NeilL
Forum Replies Created
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Belassi said:Seems unlikely to me. That is quite a low usage level. You can easily test your idea by replacing it with sodium benzoate which is commonly used in soft drinks and will not discolour your product over time. Actually one of my MBA students is responsible for a major brand of sports drink over here, so I am well aware of the typical formula. And why is sodium chloride in there without potassium chloride?Why would I require Potassium Chloride in there as well? Thanks for the suggestion I shall replace it for now but I know the customer doesn’t want Benzoate in there due to some concern over the formation of benzene with vitamin C present.
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Herbnerd said:I suspect you are dropping the hyaluronic acid below the isoelectric point and precipitating the proteins.
For general stability, you ideally need a pH of between 3.6-4.2
Thanks for this however I had a similar idea so ran a knockout experiment without the sodium Hyaluronate and the solids still formed. Thanks for the suggestion though its really appreciated!!
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The other issue with carbomers is when they absorb water their weight increases. This means you end up putting less in but depending on addition size and batch quantities it shouldn’t have a major impact. Lubrizol recommended doing a Loss on drying for their product to me and recommended if that was above 2% I should dry the product prior to weighing.
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@MurtazaHakim I’m not sure what you mean by ‘How are the components with their exact percentages identified???’
C12-C14 PAS is the Primary Alkyl Sulfonate of chain length C12-C14 which is dodecyl sulfonate (Usually the sodium salt form)
C12-C16 Alkyl Dimethyl amine oxide is Lauramine Oxide
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What preservative are using?
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Hi Mark,
That is my question as well!! Customers who would have them haha!
Thanks for the suggestion I’ll try and find a sample of this
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For a water in oil emulsion you want a high HLB value emulsifier. You can calculate the required HLB value of the oil component. This varies depending on what you type of oil and the percentage it makes of the oil phase. From this required value you should be able to find an emulsifier that matches your requirement. If not you can always mix a low and high HLB emulsifier. This system has the added benefit of being miscible in both the oil and water phase and should help to produce a more stable emulsion.
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I haven’t worked with Microcare SB before but looking at the product it is a mixture of sodium benzoate and potassium sorbate. Both of these are stable at an increased temperature so they should be fine to be heated up. However I am not sure if this will change the affect they are having on the skin.
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It is water soluble however you should add it after heating. Add it below 40 degrees Celsius during a cool down phase.
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Here are a few links I use quite often for help.
https://www.happi.com/contents/list_formulary/
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First search result on google..
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I have attached a document I use for HLB values of Oils. However I have not heard of a difference in HLB values of oils for w/o and o/w emulsions before so I can’t help there.
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Is your product going to be an emulsion? If not I don’t think you need to worry about the HLB values of these surfactants. You only need to think about the HLB value when you are trying to form an emulsion.
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HLB is a good starting point when it comes to selecting emulsifiers. However this is not the only factor in making a stable emulsion. A stable emulsion is one where the continuous phase (in your example the water phase) has a large viscosity. This helps to stabilize the dispersed droplets of oil as it prevents coalescence of the droplets. Also if the density of the continuous and the dispersed are equivalent this also helps stability. HLB theory is exactly that a theory to help provide a starting point however there are many more factors to forming a stable emulsion.
I hope this helps you
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It’s a Chemist attempt at a poor joke! ‘Argon’ sounds like ‘are gone’…..