NDLI: A Micro-Flow-Batch Analyzer Using an In-line Cadmium Sponge Microcolumn for the Photometric Determination of Nitrate and Nitrite in Dairy Samples

Content Provider	Springer Nature Link
Author	Lima, Eduardo A. Lima, Marcelo B. Andrade, Stéfani Iury E. Barreto, Inakã S. Araújo, Mário César U. Lima, Ricardo A. C. Almeida, Lucia F.
Copyright Year	2014
Abstract	In this study, a micro-flow-batch analyzer (μFBA) using an in-line cadmium reduction microcolumn for the photometric determination of nitrate and nitrite in dairy samples is described. The method is based on the Griess-Llosvay reaction and measuring of the absorbance at 540 nm using a green LED integrated into the μFBA built in the urethane-acrylate resin. Initially, the nitrite content of the dairy sample is analyzed in the mixing chamber, while the nitrate is reduced to nitrite in cadmium sponge microcolumn coupled to the microsystem. Nitrate content was calculated from the difference between nitrate plus nitrite (expressed as nitrite) and nitrite content. The analytical curve for nitrate and nitrite was linear in the work range of 10.0–100.0 μg L$^{−1}$ with a correlation coefficient of 0.992 and 0.998, respectively. The limit of detection and relative standard deviation were estimated at 0.39 μg L$^{−1}$ and <1.7 % (n = 5) for nitrite and 0.41 μg L$^{−1}$ and <1.3 % (n = 5) for nitrate. Comparing with the reference methods, no statistically significant differences were observed when applying the paired t test at a 95 % confidence level. The accuracy was assessed through recovery test (97.7 to 102.9 %). The proposed microsystem-employed in-line cadmium sponge microcolumn presented satisfactory portability, robustness, flexibility, low-cost device, and reduced chemicals consumption compared to recent methods. Thus, μFBA is potentially useful as an alternative for other automatic determinations using in-line pretreatment steps.
Starting Page	1925
Ending Page	1931
Page Count	7
File Format	PDF
ISSN	19369751
Journal	Food Analytical Methods
Volume Number	7
Issue Number	9
e-ISSN	1936976X
Language	English
Publisher	Springer US
Publisher Date	2014-03-22
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Micro-flow-batch analyzer Urethane-acrylate resin Cadmium reduction column Nitrate and nitrite Dairy samples Food Science Chemistry/Food Science Microbiology Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Safety Research Safety, Risk, Reliability and Quality Applied Microbiology and Biotechnology Food Science

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