Chemical Analysis of Food: Techniques and Applications by Y Pico

By Y Pico

Chemical research of meals: recommendations and purposes experiences new know-how and demanding situations in nutrition research from a number of views: a evaluate of novel applied sciences getting used in foodstuff research, an in-depth research of a number of particular methods, and an exam of the main leading edge functions and destiny traits. The ebook is based in components: the 1st describes the function of the most recent developments Read more...

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Consequently, the ellipses of different categories differ also for eccentricity and axis orientation (Geisser, 1964). By connecting the intersection points of each couple of corresponding ellipses (at the same Mahalanobis distance from the respective centroids), a quadratic delimiter is identified, which is a parabola in the bidimensional case, as represented in Fig. 13. 3. UNEQUAL CLASS MODELS (UNEQ) UNEQ is a powerful class-modeling technique, which originated in the work of Hotelling (1947) and was launched in chemometrics by Derde and Massart (1986).

2009). Regarding the elimination or minimization of unwanted systematic effects, a number of mathematical methods for signal transformation are widely employed, such as the standard normal variate (SNV) transform and derivatives. 1. , 1989). Each signal (xi) is row-centered, by subtracting I. ANALYTICAL TECHNIQUES 38 2. 7) After transformation, each signal presents mean equal to 0 and standard deviation equal to 1. SNV has the peculiarity of possibly shifting informative regions along the signal range, so that the interpretation of the results referring to the original signals should be performed with caution (Fearn, 2009).

The development and validation of a multiclass liquid chromatography tandem mass spectrometry (LCeMS/MS) procedure for the determination of veterinary drug residues in animal tissue using a QuEChERS (QUick, Easy, CHeap, Effective, Rugged and Safe) approach. Analytica Chimica Acta 637, 68e78. , 2001. Headspace extraction of alcohols into a single drop. Analyst 126, 1674e1677. , 2010. Molecularly imprinted polymers for sample preparation: a review. Analytica Chimica Acta 668, 87e99. , 2009. Ultrasonic nebulization extraction coupled with headspace single drop microextraction and gas chromatography-mass spectrometry for analysis of the essential oil in Cuminum cyminum L.

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