NURSING EXAM QUESTIONS
PHARMACOGNOSY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Do not answer to gold beater skin test
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Pseudotannins
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hydrolysable tannins
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Non-hydrolyzable tannins
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Complex tannins
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Explanation:
Detailed explanation-1: -Pseudotannins are simple phenolic compounds of lower molecular weight. They do not respond to the tanning reaction of Goldbeater’s skin test. Gallic acid, Chlorogenicacid, or the simple phenolics such as catechin are pseudotannins which are abundantly found in plants, especially in dead tissues and dying cells.
Detailed explanation-2: -Goldbeater’s skin test: The skin piece is washed with distilled water and kept in a solution of ferrous sulphate. A brown or black colour is produced on the skin due presence of tannins.
Detailed explanation-3: -pseudotannin (plural pseudotannins) Any of a diverse group of low-molecular weight compounds (such as gallic acid) that have some similarities to the tannins.
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