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What is a primary use of the fresh mucilagenous gel from Aloe vera leaves?
What is a primary use of the fresh mucilagenous gel from Aloe vera leaves?
Where is the mucilagenous gel found in Aloe vera leaves?
Where is the mucilagenous gel found in Aloe vera leaves?
Which of the following benefits is NOT associated with the gel of Aloe vera?
Which of the following benefits is NOT associated with the gel of Aloe vera?
What type of effect does the Aloe vera gel possess?
What type of effect does the Aloe vera gel possess?
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In what context is the fresh mucilagenous gel from Aloe vera leaves commonly used?
In what context is the fresh mucilagenous gel from Aloe vera leaves commonly used?
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Which of the following solvents is Aloes completely soluble in?
Which of the following solvents is Aloes completely soluble in?
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What is the primary constituent of all varieties of Aloes?
What is the primary constituent of all varieties of Aloes?
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Which of the following statements about Aloes is true?
Which of the following statements about Aloes is true?
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Which compound is known as a hydrolytic decomposition product of barbaloin found in Aloes?
Which compound is known as a hydrolytic decomposition product of barbaloin found in Aloes?
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Which of the following correctly describes the solubility of Aloes in different substances?
Which of the following correctly describes the solubility of Aloes in different substances?
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What color is produced in the ammoniacal layer when testing for free anthraquinones?
What color is produced in the ammoniacal layer when testing for free anthraquinones?
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In the anthraquinone test, what is the purpose of shaking the ether layer with diluted NH4OH?
In the anthraquinone test, what is the purpose of shaking the ether layer with diluted NH4OH?
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How much ether is added to the 10 ml of filtrate during the anthraquinone test?
How much ether is added to the 10 ml of filtrate during the anthraquinone test?
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What is the first step in the test for free anthraquinones?
What is the first step in the test for free anthraquinones?
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Which of the following compounds forms a pale yellow ppt?
Which of the following compounds forms a pale yellow ppt?
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What is colophony primarily derived from?
What is colophony primarily derived from?
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Which of the following statements is true regarding colophony?
Which of the following statements is true regarding colophony?
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Which species is not associated with the production of colophony?
Which species is not associated with the production of colophony?
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What process results in the formation of colophony?
What process results in the formation of colophony?
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Colophony is commonly associated with which family of trees?
Colophony is commonly associated with which family of trees?
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What is the primary testing method used for identifying a freshly fractured surface of a tear?
What is the primary testing method used for identifying a freshly fractured surface of a tear?
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Which reagents are used in the test for combined umbelliferone?
Which reagents are used in the test for combined umbelliferone?
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What is the result after filtering a boiled mixture into a strongly alkaline solution?
What is the result after filtering a boiled mixture into a strongly alkaline solution?
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What is the purpose of making the water strongly alkaline with NH4OH in the test for combined umbelliferone?
What is the purpose of making the water strongly alkaline with NH4OH in the test for combined umbelliferone?
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What is formed when 1g Asafoetida is reacted with 20 ml of HCl and then filtered into an alkaline solution?
What is formed when 1g Asafoetida is reacted with 20 ml of HCl and then filtered into an alkaline solution?
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Study Notes
Solubility of Aloes
- Partially soluble in water.
- Insoluble in organic solvents such as ether, petroleum ether, and chloroform.
Constituents of Aloes
- Contains yellow crystalline anthraquinone glycoside known as barbaloin.
- Includes resin and aloe-emodin, which is a hydrolytic decomposition product of barbaloin.
Medical Uses
- Fresh mucilaginous gel from Aloe vera leaves, located just under the skin, is used for:
- Treating burns.
- Alleviating skin irritations.
- Emollient effects for skin.
Test for Free Anthraquinones
- Procedure:
- Combine 10 ml of filtrate with 20 ml of ether.
- Shake the ether layer with 10 ml of diluted NH4OH solution.
- Result: Formation of a rose red color in the ammoniacal layer indicates the presence of free anthraquinones.
Colophony (Resin)
- Residue obtained from distilling volatile oil from oleo-resin sources like Pinus palustris and other Pinus species (family Pinaceae).
- Used in various applications due to its resinous properties.
Test for Combined Umbelliferone
- Procedure:
- Mix 1 g of Asafoetida with 20 ml of a hydrochloric acid and water solution.
- Boil and filter the mixture into water alkaline with strong NH4OH solution.
- Result: Blue fluorescence indicates the presence of combined umbelliferone.
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Description
This quiz focuses on the solubility properties and chemical constituents of Aloe. Learn about the unique characteristics of Aloes, including its solubility in water and various solvents, as well as the key components such as barbaloin and aloe-emodin. Test your knowledge of Aloe's chemical makeup and its significance in various applications.
