Ingredients’ purity: efficacy and safety
Dr. Simone Gabbanini
Frequently come across in websites and articles which excessively boast the importance of purity of vegetal extracts for the efficacy of cosmetic products.
Purity of plant extracts and efficacy, what relationship?
Well, let’s clarify the topic in two points:Efficacy is associated both to the extract purity and to the used amount in formulation
- If certain extract is assayed in 60% of something, what is the remaining 40%?
- Efficacy is associated both to the extract purity and to the used amount in formulation
The first point is related to the fact that an extract 100% pure could be ideally used, but if I using one tenth of a certain ingredient in the formulation means that a less effective product (or with lesser amount of ingredient) it will obtained in comparison to the use of the same amount of the less pure extract. The real amount of the active extract in the final formulation relies on the efficacy of the product.
The second most important point is linked to safety of the cosmetic product. A botanical low-percentage pure extract will contain higher amount % of extraction solvents / not declared components in comparison to purer extract.
In the modern cosmetic, where the border with pharmaceutical sector is increasingly ambiguous (so that we usually talk about cosmeceutics that support the topic) that the functional and technical ingredients (commonly known as excipients) play a major role in activity along with the proper active ingredient.
For instance, is demonstrated by studies conducted in BeC laboratories and were published in some relevant scientific journals, that the ability of certain essential oils or fatty acids (from vegetable origin) to behave as enhancers for cutaneous absorption for some hydro- or liposoluble vitamins.
Definitely, ingredients’ purity relies on high percentage of the active ingredient: the purer is the extract, the lesser is the room for unknown ingredient and dangerous components (additives, plasticiser, solvents, dyes, etc.) in the formula.I’d like to highlight the importance of quality and purity of the extracts, oils and active ingredients to be used in cosmetic formulation in order to assure efficacy and safety, but don’t be fooled by advertising slogan which reveal meaningless at the end.
 S. Gabbanini, E. Lucchi, M. Carli, E. Berlini, A. Minghetti, L. Valgimigli, In vitro evaluation of the permeation through reconstructed human epidermis of essentials oils from cosmetic formulations, J. Pharm. Biomed. Anal. 50 (2009) 370–376.
 S. Gabbanini, R. Matera, C. Beltramini, A. Minghetti, L. Valgimigli. Analysis of in vitro release through reconstructed human epidermis and synthetic membranes of multi-vitamins from cosmetic formulations J. Pharm. Biomed. Anal. 52 (2010) 461– 467.
 L. Valgimigli, S. Gabbanini, G. Arniani, E. Lucchi. Influence of the lipid-phase composition on the trans-epidermal transfer of vitamin B6 from O/W emulsions. HPC Today, 2013, 8, 24-27.
 L. Valgimigli, S. Gabbanini, E. Berlini, E. Lucchi, C. Beltramini and Y.L. Bertarelli. Lemon (Citrus limon, Burm.f.) essential oil enhances the trans-epidermal release of lipid- (A, E) and water- (B6, C) soluble vitamins from topical emulsions in reconstructed human epidermis, International Journal of Cosmetic Science, 34 (2012) 347–356.
Cyclooxygenase, lipoxygenase and the inflammatory process
Cyclooxygenase and lipooxygenase are the two families of enzymes that are commonly involved in the inflammatory process, through a complex of reactions which is called arachidonic acid cascade. This complex of reactions develops as follows: a first enzyme, a phospholipase cleaves the phospholipids of biological membranes, releasing arachidonic acid, a polyunsaturated fatty acid with 20 carbon atoms (eicosa-5Z,8Z,11Z,14Z-tetraenoic acid ; C20:4; ω-6). The arachidonic acid is then transformed by two parallel enzymatic pathways, that is, by two families of enzymes: the cyclooxygenase which transforms it into prostaglandins and thromboxanes and the lipooxygenase which transforms it into hydroperoxides which in turn transform into leukotrienes .
There are two cyclooxygenase isoforms indicated with type 1 and type 2, briefly COX-1 and COX-2. COX-1 is the enzyme present in most cells (except red blood cells), and is constitutive, that is, it is always present. COX-2 is an inducible cyclooxygenase isoform: it is constitutively present in some organs such as brain, liver, kidney, stomach, heart and vascular system, while it can be induced (i.e. developed if necessary) following inflammatory stimuli on the skin, white blood cells and muscles.
There are various types of lipooxygenase that lead to different products, the most important in the inflammatory process is 5-lipooxygenase, 5-LOX.
