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Skin Care
New in Skin Care (page 7 of 21)
Sep 01, 2011 | 01:39 PM CDT
The Photostability and Photostabilization of trans-Resveratrol
By: Craig Bonda, Jean Zhang and Anna Pavlovic, The…
In this study, the effects of ultraviolet radiation (UVR) on trans-resveratrol were documented, finding that UV radiation causes it to undergo rapid and extensive photoisomerization and some photodecomposition. The antioxidant activity of trans-resveratrol is correspondingly reduced. However, in the presence of ethylhexyl methoxycrylene, a photostabilizer used in sunscreens, the effects of UV exposure on trans-resveratrol are minimized, thereby preserving its antioxidant activity and, presumably, its bioavailability.
Sep 01, 2011 | 01:34 PM CDT
Ingredient Profile—Ascorbic Acid
By: Michael J. Fevola, PhD, Johnson & Johnson
L-Ascorbic acid (AscA), more commonly referred to as vitamin C, is best known for its vital role in human health and nutrition, where it functions as a cofactor in enzymatic reactions, such as collagen synthesis, and as an antioxidant.
Sep 01, 2011 | 01:30 PM CDT
Formula Anatomy Deciphered—Skin Lighteners
By: Eric S. Abrutyn, TPC2 Advisors Ltd.
The term “skin lightening” has been positioned in the cosmetic market to denote the return of skin’s color to a more natural transparent tone, providing a more even skin tone and lighter skin pigment. Topical skin lighteners suppress production of melanin pigment, prevent darkening of the skin or modify pigmentation such as blotches and freckles.
Aug 01, 2011 | 01:53 PM CDT
Vegetal-derived Emulsifiers for Improved Stability and Formula Efficiency
By: Luigi Rigano, Industrial Consulting and Resear…
The quest for PEG-free surfactants and emulsifiers has led to new classes of vegetal-derived, ethylene oxidefree ingredients for environmentally friendly personal care products. Two such ingredients, described here, are based on the combination of olive oil and vegetable proteins with the first derived from oat and the second, with glutamic acid. These materials provide mildness and skin protection benefits.
Aug 01, 2011 | 01:45 PM CDT
Alternative Ingredients for Sustainable Shampoo Development
By: Denis Bendejacq, PhD; Caroline Mabille, PhD; M…
In this article, several ingredients are reviewed for development of sustainable shampoo formulations. Some of the functional ingredients reviewed are plant-based alternatives to existing, petro sourced ingredients while others are mild, sulfate-free and/ or ethoxylate-free alternatives to existing surfactant systems, thickening solutions for challenging media based on naturally derived polymers and efficacy boosters that reduce the use of non-renewable actives with equal benefit for the consumer.
Aug 01, 2011 | 01:34 PM CDT
Ingredient Profile—Glycerin
By: Michael J. Fevola, PhD, Johnson & Johnson
Glycerin is a unique and versatile chemical with numerous applications; to adequately cover all of the aspects of this compound in a short column would be impossible. Therefore, this column will highlight some key facts about glycerin, but interested readers are encouraged to pursue further, more comprehensive reading on the ingredient.
Aug 01, 2011 | 01:26 PM CDT
Formula Anatomy Deciphered—Chelating Agents
By: Eric S. Abrutyn, TPC2 Advisors Ltd.
The mechanism for chelation, described as a chelate complex, is based on multiple bonding (polydentate ligand) around a single central atom.
Jul 19, 2011 | 02:37 PM CDT
Properties of Emulsions: Structure and Skin Penetration
By: Th. Förster, B. Jackwerth, W. Pittermann, W. v…
This work studied the influence of emulsion type and structure on the penetration of vitamins as cosmetic active ingredients. An emulsion of the w/o type and two different o/w emulsions were compared with an oil solution as a standard. A systematic in vitro study of penetration into the stratum corneum and the living skin was performed with the isolated perfused bovide udder skin model. The results substantiate the influence of emulsion type and stucture on the degree of penetration of water-soluble and oil-soluble vitamins into the skin.
Jul 19, 2011 | 02:25 PM CDT
Cocamidopropyl Betaine
By: B. Grüning, PhD; D. Käseborn; and H.I. Leidrei…
This paper presents the methods for producing cocamidopropyl betaine (CAPB), an important secondary surfactant in cosmetic formulations, household cleaners, dishwashing agents and technical applications. With the widespread use of CAPB, more analytical methods to determine its contetns and byproducts are needed. The authors describe the current methods to determine CAPB purity and other characteristics.
Jun 30, 2011 | 11:35 AM CDT
Determining the Keratoltic Activities of Benzoyl Peroxide, Retinoic Acid and Salicylic Acid In vivo
By: Howard I. Maibach, MD, University of Californi…
Keratolysis is the separation or loosening of the stratum corneum (SC), and is part of the natural cycle of skin renewal and regeneration. Disordered keratolysis, resulting in skin overgrowth or excessive desquamation, is responsible for various skin disorders.