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Personal Care | Products |
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| Formulating with Masurf® G-2C |
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Products |
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| Masurf G-2C is a multifunctional co-surfactant for toiletries performing
as a thickener, foam booster, skin and hair moisturizer and emollient.
G-2C is a very mild and environmentally friendly ingredient for the
Personal Care Formulator that also functions to mitigate the irritation
profile of typical anionic surfactants used in Personal Care applications. |
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| Mildness
/ Irritation Reduction |
In addition to the reported OECD test data, in vitro methods like
the Zein Solubilization test related to skin irritation potential
or the Red Blood Cell test related to eye irritation, and Human Occlusive
Patch test at 48 hours demonstrate that Masurf G-2C is milder than
other well-known co-surfactants.
| Test Substance |
Zein
Solubilization1 Zein value (mg N/100ml) |
Red
Blood Cell2 Denaturization Index DI (%) |
48hr
Human Patch3 Irritation Index (%) |
| Masurf G-2C/SLES |
200 |
35 |
20 |
| Sodium Laureth Sulfate (SLES) |
280 |
65 |
55 |
| Sodium Lauryl Sulfate (SLS) |
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100 |
| Macat Ultra CG/SLES |
220 |
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| Macat W/SLES |
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30 |
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| Masamide CO/SLES |
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50 |
| Decyl Glucoside/SLES |
240 |
45 |
25 |
| Water |
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5 |
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Masurf G-2C:
Glycereth-2 Cocoate, Macat
Ultra GC: Cocamidopropyl Betaine, Macat W:
Sodium Cocamphoacetate, Masamide CO: Cocamide DEA
Column 1-
Zein solubilization in an aqueous solution of SLES + secondary surfactant
at 1:1 ratio. The concentration ofSLES is kept constant at 1% in the
test solutions.
Column 2 - Denaturation Index (DI) in an aqueous solution of SLES + secondary
surfactant at 1:1 ratio. The concentration of SLES is kept constant
at 1% in the test solutions.
Column 3 - Irritation index in 48 h Occlusive Human Patch test, in an aqueous
solution of SLES + secondary surfactant at 1:1 ratio. The concentration
of SLES is kept constant at 2% in the test solutions. Values are expressed
as % of average scores, 48 h after patch removal related to the score
obtained for SLS. |
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| Thickening
Ability |
llustrated in the figure 1, 2% active co-surfactant was added to a
10% active SLES solution with increasing concentration of Sodium Chloride
and viscosity determined. The thickening effect of Masurf G-2C is
similar to that of Cocamide DEA (CDEA), but with the advantage of
being nitrogen free and nitrosamine free, and being much more effective
than Decyl Glucoside (APG).
Figure 1
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| Foaming Ability |
llustrated
in the figure 2, 2% active co-surfactant was added to a 10% active
SLES solution with foaming ability measured by the Ross Miles (DIN
53902) method. Masurf G-2C is a good foam booster and stabilizer,
improving creaminess and making foam more pleasant during application.
It is comparable to the most used co-surfactants, even in the presence
of sebum oils. G-2C: Masurf G-2C (glycereth-2 cocoate), CDEA: Masamide
CO (cocamide DEA), APG: Decyl glucoside, CAPB: Macat Ultra CG (cocamidopropyl
betaine)
Figure 2
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| Moisturizing Effect |
The moisturizing
effect of glycerine and its derivatives are well known. The moisturizing
ability of Masurf G-2C was compared to two different emollients, PEG-7
Glyceryl Cocoate (G-7C) and PEG-6 Caprilic/Capric Glycerides (G-6C/C)
in a simple composition containing 10% of emollient, 1.5% Polysorbate
60, 0.5% Sorbitan Monostearate and water. In this illustration glycerin
was considered as positive control and water as negative control.
After application on the same area 2 times a day for two weeks, conductance
was measured. Masurf G-2C showed better effectiveness compared to
the other emollients.
Figure 3
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Formulation
Considerations
It is important to point out that Masurf G-2C is only water dispersible.
To maintain low temperature formulation clarity, it is recommended
to maintain a ratio of anionic/G-2C to above 10 to 3 (active), or
to add other co-surfactants such as Macat Ultra CDO (Cocamidopropylamine
Oxide) or Macat LHS (Lauryl Hydroxysultaine). In the examples below,
the two thickeners, PEG-150 Distearate and PEG-120 Methyl Glucose
Dioleate (A)
are substituted with 2% of Masurf G-2C, resulting in a similar baby
shampoo in viscosity, foaming ability, and mildness, but with an increased
cloud point (8°C vs. -10°C). Replacing Macat W (Sodium Cocoamphoacetate)
(B) with
Macat Ultra LHS or Macat Ultra CDO results in two final baby shampoos
(C and D) with
similar properties and low temperature clarity. Most notably, the
use of PEG 150 Distearate, with its melting point and solubilizing
issues can be avoided.
| Baby Shampoo
Components |
A |
B |
C
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D |
| Water |
q.s. to 100% |
q.s. to 100% |
q.s. to 100% |
q.s. to 100% |
| Sodium Lauryl Ether Sulfate, 27% |
8.0 |
8.0 |
8.0 |
8.0 |
| Polysorbate 20 |
1.0 |
1.0 |
1.0 |
1.0 |
| PEG 150 Distearate |
1.2 |
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| PEG-120 Methyl Glucose Dioleate |
1.5 |
0.2 |
0.6 |
1.0 |
| Macat W |
15.0 |
15.0 |
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| Macat LHS |
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13.0 |
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| Macat
Ultra CDO |
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16.5 |
| Masurf
G-2C |
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2.0 |
2.0 |
2.0 |
| Viscosity @20°C, cPs |
1360 |
700 |
2470 |
3300 |
| Cloud Point, °C |
-10 |
8 |
-6 |
-10 |
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MAC v.063004 |
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