The analysis of complex mixtures presents a difficult challenge even for modern analytical techniques, and the ability to discriminate among closely similar such mixtures often remains problematic. Coffee provides a readily available archetype of such highly multicomponent systems. The use of a low-cost, sensitive colorimetric sensor array for the detection and identification of coffee aromas is reported. The color changes of the sensor array were used as a digital representation of the array response and analyzed with standard statistical methods, including principal component analysis (PCA) and hierarchical clustering analysis (HCA). PCA revealed that the sensor array has exceptionally high dimensionality with 18 dimensions required to define 90% of the total variance. In quintuplicate runs of 10 commercial coffees and controls, no confusions or errors in classification by HCA were observed in 55 trials. In addition, the effects of temperature and time in the roasting of green coffee beans were readily ...

/pdf/discrimination-of-complex-mixtures-by-a-colorimetric-sensor-54qaau0fnw.pdf

Discrimination of complex mixtures by a colorimetric sensor array: coffee aromas.

Extractive electrospray ionization mass spectrometry (EESI-MS) was applied to rapid fingerprinting of various perfumes for quality classification. Unique EESI-MS fingerprints of ten famous brands were obtained. This technique was shown to be applicable to rapid forgery detection on the example of an authentic and a counterfeit 'Miss Dior' fragrance by Christian Dior. We believe that the high throughput and simplicity of this sample-preparation-free method can be advantageous in the perfume industry, for instance when applied to online quality control.

Rapid classification of perfumes by extractive electrospray ionization mass spectrometry (EESI‐MS)

Fragrances most widely utilize in cosmetics and personal care products. These are known as allergens and emerging organic contaminants that induce the adverse effects on human health. In addition, dealers are tempted to adulterate the products by adding lower cost materials. It is therefore essential to detect fragrances in raw materials, cosmetics, and personal care products. The aim of this review is a survey of the main sample preparation and analysis methods proposed in previously published works dealing with the detection of fragrances in cosmetics and personal care products. Different sample preparation methods were utilized according to the matrix complexity e.g. dilution for the simple matrix, and headspace, direct, and tandem methods for the complex matrix. Also, different methods have been used for the analysis of fragrances in cosmetics and personal care products, investigated in four parts: chromatography, spectroscopy, mass spectrometry and electronic nose methods.

The survey of analytical methods for sample preparation and analysis of fragrances in cosmetics and personal care products

HS-GC-MS method for the analysis of fragrance allergens in complex cosmetic matrices.

Determination of suspected fragrance allergens in cosmetics by matrix solid-phase dispersion gas chromatography-mass spectrometry analysis.

The adoption of the 7th amendment of the European Cosmetic Directive 76/768/EEC requires any cosmetic product containing any of 26 raw materials identified by the Scientific Committee on Cosmetic Products and Non-Food Products intended for Consumers as likely to cause a contact allergy when present above certain trigger levels to be declared on the package label. Of these 26, 24 are volatile and can be analyzed by GC. This paper describes a method for the quantitative analysis of these volatile raw materials in perfume ingredients as well as complex perfume compositions. The method uses sequential dual-column GC-MS analysis. The full-scan data acquired minimize the false-positive and false-negative identifications that can be observed with alternate methods based on data acquired in the SIM mode. For each sample, allergen levels are determined on both columns sequentially, leading to two numerical results for each allergen. Quantification limits for each allergen in a perfume mixture based on the analysis of a standard are 0.999) and stable for multiple days. Studies on perfumes spiked with multiple allergens at 30, 50, and 70 mg/kg show recoveries close to nominal values.

Quantitative analysis of the 26 allergens for cosmetic labeling in fragrance raw materials and perfume oils.

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Quantitative analysis of the 26 allergens for cosmetic labeling in fragrance raw materials and perfume oils.