Multi-element analysis and differentiation of Chilean wines using mineral composition and multivariate statistics. 2018. Cien. Inv. Agr. 45(2): 181-191. The concentration of seventeen metal elements was analyzed in 130 commercial samples of Chilean wines, using flame atomic absorption spectroscopy (AAS) and inductively coupled plasma-mass spectrometry (ICP-MS). The elements analyzed were within the usual concentration ranges previously reported in other wine regions (for example: Fe, 2.08 ± 0.99 mgL-1 ; Zn, 0.71 ± 0.44 mg L-1 ; K, 788± 219 mg L-1 ; and Na, 14.62 ± 8.6 mg L-1). When the metal content of the samples was compared among geographic areas, significant differences in the concentration of K, Na, Mn, Mg, Zn, and Cr were observed (p ≤ 0.05). Moreover, principal component and linear discriminant analyses, used to discriminate wines according to geographic area, obtained adjustments above 90% for white wines and over 70% for red wines.
There is a significant amount of arsenic species in the environment and in biological systems; however, the toxicity and possibly the carcinogenicity of ingested arsenic depend on the species and the oxidation state. Therefore, analytical methodologies and techniques that are fast and robust, that involve highly efficient separation and are powerful tools of detection are necessary for the correct quantification of individual arsenic species. The field of speciation analysis of arsenic in this area has grown rapidly in recent years, especially with the application of liquid chromatography and mass spectrometry with inductively coupled plasma. This study aimed to develop and apply this technique to human urine samples in order to reduce the treatment needed for speciation, maintain maximum recovery and avoid interconversion and / or degradation between species. In order to optimize the separation of species, several experiments were performed by preparing the mobile phase at different pH values. The optimal pH value and the linearity of the method were determined and the methodology was validated using a Certified Reference Material. Student`s t-test and Fisher F-test for determination of accuracy and precision were applied. A simple, rapid and reliable method for the separation and quantification of several species of arsenic, As III (Arsenite), As V (Arsenate), MMA (Monomethyl Arsonic Acid), DMA (Dimethyl Arsinic Acid), AB (Arsenobetaine) was developed in human urine samples with minimal prior sample preparation. The time required for sample processing and isocratic chromatographic analysis is about 15 minutes. Detection limits of 0.020 µgL -1 of AsB, 0.020 µgL -1 of As III, 0.040 µgL -1 of DMA, 0.060 µgL -1 of MMA and 0.060 µgL -1 of As V were achieved under the analytical conditions mentioned above.
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