Biomaterial Database

[Analytical methods for nitrate and nitrite determination in foods. 3. Spectrophotometric determination of nitrate and nitrite using sulphanilic acid/1-naphylamine, and of nitrite using resorcinol/zirconium (IV) oxychloride]. 1979

K Zimmermann, and J von Lengerken

The Nitrate content of foods may be determined by means of azo-dye coupling after reduction of the nitrate with the aid of active cadmium produced in the sample solution. An easy method for determining nitrite consists in the colorimetric estimation of a coloured chelate formed from nitrite, resorcinol and zirconium(IV) oxychloride.

UI	MeSH Term	Description	Entries
D007202	Indicators and Reagents	Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant & Hackh's Chemical Dictionary, 5th ed, p301, p499)	Indicator,Reagent,Reagents,Indicators,Reagents and Indicators
D009566	Nitrates	Inorganic or organic salts and esters of nitric acid. These compounds contain the NO3- radical.	Nitrate
D009573	Nitrites	Salts of nitrous acid or compounds containing the group NO2-. The inorganic nitrites of the type MNO2 (where M	Nitrite
D012118	Resorcinols	A water-soluble crystalline benzene-1,3-diol (resorcinol) and its derivatives.	m-Dihydroxybenzenes,meta-Dihydroxybenzenes,m Dihydroxybenzenes,meta Dihydroxybenzenes
D005504	Food Analysis	Measurement and evaluation of the components of substances to be taken as FOOD.	Analysis, Food,Analyses, Food,Food Analyses
D013053	Spectrophotometry	The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
D013425	Sulfanilic Acids	Aminobenzenesulfonic acids. Organic acids that are used in the manufacture of dyes and organic chemicals and as reagents.	Aminobenzenesulfonic Acids,Anilinesulfonic Acids,Acids, Aminobenzenesulfonic,Acids, Anilinesulfonic,Acids, Sulfanilic
D015040	Zirconium	A rather rare metallic element with atomic number 40, atomic weight 91.224, and symbol Zr.
D015057	1-Naphthylamine	A suspected industrial carcinogen (and listed as such by OSHA). Its N-hydroxy metabolite is strongly carcinogenic and mutagenic.	1-Aminonaphthalene,alpha-Naphthylamine,8-Aminonaphthalene,Naphthalidine,1 Aminonaphthalene,1 Naphthylamine,8 Aminonaphthalene,alpha Naphthylamine