| style="height:20px; width:600px; text-align:center;" \|The mixture on the right shows the presence of [[lipid]]s.
	\|}		\|}
		+
		+	=====The Sudan III Test Method=====
		+	: 1. Mix a small amount of the food sample with water in a test tube.
		+	: 2. Add a few drops of Sudan III dye to the test tube and mix.
		+	: 3. If lipids are present, a red-stained oil layer will form on the surface of the water.
		+	: 4. If no red-stained oil layer forms, the food sample likely does not contain fats.