Quality control of cosmetic mixtures by NIR spectroscopy |
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Authors: | Marcelo Blanco Manel Alcalá Joaquim Planells Rufí Mulero |
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Institution: | (1) Departament de Química, Unitat Analítica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;(2) Development and Quality Assurance Department, Croda Spain, S.A. (Mevisa Site), Ctra Hostalric a Tossa km 1.8, 08495 Fogars de la Selva, Spain |
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Abstract: | Cosmetic preparations typically consist of mixtures of various compounds of natural origin or their derivatives. Their analysis
is made rather difficult by their usually high complexity and is utterly impossible with a single analytical method; also,
there is usually little to be gained by determining every individual component of the mixture. Rather, analyses are aimed
at ensuring a proper balance between the contents of each component and thus require the use of methods capable of delivering
global information. The combined use of near-infrared (NIR) spectroscopy and multivariate spectral processing chemometric
techniques has enabled the development of effective methods for establishing the composition of complex samples with acceptable
levels of analytical properties, such as accuracy, precision and throughput. In this work, we developed partial least squares
calibration models for the determination of each component in a cosmetic mixture, and global indices (viz. the hydroxyl value),
simply from the NIR spectrum of the sample. The models thus obtained are accurate enough for use in quality control analyses
of cosmetic preparations and provide an effective alternative to existing conventional global methods.
Experimental setup for measurement |
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Keywords: | Cosmetics Near-infrared spectroscopy Quality control Multivariate calibration |
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