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Questions and Answers
What is the primary source of caffeine?
What is the primary source of caffeine?
- Camellia sinensis
- Theobroma cacao
- Sterculaceae
- Coffee arabica (correct)
What is the pharmacological activity of theobromine?
What is the pharmacological activity of theobromine?
- CNS stimulant and vasoconstrictor
- Vasodilator, bronchodilator, and diuretic (correct)
- CNS depressant and antispasmodic
- Smooth muscle relaxant and bronchodilator
Which of the following alkaloids is not derived from amino acids?
Which of the following alkaloids is not derived from amino acids?
- Purine alkaloids (correct)
- Atropine
- Caffeine
- Quinine
What is the result of Mayer's test on alkaloids?
What is the result of Mayer's test on alkaloids?
Which of the following is a true alkaloid?
Which of the following is a true alkaloid?
What is the primary use of theophylline?
What is the primary use of theophylline?
Flashcards
What is the main source of caffeine?
What is the main source of caffeine?
A type of coffee bean that is the primary source of caffeine.
What is theobromine's pharmacological activity?
What is theobromine's pharmacological activity?
Theobromine acts as a vasodilator, bronchodilator, and diuretic in the body.
Which alkaloid is NOT derived from amino acids?
Which alkaloid is NOT derived from amino acids?
Purine alkaloids are not derived from amino acids, unlike most other alkaloids.
What is the result of a positive Mayer's test?
What is the result of a positive Mayer's test?
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Which of these is a true alkaloid?
Which of these is a true alkaloid?
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What is the main use of theophylline?
What is the main use of theophylline?
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Study Notes
Alkaloids Classification
- True alkaloids: Quinine, Atropine, Strychnine, Caffeine, Papaverine
- Protoalkaloids: Not mentioned
- Pseudoalkaloids: Purine alkaloids (not derived from amino acids)
Purine Alkaloids
- Derived from xanthine
- Methylated derivatives of xanthine
- Examples: Caffeine, Theobromine, Theophylline
Caffeine
- Obtained from: Coffee arabica (Rubaceae), tea, cola
- Pharmacological activity:
- CNS stimulant, enhancing alertness
- Vasoconstrictor, enhancing analgesics effects
- In pulmonary complications in premature birth
Theobromine
- Obtained from: Theobroma cacao (Sterculaceae)
- Pharmacological activity:
- Increases mood and motivation
- Less CNS stimulant
- Vasodilator, bronchodilator, diuretic
- Used in treatment of angina pectoris and hypertension
Theophylline
- Obtained from: Camelia sinensis (Theaceae)
- Pharmacological activity:
- Smooth muscle relaxant, relieving bronchospasm
- Reliefs asthma and chronic obstructive pulmonary disease (COPD)
General Chemical Tests
- Mayer's test: No creamy white ppt.
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