Search results for "cosmetics"
showing 10 items of 81 documents
Persistent lipsticks and their lip prints: new hidden evidence at the crime scene
2000
Latent lip print test results produced by permanent lipsticks are presented in this work. This cosmetic product, contrary to conventional lipsticks, does not leave visible prints and can thus be overlooked at the crime scene. As print vehicles the study used ceramics, glass, cotton fabric and paper. Lip prints were left to dwell for different periods and were later developed using aluminum powder, cobalt oxide powder and magnetic powder. The results show that identifiable lip prints can be obtained up to 30 days after being produced.
Essential Oils: Analytical Methods to Control the Quality of Perfumes
2013
Cosmetic products, including perfumes, are regulated by a single law concerning important aspects, such as composition or labeling, in order to protect public health. A revision on the regulatory aspects for fragrance chemicals in cosmetics and household products is exposed here. Quality control of both, commercial perfumes and raw materials, is important for perfume manufacturers to assure that the finished perfume is the one that was formulated. On the other hand, analytical methods are necessary to assure, for safety purposes, that there are no undesired or banned compounds present in the finished product. Methods for perfume analysis are compiled and revised with special emphasis on the…
Heavy Metals and Human Health: Possible Exposure Pathways and the Competition for Protein Binding Sites
2021
Heavy metals enter the human body through the gastrointestinal tract, skin, or via inhalation. Toxic metals have proven to be a major threat to human health, mostly because of their ability to cause membrane and DNA damage, and to perturb protein function and enzyme activity. These metals disturb native proteins’ functions by binding to free thiols or other functional groups, catalyzing the oxidation of amino acid side chains, perturbing protein folding, and/or displacing essential metal ions in enzymes. The review shows the physiological and biochemical effects of selected toxic metals interactions with proteins and enzymes. As environmental contamination by heavy metals is one of the most…
On the Difference between a-priori and observed statistical power - A comment on "statistical power and sample size calculations: A primer for pediat…
2019
Development of novel secondary raw materials from grape juice fining waste as enriched excipients for oral care products and pharmaceuticals
2023
Reduced graphene oxide-based magnetic composite for trace determination of polycyclic aromatic hydrocarbons in cosmetics by stir bar sorptive dispers…
2020
This work describes a sensitive and rapid analytical method for trace determination of polycyclic aromatic hydrocarbons (PAHs) in cosmetic samples. The proposed method is based on stir bar sorptive-dispersive microextraction (SBSDME). A magnetic composite made of CoFe2O4 magnetic nanoparticles embedded into reduced graphene oxide sheets is used as sorbent phase. After the extraction, the target analytes are desorbed in toluene and then analyzed by gas chromatography-mass spectrometry (GC-MS). The main parameters involved in the extraction procedure (i.e., composite amount, extraction time and desorption time) were evaluated and optimized to provide the best extraction efficiency. The method…
In vitro skin penetration of bronidox, bronopol and formaldehyde from cosmetics
2020
The objective was to evaluate the influence of the formulation in the in vitro transdermal absorption through pig ear skin of three preservatives, bronopol, bronidox and formaldehyde as well as the absorption of formaldehyde from bronopol and dimethyloldimethyl hydantoin (DMDM hydantoin). An aqueous solution, an O/W emulsion and a hydrogel were assayed. Bronidox and bronopol absorption depends on the formulation. The O/W emulsion was the system that least promoted absorption of bronidox while the absorption of bronopol was lower from the hydrogel. The aqueous solution provided maximal transdermal absorption of both preservatives. Moreover, the transdermal absorption of formaldehyde released…