Bioactive Compounds and Antioxidant Activity in Tropical Fruits

Tropical fruits are rich sources of bioactive constituents that contribute to human health through antioxidant, anti-inflammatory and metabolic benefits. Key classes include polyphenols (flavonoids, phenolic acids, proanthocyanidins), anthocyanins, carotenoids and vitamins such as ascorbic acid. These compounds mitigate oxidative stress by scavenging reactive oxygen and nitrogen species and by modulating endogenous defence enzymes. Research has expanded beyond pulp to valorise seeds, peels and by-products, revealing high yields of phenolics and novel polysaccharides. Innovative extraction techniques—microwave-assisted, ultrasound and enzyme-assisted methods—have enhanced recovery while reducing solvent use. Encapsulation strategies using biopolymers such as zein improve thermal stability and bioaccessibility of sensitive pigments. Together, these advances support the development of functional ingredients, nutraceuticals and sustainable valorisation pathways that add value to tropical agriculture and minimise waste streams.

Research from Nature Portfolio

High mannose yields have been achieved from açaí seed mannan by sequential dilute-acid and mannanase-catalysed hydrolysis, reaching concentrations exceeding 140 g L⁻¹ and conversion efficiencies above 95 %. This work establishes foundational process parameters for transforming seed residues into fermentable sugars and prebiotic oligosaccharides, offering a route to enhance the economic viability of fruit processing. The study provides critical compositional data and scale-up considerations for integrating by-product valorisation within existing supply chains.

Research from all publishers

Comparative analysis of two açaí varieties has shown that purple and white pulps yield oils with distinct fatty-acid profiles and superior nutritional functionality indices, suggesting potential cardioprotective effects when incorporated into diets. Both oils exhibit low acidity and high thermal stability, underscoring their suitability for food and industrial applications.

A comprehensive review of açaí’s phytochemicals highlights diverse polyphenols across fruit fractions, demonstrating antioxidant, anti-inflammatory and organ-protective actions in vitro, in vivo and emerging clinical trials. The synthesis of molecular mechanisms illuminates pathways for cardiometabolic and neuroprotective applications, reinforcing açaí’s promise as a functional food.

Encapsulation of açaí polyphenol-rich extracts into electrosprayed zein particles has improved thermal resistance during sterilisation and baking and increased polyphenol recovery in simulated digestion. Encapsulation efficiencies of approximately 70 % enable retention of antioxidant capacity post-processing, paving the way for stable delivery formats in food matrices.

Bioactive Compounds and Antioxidant Activity in Tropical Fruits publication trend

The graph below shows the total number of articles in bioactive compounds and antioxidant activity in tropical fruits across all publications each year (not limited to Nature Index journals).

Technical terms

Polyphenols: Plant secondary metabolites bearing multiple phenolic groups, known for free-radical scavenging and enzyme modulation.

Anthocyanins: Water-soluble flavonoid pigments imparting red-blue hues and contributing potent antioxidant activity.

Carotenoids: Lipid-soluble pigments (e.g. β-carotene, lycopene) with antioxidant function and provitamin A activity.

ORAC Assay: In vitro Oxygen Radical Absorbance Capacity test measuring antioxidant potential against peroxyl radicals.

Mannan: A mannose-based polysaccharide abundant in certain seed residues, convertible to fermentable sugars.

Encapsulation: Technique of embedding bioactives within a carrier matrix (e.g. proteins, polymers) to enhance stability and control release.

Bioaccessibility: Proportion of a compound released from the food matrix during digestion and available for absorption in the gut.

References

1. Lipids from the purple and white açaí (Euterpe oleracea Mart) varieties: nutritional, functional, and physicochemical properties. Frontiers in Nutrition (2024).
2. Açaí (Euterpe oleracea Mart.) in Health and Disease: A Critical Review. Nutrients (2023).
3. High concentration and yield production of mannose from açaí (Euterpe oleracea Mart.) seeds via mannanase-catalyzed hydrolysis. Scientific Reports (2019).
4. Enhancing Thermal Stability and Bioaccesibility of Açaí Fruit Polyphenols through Electrohydrodynamic Encapsulation into Zein Electrosprayed Particles. Antioxidants (2019).