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Nitrate-nitrite levels in commercially processed and home processed beets and spinach.
C M Bednar1, C Kies, M Carlson
1Division of Agricultural Research, University of Nebraska, Lincoln 68583.
Summary
Home-processed beets had higher nitrate levels than commercial versions due to processing methods. Pickled and Harvard beets showed lower nitrate/nitrite content, likely from added sugar. Storage time did not impact levels in home-processed produce.
Area of Science:
- Food Science
- Agricultural Chemistry
- Nutritional Analysis
Background:
- Nitrate and nitrite are common compounds in vegetables, with potential health implications.
- Processing methods can influence the levels of these compounds in food.
- Understanding these variations is crucial for dietary recommendations and food safety.
Purpose of the Study:
- To compare nitrate and nitrite content in commercially versus home-processed beets and spinach.
- To investigate the impact of specific processing methods (e.g., pickling, freezing) on these compounds.
- To assess the effect of storage duration on nitrate and nitrite levels.
Main Methods:
- Analysis of nitrate and nitrite content using specific ion electrode technology.
- Quantification via colorimetric methods for accuracy.
- Comparison of samples from commercial and home processing, including different preparations like pickled and Harvard beets, and frozen spinach.
Main Results:
- Home-processed beets exhibited significantly higher nitrate levels compared to commercially processed ones.
- Pickled and Harvard beets displayed significantly lower nitrate/nitrite content on a dry weight basis, attributed to sucrose dilution.
- A trend towards lower nitrate content was observed in home-frozen spinach versus commercial, though not statistically significant.
- Storage duration did not significantly alter nitrate or nitrite levels in home-processed beets and spinach.
Conclusions:
- Processing methods are a key determinant of nitrate and nitrite content in beets.
- Added sugars in certain beet preparations can dilute nitrate/nitrite concentrations.
- Current home freezing and storage practices do not appear to significantly affect nitrate or nitrite levels in spinach and beets within the studied period.