RH Herbal Formula Compounding 2 — Questions and Answers
Question 1: Which extraction method is most appropriate for isolating volatile oils from aromatic herbs?
- Cold maceration in water
- Steam distillation (Correct answer)
- Hot decoction
- Alkaline extraction
Correct answer: Steam distillation
Steam distillation efficiently separates volatile oils by using steam to carry them into a condensate without degrading heat-sensitive aromatic compounds.
Question 2: When compounding a formula for a client with a latex allergy, which herb should be used with caution?
- Echinacea purpurea
- Taraxacum officinale
- Ficus carica (Correct answer)
- Chamomilla recutita
Correct answer: Ficus carica
Ficus carica (fig) contains latex-like compounds and cross-reactivity with latex allergies has been documented.
Question 3: A tincture made with a 1:5 ratio means:
- 1 gram herb per 5 ml menstruum (Correct answer)
- 5 grams herb per 1 ml menstruum
- 1 part herb to 5 parts alcohol
- 5 parts herb to 1 part water
Correct answer: 1 gram herb per 5 ml menstruum
A 1:5 ratio indicates 1 gram of dried herb is extracted in 5 ml of menstruum, producing a weaker concentration than a 1:2 preparation.
Question 4: What is the primary purpose of adding a demulcent herb to a formula targeting the respiratory tract?
- To increase expectorant action
- To soothe and protect irritated mucous membranes (Correct answer)
- To stimulate immune activity
- To reduce fever through diaphoresis
Correct answer: To soothe and protect irritated mucous membranes
Demulcent herbs contain mucilaginous polysaccharides that coat and soothe irritated mucosal tissues, reducing inflammation and discomfort.
Question 5: Which solvent percentage is generally recommended for extracting alkaloids from plant material?
- 20–30% ethanol
- 40–60% ethanol
- 60–80% ethanol (Correct answer)
- 90–95% ethanol
Correct answer: 60–80% ethanol
Alkaloids are best extracted at 60–80% ethanol, which balances water solubility of alkaloid salts with ethanol's ability to penetrate cell walls.
Question 6: In a traditional Chinese Medicine-influenced formula, which category of herb typically occupies the 'minister' (chen) role?
- The herb addressing the root cause
- The herb amplifying or supporting the chief herb's action (Correct answer)
- The herb correcting formula imbalances
- The herb guiding the formula to a target organ
Correct answer: The herb amplifying or supporting the chief herb's action
The minister (chen) herb supports and enhances the chief (jun) herb's therapeutic action, often targeting a secondary aspect of the condition.
Question 7: Which factor most significantly affects the shelf life of a glycerite compared to an alcohol tincture?
- Glycerites have lower antimicrobial activity than high-proof ethanol tinctures (Correct answer)
- Glycerites require refrigeration to prevent crystallization
- Glycerites are more prone to oxidation due to their high sugar content
- Glycerites cannot extract fat-soluble constituents
Correct answer: Glycerites have lower antimicrobial activity than high-proof ethanol tinctures
Glycerin has lower antimicrobial preservative power than ethanol above 20%, making glycerites more susceptible to microbial growth and giving them a shorter shelf life.
RH Herbal Formula Compounding 2
Which extraction method is most appropriate for isolating volatile oils from aromatic herbs?