Phenolic Compounds and Antioxidant Activity: Analytical Methods and Current Knowledge-A Review

Area of Science:

• Food Science
• Nutritional Science
• Analytical Chemistry

Background:

• Phenolic compounds are vital plant-derived antioxidants with significant health and food preservation benefits.
• Their anti-inflammatory, antimicrobial, and anti-carcinogenic properties drive research in nutrition, pharmaceuticals, and agriculture.
• Accurate assessment of antioxidant activity is essential due to oxidative stress in biological and food systems.

Purpose of the Study:

• To critically review methodologies for extracting, detecting, and quantifying phenolic compounds.
• To evaluate various analytical approaches for assessing their antioxidant activity.
• To identify challenges and propose solutions for standardized phenolic compound analysis.

Main Methods:

• Comparison of conventional (Soxhlet, maceration) and advanced extraction techniques (ultrasound-assisted, microwave-assisted, supercritical fluid extraction).
• Review of detection methods including spectrophotometric assays (DPPH, FRAP, ORAC), electrochemical sensors, and chromatography (HPLC, HPLC-MS).
• Evaluation of in vitro, in vivo, and ex vivo approaches for antioxidant activity assessment.

Main Results:

• Extraction efficiency depends on matrix, polarity, and phenolic subclass.
• Diverse detection methods offer different advantages but lack standardization.
• Variations in protocols and the chemical diversity of phenolics complicate analysis.

Conclusions:

• Standardized and integrated approaches are crucial for reliable and comparable evaluation of phenolic antioxidant activity.
• Improved methodologies will enhance research accuracy and industrial applications.
• Addressing standardization gaps is vital for advancing the understanding and utilization of phenolic compounds.