Methods for evaluation of cosmetic antioxidant capacity

Abstract

The skin as the largest part of human body is one of the main targets for ultraviolet radiation, environmental pollution, toxic chemicals and some metal ions, which share responsibility for the formation of free radicals. The resulting free radicals, both oxygen and nitrogen species are one of the main causes of aging due to impaired regulation of cell respiratory metabolism involving incomplete oxygen reduction in mitochondria and production a superoxide anion, hydroxyl radicals et al. In modern cosmetology to minimize the adverse effects of free radicals, antioxidants, which inhibit free radical reactions, mainly autoxidation processes are used. Currently, not only many cosmetic products containing antioxidants are available, but a large diversity of methods for determination of cosmetics antioxidant activity is also accessible. These methods can be divided into three main groups: in vitro, in vivo, and ex vivo as reported herein. Due to lack of standardization and validation it is necessary to use a variety of methods as well as conditions for those purposes, which are presented to the context.

The effect of enzymatic hydrolysis on the biological properties of Oenothera biennis,Borago officinalis and Nigella sativa seedcake by‐products from oil pressing

“…Most of the plant glycosides present in the form of beta-O-glycosides at three and four carbon atom in the ring B or 5,7,8 in the ring A, rarely three in the ring C. The sugars attached to hydroxyl groups in the rings A and B limit the reduction properties of flavonoids, hence their limited ability to react with the Folin reagent and to neutralise free radicals, which specifies held as a mechanism of a hydrogen atom or an electron transfer. (Ratz-Łyko et al, 2012).…”

Naphtho-Gamma-Pyrones Produced by Aspergillus tubingensis G131: New Source of Natural Nontoxic Antioxidants

“…The evaluation of the radical scavenging potential of a given substance on cellular models might be a good requisite for eventual applications in cosmetics [39,40]. It is also good complementary information in addition to the ABTS-based antioxidant measurement.…”

Encapsulation of Olive Leaves Extracts in Biodegradable PLA Nanoparticles for Use in Cosmetic Formulation

“…Oxidative stress is one of the main factors which cause skin aging [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. For its defence, skin is equipped with enzymes and endogenous antioxidants in order to control the reactive oxygen species (ROS) in balance and repair the damage caused by them.…”