Formulation Issues and Adjustments for Whitening and Oil Control Cream
Question
I am developing a whitening and oil control formula, likely an O/W emulsion. My original formula had a high oil phase percentage (15.5g in 50g total). I have some questions regarding specific ingredients and stability:
- Is using
Perfect-C(Ascorbyl Tetraisopalmitate) at 5g in only 10ml of the oil phase too much, potentially causing the formula to separate? - Is
Perfect-Cacidic and can it damage other ingredients in the formula? - Is it necessary to add
Disodium EDTAto the water phase even thoughPerfect-Cis oil-soluble? - Is
Activated Resorcinol(4-Butyl Resorcinol) only soluble inLipidSoft, or can it dissolve in other oils as well? - What is the correct procedure for mixing
Activated Resorcinolpowder into the oil phase? Should it be pre-dissolved in a small amount of oil before adding to the main oil phase?
I plan to reduce the Perfect-C amount to 2g based on the feedback about the oil phase quantity.
Answer
Formulation Advice for Whitening and Oil Control Formula
Based on your formulation and the expert advice provided, here are the answers to your questions:
Perfect-C Quantity: You are correct that 5g of Perfect-C in only 10ml of the oil phase is likely too much and will cause the formula to separate. Reducing the amount, as you plan to do, is a good step to improve stability.
Perfect-C Acidity: Perfect-C (Ascorbyl Tetraisopalmitate) is an oil-soluble form of Vitamin C. It is not acidic and will not damage other ingredients in your formula. Your understanding is correct.
EDTA for Perfect-C: Even though Perfect-C is in the oil phase, it is still recommended to add Disodium EDTA to the water phase of your formula. This helps to chelate metal ions that could potentially affect the stability of ingredients in both phases.
Activated Resorcinol Solubility: Activated Resorcinol (4-Butyl Resorcinol) is soluble in oil. While the product page may specifically mention LipidSoft, it can dissolve in other types of oil as well.
Mixing Activated Resorcinol in the Oil Phase: The correct procedure for mixing Activated Resorcinol is to first dissolve the powder in a suitable oil (like Perfect-C or another oil in your oil phase) before incorporating it into the main oil phase of your formula. Since Activated Resorcinol is oil-soluble, it will dissolve in the oil phase without needing heat. Dissolving it in a small amount of oil first helps ensure it is fully dispersed before adding it to the larger oil phase.
Additionally, please note the expert's advice that the total percentage of the oil phase in your original formula (15.5g oil phase in 50g base) is quite high and increases the risk of separation. Adjusting the overall oil content might be beneficial for formula stability.
Your plan to reduce Perfect-C to 2g is a positive step based on the feedback regarding the oil phase quantity.
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