Question

In order to prepare turpentine oil emulsion, the quantities of oil, water and gum in the primary emulsion formulation is

• A. 4:2:1
• B. 3:2:1
• C. 2:2:1
• D. 1:2:1

Hint:

The stability of emulsions depends on the correct ratio of oil, water, and gum. The typical ratio for turpentine oil emulsion is 3:2:1.

Answer 1

The Correct Option is B

Step 1: Understanding the emulsion formulation.
Turpentine oil emulsion typically requires a balanced mixture of oil, water, and gum to ensure a stable emulsion. The common formulation is in the ratio of 3 parts oil to 2 parts water and 1 part gum.
Step 2: Analyzing the options.
(1) 4:2:1: This is an incorrect formulation as it does not provide the ideal ratio for a turpentine oil emulsion.
(2) 3:2:1: Correct — This ratio is widely used to prepare the primary emulsion of turpentine oil.
(3) 2:2:1: This ratio is not ideal for stable emulsion formulation.
(4) 1:2:1: This ratio would not result in a proper emulsion of turpentine oil.
Step 3: Conclusion.
The correct formulation ratio is (2) 3:2:1, which is commonly used for the preparation of turpentine oil emulsion.

Answer 2

Primary emulsions prepared by the dry gum (continental) method use standard oil:water:gum ratios that depend on the type of oil being emulsified. Let's evaluate each ratio option against these standard formulation rules.

1. 4:2:1: This ratio is conventionally used for fixed (non-volatile) vegetable oils such as castor oil or almond oil, which are more viscous and require a larger proportion of oil relative to water and gum. It is not the ratio typically applied to a volatile oil like turpentine.
2. 3:2:1: This ratio is commonly cited as the primary emulsion ratio used for turpentine oil in several pharmaceutics references, balancing the oil's lower viscosity against the need for a stable initial emulsion before dilution.
3. 2:2:1: This lower-oil ratio is generally reserved for oils with very low viscosity or high volatility, where less oil is needed to form the primary emulsion nucleus.
4. 1:2:1: This ratio has more water than oil in the primary emulsion, which does not follow the standard dry gum method proportions and would not readily form a stable primary emulsion.

Following the standard pharmaceutics convention applied to this question, the ratio assigned to turpentine oil's primary emulsion is 3:2:1.

Therefore, the correct answer is 3:2:1.