Prostaglandins, Thromboxanes, and Leukotrienes
Prostaglandins, Thromboxanes, and Leukotrienes are chemical messengers or mediators, that is, molecules that bring a message to specific cells and activate or deactivate metabolic responses in these cells. They, therefore, have a function similar to hormones, only that, unlike what hormones do, the chemical message is carried only at a short distance, that is, only to the cells that are in the vicinity of the place where the mediators were produced. There are different prostaglandins, different thromboxanes and different leukotrienes that carry specific messages. In many cases these act as mediators of the inflammatory process , therefore they trigger all the events that are involved in inflammation:
– vasodilation with consequent blood supply (redness),
– increased capillary permeability with consequent fluid exudation (swelling or edema),
– stimulation of nociceptive nerve signals (pain),
– on-site recall of immune system cells that attack a possible invader (chemotactic action)
– activation of the biosynthesis of fibrous tissue to strengthen or repair the affected part (even if there is no need)
– generations of free radicals that can chemically destroy an invader (but also damage our tissues, i.e. they just “shoot in the middle”).
Prostaglandins and thromboxanes, however, also play important physiological roles in normal conditions, i.e. in the absence of inflammation. For example, they regulate the secretion of mucus that protects the walls of the stomach, they regulate the biosynthesis of cartilages and synovial fluid in the joints, they regulate vasodilation, hence the correct flow of blood in the various local districts, and more.
Triglycerides are the main components of most oils and fats. These are heavy, non-volatile and little polar molecules, insoluble in water, made up of glycerol (or glycerin) esterified with three molecules of fatty acids: therefore, it is a tri-ester of glycerin, from which the name derives. Each fatty acid contains 8 to 22 carbon atoms (commonly 16 to 18) and can be saturated, mono-unsaturated or poly-unsaturated. The size of the fatty acids and their saturation determines the physical and sensorial properties of the triglycerides, which can appear as oils (liquids at room temperature) or fats (solid or semi-solid) and can have greater or less greasiness and smoothness on the skin. Unsaturated triglycerides or with shorter fatty acids are more fluid and have greater flowability.
Fatty acids (saturated, mono-unsaturated and poly-unsaturated)
The name fatty acids is commonly used to indicate those organic acids that are found in the composition of lipids, that is, in animal and vegetable oils and fats, both in the free form and in the form of esters with glycerol (e.g. in triglycerides), or they are esterified with “fatty” alcohols, that is, long chain alcohols, to form waxes. Fatty acids are carboxylic acids (formula R-COOH) which have a long carbon chain (R), unlike common organic acids such as acetic acid and propionic acid, which have 2 or 3 carbon atoms in total, respectively. Fatty acids are defined as saturatedif they do not have double carbon-carbon bonds, (called “unsaturations”), they are defined mono-unsaturated if they have only one, they are defined mono-unsaturatedpoly-unsaturated if they have two or more double bonds (see figure). The term omega-3 (ω-3) or omega-6 (ω-3), refers to the position of the first double bond starting from the bottom of the chain of carbon atoms: if the first double bond is encountered after 3 carbon atoms the fatty acid is classified as omega-3 , if after six carbon atoms omega-6 , as shown in the figure. The most common saturated fatty acids are palmitic acid (16 carbon atoms and no double bond, C16: 0) and stearic acid (18 carbon atoms, 18: 0), the most common mono-unsaturated is the oleic acid, typical of olive oil (18 carbon atoms and 1 double bond in position 9, C18: 1; ω-9), while the most common poly-unsaturated are linoleic acid and linolenic acid, progenitors respectively omega-6 and omega-3 (see figure).
Terpenes and terpenoids
Terpenes or terpenoids are a large family of natural molecules, typically containing 10 to 30 carbon atoms, which are biosynthesized from a common “brick”, isopentenyl pyrophosphate (IPP), containing 5 carbon atoms (see figure). The discovery that the repetitive brick consists of 5 carbon atoms is relatively recent, while it was once assumed that the entire family was created by repeating a brick of 10 carbon atoms, which was called “terpene”. Therefore, the molecules with 10 carbon atoms (such as limonene, see figure) were called mono-terpenes, i.e. composed of a single brick, diterpenes those with 20 carbon atoms (e.g. the cafestol that gives the aroma to the coffee), triterpenes those with 30 carbon atoms (e.g. beta-carotene). Since molecules made from 15 carbon atoms were also found (such as bisabolol), it was thought they contained a terpene and a half, and were called sesquiterpenes (from the Latin semis = half + atque = and). Today it is known that the repetitive unit is composed of 5 carbon atoms, therefore it is easy to understand how mono-terpenes contain two (see figure), sesquiterpenes three, diterpenes four, triterpenes six.