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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Miranda, Kelber [1] ; Vieira, Alan Lima [1] ; Bechlin, Marcos Andre [1] ; Fortunato, Felipe Manfroi [1] ; Virgilio, Alex [2] ; Ferreira, Edilene Cristina [1] ; Gomes Neto, Jose Anchieta [1]
Total Authors: 7
[1] Sao Paulo State Univ, Dept Analyt Chem, POB 355, BR-14801970 Araraquara, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Chem, POB 676, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: FOOD ANALYTICAL METHODS; v. 9, n. 7, p. 1887-1894, JUL 2016.
Web of Science Citations: 4

Establishing fast, simple, low-cost, and efficient sample preparation procedures to determine elements in foodstuffs is a relevant aspect for nutritional and health purposes. For this reason, the recently proposed closed-vessel conductively heated digestion system (CHDS) was evaluated for the digestion of milk powder, chocolate powder, and soluble coffee samples aiming for Ca, Cu, Fe, K, Mg, Mn, Na, and Zn determinations by high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) and Cd, Mo, and Se determinations by inductively coupled plasma mass spectrometry with tandem configuration (ICP-MS/MS). The accuracy was evaluated by analyzing two milk certified reference materials digested by the CHDS and a microwave oven for comparison. When using the CHDS, recoveries for the analytes varied from 91 to 104 %. For microwave digestions, recoveries within the 94-109 % intervals were obtained. The method was then applied to the samples. For comparative purposes, the analytes were also determined in the samples after microwave digestion, and the results between the two digestion systems showed no differences based on a paired t test at a 95 % confidence level. Similar analytical blanks were obtained because quartz digestion tubes were used in both digestion systems. The CHDS with quartz tubes is an interesting alternative for laboratories dedicated to large-scale routine analysis because volatile elements usually found in very low concentrations in food samples such as Cd and Se can also be determined. (AU)

FAPESP's process: 14/18393-1 - Evaluation of gradient flow analysis as calibration strategy for spectroanalytical techniques with plasma source
Grantee:Alex Virgilio
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/23323-7 - Internal standard addition method using flowing gradient concentration in spectroscopic techniques
Grantee:Felipe Manfroi Fortunato
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 14/12595-1 - Evaluation of the direct solid sampling high-resolution continuum source atomic absorption spectrometry for analysis of difficult samples
Grantee:José Anchieta Gomes Neto
Support type: Regular Research Grants
FAPESP's process: 12/02891-7 - Construction and evaluation of a miniaturized closed-vessel digestion system to prepare botanical materials for elemental analysis
Grantee:Kelber dos Anjos de Miranda
Support type: Scholarships in Brazil - Post-Doctorate