Alternative methods for nitrate and nitrite determination
in foodstuffs have been developed more recently, including
spectroscopic determination after enzymatic reduction [15], differential
pulse voltammetry [16] and capillary electrophoresis
[17]. The use of chromatography is potentially attractive since
it is more rapid, sensitive and selective than methods based
on reduction/colorimetry [3,18,19]. A study was performed
to obtain an alternative chromatographic method to determine
residual nitrite and nitrate in foods. Limits of detection of 1 and
10 mg/kg, respectively, for nitrite and nitrate are reported [3].
Columns containing a strong anion exchanger packing material,
such as, polymethacrylate resin with a quarternary ammonium
functional group are necessary for assuring reliability, the inconvenient
is that this type of columns are expensive.
Alternative methods for nitrate and nitrite determination
in foodstuffs have been developed more recently, including
spectroscopic determination after enzymatic reduction [15], differential
pulse voltammetry [16] and capillary electrophoresis
[17]. The use of chromatography is potentially attractive since
it is more rapid, sensitive and selective than methods based
on reduction/colorimetry [3,18,19]. A study was performed
to obtain an alternative chromatographic method to determine
residual nitrite and nitrate in foods. Limits of detection of 1 and
10 mg/kg, respectively, for nitrite and nitrate are reported [3].
Columns containing a strong anion exchanger packing material,
such as, polymethacrylate resin with a quarternary ammonium
functional group are necessary for assuring reliability, the inconvenient
is that this type of columns are expensive.
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