This paper propose a method using inductively coupled plasma optical emission spectrometry (ICP OES) for the determination of Ca, K, Mg, Mn, Na, P and Zn in iron supplement used for the treatment of anemia and evaluation of the results by chemometric analysis tools, principal component analysis (PCA) and hierarchical cluster analysis (HCA). Sample preparation was performed by acid digestion using 3.0 mL of HNO 3 and 1.0 mL of H 2 O 2 (30% v/v). Limits of quantification (mg L À1 ) were 0.52 for Ca, 0.14 for K, 0.03 for Mg, 0.07 for Mn, 0.40 for Na, 0.36 for P and 0.24 for Zn, showing that the method is sensitive for the determination of elements. There is no certified reference material of ferrous supplement for evaluation of the accuracy.Thus, addition/recovery tests were performed to evaluate the accuracy of the method. The recovery values achieved varied from 89.75 to 114.97%, confirming the applicability of this method for quantification of the mentioned elements in these iron supplements. The method proposed was applied for determination of Ca, K, Mg, Mn, Na, P and Zn in seventeen iron supplement samples with different chemical composition. All results were evaluated by multivariate analysis tools, which have the ability to characterize the samples by chemical composition and the analyte content. Some samples showed higher values for some metals, indicating the importance of specific legislation also for these metals.
The Chapeu-de-couro (Echinodorus macrophyllus (Kunth) Micheli) is a native plant from Brazil, which has been mainly used in medicinal application being a potent antirheumatic and diuretic, in the production of soft drinks, and also in the ornamentation of aquariums. In this paper, the metals and metalloids for the leaves of chapeu-de-couro collected in the Paraguacu River from the city Cachoeira, Bahia State, Brazil, was determined and evaluated using multivariate analysis. The samples were digested using nitric acid and hydrogen peroxide and were analyzed using inductively coupled plasma mass spectrometry. The accuracy of the method was confirmed by analysis of a certified reference material of apple leaves, furnished by National Institute of Standard and Technology. The study involved 15 samples of the Paraguacu River. The results expressed as milligrams of element per kilogram of sample demonstrated that the concentration ranges varied: 1.39-5.27 for chromium, 44.85-165.39 for manganese, 0.55-0.84 for arsenic, 0.01-3.94 for antimony, and 0.18-0.31 for lead. The principal component analysis and hierarchical cluster analysis evidenced that the concentrations of the metals and metalloids varied according with the variations in the water of the Paraguacu.
The present study aimed to characterization microscopic and chemical of four samples of fruit flours: eggplant (Solanum melongena), banana (Musa spp), passion fruit (Passiflora spp) and grape (Vitis vinifera). For the determination of chemical composition acid digestion was via a microwave-assisted using nitric acid and hydrogen peroxide and subsequently analysed by inductively coupled plasma Optical Emission Spectrometry (ICP OES). The validation of method was evaluated by analyzing a certified reference material (CRM), Rice Flour NIST 1568a. The vitamin C contents of the sample flour were determined by the AOAC procedure. The microscopic analyzes were realized with an optical microscope Olympus SZH10 coupled to a digital camera Cannon Power Shot A460. Average mineral concentration in flour samples (in mg/100 g) were: 0.30 to 367 (Ca); 3.38 to 1666 (K); 0.16 to 216 (Mg); 0.023 to 136 (Na); 0.010 to 9.95 (Cu); 0.050 to 27.87 (Fe); 0.052 to 6.55 (Mn); 0,011 to 6,04 (Zn) and 2,9 to 70,4 (Vitamin C). The principal component analysis (PCA) showed that the variables vitamin C and Na have negative correlation with Mn and these variables contribute to discrimination of samples of banana and passion fruit flour's. Characteristic plant tissue components that compose the fruit flours were observed as well as the irregular addition of starch.
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