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126 DEODORANTS


them, one Petri dish was filled with certain amounts (the same for all three experiments) of a compound giving an unpleasant odour. The measurement of its gas concentration was carried out 10 minutes after closing the system. In the first experiment, the second Petri dish remained empty. In the second test, it was filled with water. In the final third, a certain amount of the solution of the tested odour absorber, for instance diluted odour absorber concentrate (30 MT), was added. The use of a 30% diluted solution of the odour absorber concentrate (30 MT) for the absorption of nitrogen and sulfur containing compounds of above system shows a reduction of the diethylamine concentration in the system from 200 to 74 ppm, i.e. more than 63% (Fig 5). The absorption efficiency of ethanethiol is even higher, almost 77%, herewith the concentration decreases from 35 to 8 ppm. Figure 6 shows the ability of two market


products to absorb hydrogen sulfide. A cream soap and a detergent containing another type of odour absorber, have been tested without and with the addition of 30 MT. For the first product, the concentration of hydrogen sulfide could be decreased by 6.5 times from 400 to 60 ppm by using 30 MT. Absorption rates of the second product in the presence of 30 MT improved from 50% to almost 100%, that only 12 ppm of hydrogen sulfide remained in the system. Comparison of the performance of the odour absorber concentrate products (25 GP and 30 MT) and a competitive product also based on zinc ricinoleate for the absorption of ammonia, hydrogen sulfide and acetic acid confirms the special effectiveness of Schill+Seilacher GmbH products. Efficiency was calculated by the formula:


efficiency (%)=100%–


residual concentration of “bad smell” substance in the presence of an odor absorber


initial concentration of “bad smell” substance, “Blank”


As shown in the diagram (Fig 7), the


efficiency of the odour absorber concentrate products for ammonia absorption reaches 65%, while the competitive product gives 45%. Hydrogen sulfide is removed by 25 GP and 30 MT by 80% and 90%, respectively. But for the competitive product, 68% can be achieved. Only in the case of acetic acid, the efficiency for all three products fluctuates within the measurement error. Schill+Seilacher GmbH developed a basic deodorant formulation with 25 GP (Table 2). A similar test was carried out for this formulation with and without the odour absorber concentrate as well as for two commercial available deodorants containing zinc ricinoleate (Fig 8). The presence of zinc ricinoleate in the tested


PERSONAL CARE EUROPE


40 35 30 25 20 15 10 5 0


35 30 H3 CSH x100%


Gasphase H2


S LIGAND L1 OH Sn- Figure 4: Self-assembly of the complex on the surface of the solution. H3 250 200 200 150 100 50 0 Blank 2 ml Water 2 ml 30% Polyfix ZRC 30 74 194


CCH3 H


N I Me2+ LIGAND L2 H2


O OH


8 Blank 2 ml Water 2 ml 30% Polyfix ZRC 30 MT


Figure 5: Absorption of diethylamine (top) and ethanethiol (bottom) by 30% diluted solution of Polyfix ZRC 30 MT.


April 2020


Ethanethiol (ppm) Diethylamine (ppm)


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