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A method for measuring nitrite in fresh vegetables

J Hunt1

  • 1Horticulture Research International, Wellesbourne, Warwick, UK.

Food Additives and Contaminants
|May 1, 1994
PubMed
Summary
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This study presents a reliable method for measuring nitrite in fresh vegetables, overcoming common interferences. The optimized spectrophotometric technique ensures accurate and sensitive nitrite quantification in various vegetable samples.

Area of Science:

  • Agricultural Science
  • Analytical Chemistry
  • Food Science

Background:

  • Nitrite is a common food additive and naturally occurring compound, but its accurate measurement in complex matrices like fresh vegetables can be challenging.
  • Interference from compounds such as ascorbic acid, tannins, and enzymes can affect the reliability of nitrite quantification.
  • Developing a robust method for nitrite determination is crucial for food safety and quality control.

Purpose of the Study:

  • To develop and validate a precise and sensitive method for the measurement of nitrite in fresh vegetables.
  • To minimize interference from common vegetable components and enzymes during nitrite extraction and determination.
  • To establish a reliable spectrophotometric method for routine analysis of nitrite in diverse vegetable matrices.

Main Methods:

Related Experiment Videos

  • Nitrite extraction from fresh vegetables using zinc acetate at pH 7.2-7.5 in the presence of activated carbon to mitigate interference.
  • Utilizing three types of activated carbon for enhanced interference removal during the extraction process.
  • Spectrophotometric determination of nitrite via the diazotization/coupling reaction with sulphanilamide and N(1-naphthyl)ethylenediamine at pH 1.2 +/- 0.1.

Main Results:

  • The method demonstrated high recovery rates, with an average of 89.6% for nitrite added to vegetable samples.
  • The optimized extraction and spectrophotometric conditions significantly limited interference from ascorbic acid, tannins, and nitrate reductase.
  • The method achieved a mean recovery of 35.84 micrograms of nitrite from spiked vegetable samples, with low standard deviation (2.437) and coefficient of variation (6.8%).

Conclusions:

  • The described method provides an effective and reliable means for quantifying nitrite in fresh vegetables.
  • The use of zinc acetate extraction with activated carbon, coupled with controlled spectrophotometry, enhances accuracy and sensitivity.
  • This validated method is suitable for the precise measurement of nitrite in various vegetable types, contributing to food safety assessments.