The following is a natural emulsifying agent obtained from a vegetable source?

Appeared in: ISRO 2024

Explanation

Starch is a polysaccharide obtained from various plant sources, such as corn, potatoes, and rice, making it a vegetable-derived product.
It functions as a natural emulsifying and stabilizing agent by forming a protective layer around dispersed droplets, which prevents them from merging.
Unlike the other options, which are all derived from animal sources, starch is the only one that meets the 'vegetable source' criterion specified in the question.

Option A: Egg yolk is an effective natural emulsifier, but it is derived from an animal source (eggs), not a vegetable source.
Option B: Gelatin is a protein derived from animal collagen (bones, skin), making it an animal-sourced product.
Option C: Wool fat, also known as lanolin, is a waxy substance obtained from the wool of sheep, which is an animal source.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of natural emulsifying agents by source as background academic context rather than a clinical decision trigger.
Knowing the source of pharmaceutical excipients (inactive ingredients) like emulsifiers is critical for patient safety. It helps prevent allergic reactions in patients with sensitivities to eggs, animal products, or specific plants.
This knowledge is also important for catering to patients' dietary and ethical preferences, such as vegetarianism or veganism, when selecting or compounding medications.
What if? If a patient requiring a compounded oral suspension was a strict vegan, the pharmacist would have to avoid animal-derived agents like gelatin and choose a plant-based alternative like starch or acacia to ensure compliance and patient acceptance.

How to Approach the Question

First, dissect the question to identify the key requirements. The question asks for a 'natural emulsifying agent' that is specifically from a 'vegetable source'.
Next, evaluate each option against these two criteria.
Analyze Option A (Egg yolk): It is a natural emulsifier, but it comes from an animal. This fails the 'vegetable source' criterion.
Analyze Option B (Gelatin): It is used as a stabilizer, but it comes from animal collagen. This fails the 'vegetable source' criterion.
Analyze Option C (Wool fat): It is an emulsifier, but it comes from sheep's wool (an animal). This fails the 'vegetable source' criterion.
Analyze Option D (Starch): It is a natural substance used as an emulsifier/stabilizer, and it comes from plants (e.g., corn, potatoes). This meets both criteria.

Concept Tested & Keywords

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E6 Physiology Ganong 27e Vol 1 Part 1 p. 37-39

E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 165-167

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Attempt every question from this paper in a timed mock, then review the full solution for each one.