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Construction and evaluation of a miniaturized closed-vessel digestion system to prepare botanical materials for elemental analysis

Grant number: 12/02891-7
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): July 01, 2012
Effective date (End): June 30, 2015
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
Principal researcher:José Anchieta Gomes Neto
Grantee:Kelber dos Anjos de Miranda
Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


The development of a miniaturized convectively heated closed-vessel digestion system that can decompose a great number of botanical samples simultaneously at slightly increased pressure can be very useful in elemental analysis by atomic spectrometry. Preliminary studies revealed that when the digestion is performed in a closed vessel without an outer metal casing in a heating block, only the bottom of the vessel is considerably heated. Therefore, the temperature of the vapor phase is lower than the temperature of the liquid phase and vapor condensation on the vessel walls takes place. Consequently, the pressure inside the vessel is reduced and a digestion tube with thinner walls can be used. As a result, the amount of time consumed in heating and cooling the samples is diminished. The aim of this Project is to develop and evaluate a closed-vessel digestion system equipped with borosilicate glass or quartz tubes without metal casings (jackets) using a mini heating block with 48 positions. The evaluation of the system will involve the digestion of botanical materials emphasizing the determination of macronutrients, micronutrients and inorganic contaminants by atomic spectrometric techniques. Accuracy and precision of the proposed method(s) will be checked by the use of certified reference materials.

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MIRANDA, KELBER; PEREIRA-FILHO, EDENIR RODRIGUES; GOMES NETO, JOSE ANCHIETA. A new closed-vessel conductively heated digestion system: fostering plant analysis by inductively coupled plasma optical emission spectroscopy. Journal of Analytical Atomic Spectrometry, v. 29, n. 5, p. 825-831, . (12/02891-7, 12/13500-9)
MIRANDA, KELBER; VIEIRA, ALAN LIMA; GOMES NETO, JOSE ANCHIETA. High-throughput sugarcane leaf analysis using a low cost closed-vessel conductively heated digestion system and inductively coupled plasma optical emission spectroscopy. ANALYTICAL METHODS, v. 6, n. 23, p. 9503-9508, . (12/02891-7)
VIEIRA, ALAN LIMA; MIRANDA, KELBER; VIRGILIO, ALEX; FERREIRA, EDILENE CRISTINA; GOMES NETO, JOSE ANCHIETA. Evaluation of an improved closed-vessel conductively heated digestion system for the analysis of raw meat samples by ICP techniques. Journal of Analytical Atomic Spectrometry, v. 33, n. 8, p. 1354-1362, . (12/02891-7)
MIRANDA, KELBER; VIEIRA, ALAN LIMA; BECHLIN, MARCOS ANDRE; FORTUNATO, FELIPE MANFROI; VIRGILIO, ALEX; FERREIRA, EDILENE CRISTINA; GOMES NETO, JOSE ANCHIETA. Determination of Ca, Cd, Cu, Fe, K, Mg, Mn, Mo, Na, Se, and Zn in Foodstuffs by Atomic Spectrometry After Sample Preparation Using a Low-Cost Closed-Vessel Conductively Heated Digestion System. FOOD ANALYTICAL METHODS, v. 9, n. 7, p. 1887-1894, . (14/18393-1, 12/02891-7, 12/23323-7, 14/12595-1)

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Filed patent(s) as a result of this research project

APERFEIÇOAMENTO EM EQUIPAMENTO PARA DIGESTÃO DE AMOSTRAS POR VIA ÚMIDA BR1020130228249 - Universidade Estadual Paulista (UNESP) ; Universidade Federal de São Carlos (UFSCAR) . José Anchieta Gomes Neto; Kelber dos Anjos de Miranda; Edenir Rodrigues Pereira Filho - September 2013, 06