Search results for "cosmetics"
showing 10 items of 81 documents
Analytical methods for the characterization and determination of nonionic surfactants in cosmetics and environmental matrices
2013
Nonionic synthetic surfactants, constituted of an assortment of classes, are common ingredients of industrial, household and body-care products. Alone or in combination with anionic surfactants, they perform a variety of functions including cleaning action, emulsification, skin conditioning, appearance and consistency modification, solubilization and dispersing agents. By far fatty alcohol ethoxylates (AEs) and alkylphenol ethoxylates (APEs) are more extensively used than any other nonionic surfactant class; however, works appearing in the literature making reference to the analysis of other nonionic surfactant classes have also been collected in this review. The production volume worldwide…
Environmentally friendly LC for the simultaneous determination of ascorbic acid and its derivatives in skin-whitening cosmetics
2008
Ascorbic acid (AA), also known as vitamin C, is a very popular skin-whitening agent used in cosmetics. However, the use of AA (and also its sodium or magnesium salts) in cosmetic products is limited owing to its labile oxidative properties. In order to avoid its early degradation, different derivatives have been designed, such as ascorbyl phosphate (APH; as magnesium or sodium salts) and ascorbyl palmitate (AP), and more recently the ascorbyl glucoside (AG). Bearing in mind that all these chemicals in skin-whitening cosmetic products must be determined in order to control the efficacy of such products, this paper focuses on developing a wide-ranging LC analytical method able to determine th…
Stir bar sorptive-dispersive microextraction mediated by magnetic nanoparticles-metal organic framework composite: Determination of N-nitrosamines in…
2019
Abstract A new analytical method based on the recently proposed stir bar sorptive-dispersive microextraction (SBSDME) technique has been developed to determine eight hazardous N-nitrosamines in cosmetic products. As previous step, a simple clean-up is carried out with hexane to remove those highly lipophilic compounds that disturb the SBSDME step. Subsequently, SBSDME is performed by using magnetic nanoparticles–metal organic framework composite, CoFe2O4/MIL-101(Fe), as sorbent to entrap the target analytes, which are later chemically desorbed and measured by liquid chromatography–tandem mass spectrometry (LC–MS/MS). The experimental variables related to the SBSDME procedure were studied to…
Ultraviolet Filters in Cosmetics
2018
Abstract UV filters are used in sunscreen cosmetics to protect skin from the sunlight. Nowadays, they are also incorporated into other daily-use cosmetics. However, many concerns about their safety have been raised, because they can be absorbed through the skin, further metabolized and eventually bioaccumulated and/or excreted. These percutaneous absorption processes may result in various adverse health effects (i.e., allergic contact dermatitis) and other more serious systemic effects, such as carcinogenic and oestrogenic activity. For this reason, UV filters as well as their maximum allowed concentrations have been regulated by the legislations in force. In this sense, analytical control …
Estudio arqueológico y arqueométrico de restos de cosméticos hallados en una píxide malacológica en Augusta Emerita (Mérida, Badajoz)
2019
En el presente artículo se da a conocer un hallazgo excepcional localizado en una de las áreas funerarias de la antigua capital de la Lusitania, Augusta Emerita. Concretamente se analizan funcional, tipológica y arqueométricamente una pixide malacológica que contenía durante el momento de su exhumación restos de su contenido. Además se aprovecha la ocasión para realizar un análisis contextual del hallazgo y se pone en relación con el fenómeno del cuidado femenino en época romana
Authenticity as a mental state: A primer
2014
Highlights Philosophy of mind offers a new philosophical foundation for authenticity. Philosophy of mind studies mental states, whose defining property is intentionality. Intentionality is an essential trait in any characterization of authenticity. Experiencing authenticity is a mental state. Authenticity’s role as a theoretical construct is strengthened and amplified.
Zīmola ietekme uz pircēju rīcību patēriņa tirgū: MÁDARA UN Bio2You salīdzinājums.
2021
Bakalaura darbu veido trīs nodaļas, kā arī ievads, secinājumi, priekšlikumi, izmantotās literatūras un avotu saraksts un pielikumi Pirmajā nodaļā autore veica pētāmā jautājuma teorētisko pamatojumu, noskaidrojot zīmola teoriju un ietekmi uz pircēju. Otrajā nodaļā autore izpētīja uzņēmumu “Madara Cosmetics” un ”B2Y” uzņēmuma darbību un salīdzināja zīmolu “MÁDARA” un “Bio2You” veidojošos elementus. Trešajā nodaļa autore veica pētījumu, kurā tika veikta aptauja un intervijas ar diviem mārketinga nozares pārstāvjiem. Nobeigumā ir izstrādāti secinājumi un sniegti priekšlikumi, izmantotās literatūras saraksts un pielikumi. Darbs sastāv no 69 lapām, 4 tabulām, 33 attēliem un 3 pielikumiem.
Determination of Phenolic Endocrine Disruptors in Cosmetics by High-Performance Liquid Chromatography Mass Spectrometry
2017
An analytical method for the simultaneous determination of bisphenol A, 4-t-octylphenol, 4-n-octylphenol, and 4-n-nonylphenol in cosmetic samples has been developed. These compounds have toxic effe...
Quality and Efficacy of Tribulus terrestris as an Ingredient for Dermatological Formulations
2013
Tribulus terrestris L. (Zygophyllaceae) is an annual plant commonly known as Puncture vine. It is dramatically gaining interest as a rich source of saponins. T. terrestris is a promising ingredient for many industries and recent patents on dermatological applications support the use of this plant for cosmetics and hygiene. Nonetheless problems arise in the selection of the material to be used. The extracts of different origins may differ substantially. Natural speciation processes normally influence ‘variations’ in wild-crafted medicinal plants. The genus Tribulus is emblematic. Taxonomic status of T. terrestris is complicated by the wide geographical distribution leading to high levels of…