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Published on: August 14, 2019
Pressurized liquid extraction of flavonoids from spinach
1Department of Food Science, University of Arkansas, 2650 N. Young Ave., Fayetteville, AR 72704, USA. lukeh@uark.edu
Journal of Food Science
|April 5, 2008
Summary
Pressurized liquid extraction effectively isolates spinach flavonoids using ethanol-water mixtures. Higher temperatures increase antioxidant compounds, but Maillard polymers contribute significantly to antioxidant capacity.
Area of Science:
- Food Science
- Phytochemistry
- Extraction Technology
Background:
- Spinach is a rich source of bioactive compounds, including flavonoids.
- Optimizing extraction methods is crucial for maximizing the yield and efficacy of these compounds.
- Understanding the impact of extraction parameters on antioxidant capacity is essential for food applications.
Purpose of the Study:
- To investigate the effectiveness of pressurized liquid extraction (PLE) for isolating flavonoids from spinach.
- To evaluate the influence of different solvents and temperatures on flavonoid extraction and antioxidant properties.
- To determine the contribution of different compounds to the overall antioxidant capacity of spinach extracts.
Main Methods:
- Pressurized liquid extraction (PLE) was employed using water and a 70:30 ethanol-water mixture.
- Extractions were performed across a temperature range of 50–190°C.
- Total phenolic content, antioxidant capacity (ORAC), color, and browning indices were analyzed.
Main Results:
- The 70:30 ethanol-water mixture was more effective for flavonoid extraction than water alone.
- Optimal flavonoid extraction temperatures were below 130°C for water and 150°C for the ethanolic solvent.
- Antioxidant capacity and phenolic content increased with temperature, with Maillard polymers being major contributors at higher temperatures.
Conclusions:
- PLE is a viable method for extracting flavonoids and other antioxidant compounds from spinach.
- Extraction temperature significantly influences the composition and antioxidant properties of spinach extracts.
- Sequential extraction strategies, utilizing lower temperatures for flavonoids and higher temperatures for antioxidant polymers, can optimize the generation of functional ingredients.
