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Gluconolactone & Sodium Benzoate/Geogard Ultra
I received a sample of GSB for testing, which I’ve been using at 1.5% for a shampoo formula. This formula is normally clear, but when I use GSB, it comes out opaque. There isn’t any phase separation or precipitation, so it looks relatively stable, but I’d prefer if it were clear. After some trial and error, it appears to be a solubility issue. I’ve noticed that the formula is clear up until the point I add salt for thickening (1-2%). Normally, this formula readily accepts salt for thickening, but not in the presence of GSB. Any thoughts as to what I can do to clarify the solution? General process is as follows:
1. Under agitation (magnetic stirrer), slowly add cationic guar to water
2. Adjust pH to 3.5-5 with citric acid
3. Continue mixing for ~15 minutes
4. While mixing, add GSB to water
5. Heat solution to 60-65C
6. Add anionic surfactants, mix
7. Add other surfactants, mix
8. Add other non heat sensitive ingredients, mix
9. Allow to cool to <50C
10. Add cool-down phase ingredients (fragrance), mix
11. Adjust pH with citric acid to ~5.4
12. Add salt for thickening <- product becomes opaque w/GSB
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