Home Cosmetic Science Talk Formulating Chelating Agent Recommendation

  • Chelating Agent Recommendation

    Posted by Ron_93 on February 7, 2024 at 11:12 pm

    Hey everyone,

    I hope you all are well and in great spirits. I am looking for chelating agent usage rate recommendation for a hair conditioner formula. I know Disodium EDTA is the standard, but was curious regarding usage rate as I was under the impression that it cannot be used in cationic environments. Is GDLA an option if I cannot use EDTA? Thank you in advance.

    Phase A:

    Water-qs

    Sodium Benzoate-0.3%

    cationic guar- 0.15%

    Phase B:

    Btms-50- 2%

    cetearyl alcohol 30/70- 5%

    Phase C:

    Euxyl pe 9010- 1%

    Hydrolyzed rice protein 3%

    Fragrance- 0.3%

    Ron_93 replied 4 months, 2 weeks ago 2 Members · 2 Replies
  • 2 Replies
  • Graillotion

    Member
    February 8, 2024 at 2:23 am

    I think EDTA and GLDA have the same number of negative charges, unlike something like sodium phytate. I guess the concern would be precipitants…and if they form, which can be verified with testing.

    The way I understood chelates and cationics from my mentor was….use the ones with the fewest negative charges…and use them at very very low rates.

    Here is a snippet from him…when we were hashing through a formula with Varisoft Eq:

    Phytic acid has up to 12 negative charges which is three times that of TSGD or EDTA. It’s a cationics nightmare. The others may actually work because they’re added in traces compared to the cationic ingredient. From a chemistry perspective, it’s unlikely that a TSGD-Varisoft complex forms which precipitates. Most likely, there will be electrostatic interactions between the two but nothing which you could feel or see, just the kind which potentially reduces long-term stability.

    He leaned towards using GLDA at ultra low rates.

    Good luck.

  • Ron_93

    Member
    February 8, 2024 at 6:17 am

    Roger that! Thank you.

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