Guideline Formulas for Water-Based Mosquito Repellent Spray (Euca-Kill, IR3535, Grapefruit Oil)
Question
Could you please provide guideline formulations for a 1-liter (1000g) water-based mosquito repellent spray? The formulation should be divided into three separate formulas, each using a different primary active ingredient, and should assume the use of a homogenizer during the mixing process to ensure clarity and stability.
The three required formulas are:
- Formula using Euca-Kill (e.q. Citriodiol/PMD) as the main active.
- Formula using IR3535 as the main active.
- Formula using Grapefruit oil as the main active.
There are no specific constraints regarding pH, natural certification, or vegan status.
Answer
Guideline Formulations for Water-Based Mosquito Repellent Spray (1 Liter)
These are guideline formulations for a 1-liter (1000g) water-based mosquito repellent spray, utilizing a homogenizer for mixing to ensure stability and clarity.
Formula 1: Euca-Kill™ (e.q. Citriodiol)
This formula uses a high concentration of Euca-Kill™ (PMD) for effective, long-lasting protection. A high ratio of solubilizer is necessary to incorporate the oil-based active into the water phase.
| Ingredient | Function | % w/w | Grams (for 1000g) |
|---|---|---|---|
| Phase A (Oil/Active) | |||
| Euca-Kill™ (ID 1126) | Active Repellent (PMD) | 18.0% | 180.0 g |
| Polysorbate 20 (or PEG-40 HCO) | Solubilizer | 40.0% | 400.0 g |
| Phase B (Water) | |||
| Propylene Glycol | Co-solvent/Humectant | 5.0% | 50.0 g |
| Preservative (e.g., Phenoxyethanol) | Preservative | 0.5% | 5.0 g |
| Deionized Water | Base | QS to 100% | 365.0 g |
| TOTAL | 100.0% | 1000.0 g |
Mixing Procedure (Using Homogenizer):
- Phase A: Combine Euca-Kill™ and Polysorbate 20. Mix thoroughly until the mixture is completely clear and uniform.
- Phase B: In a separate container, mix Propylene Glycol, Preservative, and Deionized Water.
- Combination: Slowly add Phase B into Phase A while mixing with the homogenizer (or high-shear mixer) until the final product is clear and stable.
Formula 2: IR3535
IR3535 is generally easier to incorporate into a water base than essential oils, but a co-solvent like Propylene Glycol is recommended for optimal clarity and stability.
| Ingredient | Function | % w/w | Grams (for 1000g) |
|---|---|---|---|
| Phase A (Active/Solvent) | |||
| IR3535 | Active Repellent | 15.0% | 150.0 g |
| Propylene Glycol | Co-solvent/Solvent | 10.0% | 100.0 g |
| Polysorbate 20 (Optional) | Solubilizer | 5.0% | 50.0 g |
| Phase B (Water) | |||
| Preservative (e.g., Phenoxyethanol) | Preservative | 0.5% | 5.0 g |
| Deionized Water | Base | QS to 100% | 695.0 g |
| TOTAL | 100.0% | 1000.0 g |
Mixing Procedure (Using Homogenizer):
- Phase A: Combine IR3535, Propylene Glycol, and Polysorbate 20 (if used). Mix until the IR3535 is fully dissolved.
- Combination: Add the Preservative to Phase A. Slowly add Deionized Water while mixing with the homogenizer until the solution is clear and uniform.
Formula 3: Grapefruit Oil
This formula relies on the natural repellent properties of Grapefruit essential oil. A solubilizer is essential to prevent separation of the oil in the water base.
| Ingredient | Function | % w/w | Grams (for 1000g) |
|---|---|---|---|
| Phase A (Oil) | |||
| Grapefruit Oil | Active Repellent/Fragrance | 2.0% | 20.0 g |
| Polysorbate 20 (or PEG-40 HCO) | Solubilizer | 8.0% | 80.0 g |
| Phase B (Water) | |||
| Propylene Glycol | Co-solvent/Humectant | 5.0% | 50.0 g |
| Preservative (e.g., Phenoxyethanol) | Preservative | 0.5% | 5.0 g |
| Deionized Water | Base | QS to 100% | 895.0 g |
| TOTAL | 100.0% | 1000.0 g |
Mixing Procedure (Using Homogenizer):
- Phase A: Combine Grapefruit Oil and Polysorbate 20. Mix thoroughly until the oil is completely solubilized and the mixture is clear.
- Phase B: In a separate container, mix Propylene Glycol, Preservative, and Deionized Water.
- Combination: Slowly add Phase B into Phase A while mixing with the homogenizer until the final product is clear and uniform.
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