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Stuttgart, Germany

Meinke M.C.,Charite - Medical University of Berlin | Richter H.,Charite - Medical University of Berlin | Kleemann A.,Klosterfrau Berlin GmbH | Lademann J.,Charite - Medical University of Berlin | And 3 more authors.
Journal of Biomedical Optics | Year: 2014

Atopic dermatitis (AD) is a multifactorial inflammatory skin disease that affects both children and adults in an increasing manner. The treatment of AD often reduces subjective skin parameters, such as itching, dryness, and tension, but the inflammation cannot be cured. Laser scanning microscopy was used to investigate the skin surface, epidermal, and dermal characteristics of dry and atopic skin before and after treatment with an ointment rich in hyperforin, which is known for its anti-inflammatory effects. The results were compared to subjective parameters and transepidermal water loss, stratum corneum moisture, and stratum corneum lipids. Using biophysical methods, in particular laser scanning microscopy, it was found that atopic skin has distinct features compared to healthy skin. Treatment with a hyperforin-rich ointment resulted in an improvement of the stratum corneum moisture, skin surface dryness, skin lipids, and the subjective skin parameters, indicating that the barrier is stabilized and improved by the ointment. But in contrast to the improved skin surface, the inflammation in the deeper epidermis/dermis often continues to exist. This could be clearly shown by the reflectance confocal microscopy (RCM) measurements. Therefore, RCM measurements could be used to investigate the progress in treatment of atopic dermatitis. © 2015 Society of Photo-Optical Instrumentation Engineers (SPIE). © 2015 SPIE. Source


Meinke M.C.,Charite - Medical University of Berlin | Schanzer S.,Charite - Medical University of Berlin | Haag S.F.,Charite - Medical University of Berlin | Casetti F.,Albert Ludwigs University of Freiburg | And 5 more authors.
European Journal of Pharmaceutics and Biopharmaceutics | Year: 2012

Hyperforin, a major constituent of St. John's Wort (Hypericum perforatum, HP), provides anti-inflammatory, anti-tumor, and anti-bacterial properties. Previous studies have shown anti-oxidative properties of St. John's Wort extracts; however, its free radical scavenging activity in skin cells or skin has not been assessed in detail so far. Therefore, the free radical scavenging activity of hyperforin was tested in the H2DCFDA-assay in vitro in HaCaT keratinocytes irradiated with solar simulated radiation. Hyperforin (EC50 0.7 μM corresponding to 0.42 μg/ml) was much more effective compared to Trolox (EC50 12 μg/ml) and N-acetylcysteine (EC50 847 μg/ml) without showing phototoxicity. The radical protection factor of a cream containing 1.5% w/w of a hyperforin-rich HP extract was determined to be 200 × 1014 radicals/mg, indicating a high radical scavenging activity. The cream was further applied ex vivo on porcine ear skin and significantly reduced radical formation after infrared irradiation. Finally, the UV-protective effect of the HP cream was tested on 20 volunteers in a randomized, double-blind, vehicle-controlled study. HP cream significantly reduced UVB-induced erythema as opposed to the vehicle. Occlusive application of HP cream on non-irradiated test sites did not cause any skin irritation. Taken together, these results demonstrate that hyperforin is a powerful free radical scavenger. © 2012 Elsevier B.V. All rights reserved. Source


Arndt S.,Charite - Medical University of Berlin | Haag S.F.,Charite - Medical University of Berlin | Kleemann A.,Klosterfrau Berlin GmbH | Lademann J.,Charite - Medical University of Berlin | Meinke M.C.,Charite - Medical University of Berlin
Experimental Dermatology | Year: 2013

The formation of radicals plays an important role in the development of atopic eczema or barrier-disrupted skin. We evaluated the radical scavenging effect of a cream containing a Hypericum perforatum extract rich in hyperforin in a double-blind placebo-controlled study on 11 healthy volunteers. Electron paramagnetic resonance spectroscopy was applied to determine radical formation during VIS/NIR irradiation of the inner forearm. The results were compared to ex vivo investigations on excised porcine ear skin after a single application of the creams. The non-treated skin was measured as control. The absolute values and the kinetics are not comparable for ex vivo and in vivo radical formation. Whereas in vivo, the radical production decreases with time, it remains stable ex vivo over the investigated timescale. Nevertheless, ex vivo methods could be developed to estimate the protection efficiency of creams. In vivo as well as ex vivo, the radical formation could be reduced by almost 80% when applying the hyperforin-rich cream onto the skin, whereas placebo resulted in about 60%. In vivo, a daylong protection effect could be validated after a 4-week application time of the cream indicating that a regular application is necessary to obtain the full effect. © 2013 John Wiley & Sons A/S. Source


Haag S.F.,Charite - Medical University of Berlin | Tscherch K.,University of Hamburg | Arndt S.,Charite - Medical University of Berlin | Kleemann A.,Klosterfrau Berlin GmbH | And 4 more authors.
European Journal of Pharmaceutics and Biopharmaceutics | Year: 2014

Hyperforin is well-known for its anti-inflammatory, anti-tumor, anti-bacterial, and antioxidant properties. The application of a hyperforin-rich verum cream could strengthen the skin barrier function by reducing radical formation and stabilizing stratum corneum lipids. Here, it was investigated whether topical treatment with a hyperforin-rich cream increases the radical protection of the skin during VIS/NIR irradiation. Skin lipid profile was investigated applying HPTLC on skin lipid extracts. Furthermore, the absorption- and scattering coefficients, which influence radical formation, were determined. 11 volunteers were included in this study. After a single cream application, VIS/NIR-induced radical formation could be completely inhibited by both verum and placebo showing an immediate protection. After an application period of 4 weeks, radical formation could be significantly reduced by 45% following placebo application and 78% after verum application showing a long-term protection. Furthermore, the skin lipids in both verum and placebo groups increased directly after a single cream application but only significantly for ceramide [AP], [NP1], and squalene. After long-term cream application, concentration of cholesterol and the ceramides increased, but no significance was observed. These results indicate that regular application of the hyperforin-rich cream can reduce radical formation and can stabilize skin lipids, which are responsible for the barrier function. © 2013 Elsevier B.V. All rights reserved. Source


Patent
Klosterfrau Berlin GMBH | Date: 2012-03-21

The invention relates to a method for thermal sterilization in particular of a container filled with medical material or product, the method comprising a sterilization method step in which a thermal sterilization in particular is carried out of a container filled with medical material or product in the presence of a sterilization atmosphere, containing steam, at temperatures of at least 100 C. and at increased pressure, wherein the sterilization method step comprises at least a first method stage and a second method stage, following the first method stage, with first and second method stages being carried out at different pressures with respect to one another, the pressure in the second method stage being increased relative to the pressure in the first method stage.

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