6 Questions
What is the primary source of caffeine?
Coffee arabica
What is the pharmacological activity of theobromine?
Vasodilator, bronchodilator, and diuretic
Which of the following alkaloids is not derived from amino acids?
Purine alkaloids
What is the result of Mayer's test on alkaloids?
Creamy white ppt
Which of the following is a true alkaloid?
Papaverine
What is the primary use of theophylline?
Relief of bronchospasm and COPD
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.
Test your knowledge of alkaloids with this quiz, covering topics such as true alkaloids, protoalkaloids, pseudoalkaloids, and purine alkaloids. Identify and classify different types of alkaloids, including quinine, atropine, and caffeine.
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