48 TRENDING TECHNOLOGIES
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Day 1 Day 5
Figure 4: The influence of rice starch on the skin barrier (TEWL) of a normal skin
small particle size of 2-8 µm. The particles are quite hard, and the pore volume makes up 67% of the total particle volume. A 1% solution of rice starch in water cleans the skin as well as a 1% solution of SLS in water (Figure 3). The cleaning mechanism is different from
surfactants. The hard particles scrub the dirt away from the skin’s surface. Dirt is also absorbed by the particle’s surface and into the pores. As the particles are so small, the hardness is not noticed by the user. On the other hand, the particles are too
large to penetrate between the corneocytes, as the maximum distance between two corneocytes is only 30 nm. Therefore, this rice starch, unlike surfactants cannot remove skin lipids or sebum in the stratum corneum. This particular rice starch only removes what is on the skin surface such as dirt, excess sebum, and clusters of corneocytes visible as flakes. The skin is left clean and smooth. The skin barrier is unaltered as proofs the following experiments.
TEWL experiments The following two experiments on 12 volunteers were conducted to support the beneficial effect on the skin barrier when a
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Day 1 Day 5
Figure 5: The influence of rice starch on the skin barrier (TEWL) of a SLS- damaged skin
particular rice starch was used to clean the skin.2
Persons suffering from atopic dermatitis The volunteers had normal to slightly dry
skin. Their skin was soaked in a 1% solution of rice starch twice a day for 15 minutes and for five days. The effect on healthy skin is shown in
Figure 4. The initial TEWL was set to 100%. It is clear that rice starch had no destructive effect on the skin barrier; the TEWL remains unaltered.
When the skin was damaged with SLS
before the experiment, the cleaning with rice starch even led to a reduction of the TEWL. This means that the skin barrier even recovered. After five days, TEWL has diminished with 20% (Figure 5). The explanation for this result is that SLS-damaged skin has a seriously impaired skin barrier. The particular rice starch does not remove any amount of skin lipids during the cleaning process and therefore the skin has the time to recover. Another experiment was performed on
12 patients suffering from atopic dermatitis. Atopic dermatitis is a chronicle inflammation skin disease that is caused by a defect in the proper keratinization process of the keratinocytes in the stratum granulosum.
TEWL■ Lessions ■
120% 100% 80% 60% 40% 20% 0%
Figure 6: The influence of rice starch on the skin barrier (TEWL) of an atopic skin Day 1
Day 5 PERSONAL CARE May 2024
have an impaired barrier and therefore an elevated TEWL compared to healthy persons. When the skin was soaked twice a day in a 1% solution of rice starch for five days, the skin had time to recover. In this test, the TEWL also diminished by 20% after five days (Figure 6). The reduction in TEWL, or the improvement
of the skin barrier had a clear visible effect as the eczematous lesions diminished by 30%. This was evaluated by a dermatologist.
Conclusion The well-established habit of using surfactant- based products to clean the skin has an undeniable destructive effect on our skin barrier. Even the use of mild surfactant-based products, such as Lauryl glucoside destroys slowly but surely the skin. The skin needs to be cleaned to remove
pathogens and dirt. Cleaning is an essential part of skin care to keep the skin beautiful, healthy and intact. Paradoxically, surfactants which are supposed to do this, are also destroying the skin barrier in the long term. Dry skin, baby skin, elderly skin, eczema
skin or sensitive skin already are suffering from an impaired skin barrier. Surfactants only make it worse. A novel natural solution is to use a
particular rice starch (Remytec® FI) that only removes what is on the skin and does not remove the precious skin lipids deeper in the stratum corneum. Cleaning the skin with rice starch does not
influence the TEWL and reduces even the TEWL in damaged skin types. In other words, the skin barrier is not damaged by rice starch and it can even help to recover the damaged skin.
PC
References 1. Fujimura et al. Changes in Hydration of the Stratum Corneum are the Most Suitable Indicator to Evaluate the Irritation of Surfactants on the Skin. Skin Res. Technol. 2017; 23 (1) 97–103
2. De Paepe et al. Effect of Rice Starch as a Bath Additive on the Barrier Function of Healthy but SLS-damaged and Skin of Atopic Patients. Acta. Derm. Venereol. 2002; 82 184–186
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(TEWL and number of lessions in %)
(TEWL In %)
(TEWL In %)
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