NITRATE IN LEAFY GREEN VEGETABLES AND ESTIMATED INTAKE

Area of Science:

• Agricultural Science
• Food Science
• Nutritional Science

Background:

• Green leafy vegetables are a significant source of dietary nitrate.
• Nitrate intake can have both beneficial and detrimental health effects.
• Vegetarian diets may lead to higher nitrate exposure.

Purpose of the Study:

• To determine seasonal and locational variations in nitrate levels of common green vegetables.
• To assess the potential intake and health implications of nitrate in vegetables.
• To evaluate nitrate levels in vegetables consumed in the Republic of Croatia.

Main Methods:

• Sampling of 200 leafy green vegetables across different locations in Croatia.
• Analysis conducted during spring and autumn sampling periods.
• Quantification of nitrate using high-performance liquid chromatography (HPLC) with UV detection.

Main Results:

• Nitrate levels varied significantly by vegetable type, season, and location.
• Spring nitrate levels ranged from 603 mg/kg (cabbage) to 972 mg/kg (chard).
• Autumn nitrate levels ranged from 1,024 mg/kg (chard) to 4,354 mg/kg (arugula).

Conclusions:

• Analyzed vegetables contain substantial nitrate concentrations.
• Dietary nitrate intake from these vegetables is considered significant but acceptable.
• Findings highlight the importance of considering vegetable origin and season for nitrate content.