Extraction Techniques for Bioactive Compounds from Annatto Seeds

Annatto seeds (Bixa orellana L.) are rich in carotenoid pigments, notably bixin and norbixin, alongside tocotrienols, polyphenols and other apocarotenoids with antioxidant and antimicrobial properties. Traditional recovery has relied on organic solvents or alkaline hydroxide solutions, which often compromise environmental sustainability and limit co-extraction of lipid-soluble nutraceuticals. Recent advances embrace green technologies to enhance yield, selectivity and bioactivity retention. Supercritical fluid extraction (SFE) using carbon dioxide under controlled temperature and pressure exploits tunable solvent properties to recover high-purity bixin and tocotrienols while minimising thermal degradation and organic waste. Biphasic solvent systems combine aqueous and oil phases to partition polar polyphenols and non-polar carotenoids in one step, often coupled with ultrasound assistance to accelerate mass transfer. Microwave and ultrasound-assisted protocols optimise energy input and reduce solvent usage, yielding extracts with preserved antioxidant capacity and antimicrobial efficacy. Life cycle assessment and techno-economic analysis guide process design for small-scale or community-based production, ensuring that extraction methods deliver environmental benefits, economic viability and product stability. Integration of green solvents, process intensification and downstream formulation—such as lipid nanoparticles or cosmetic emulsions—highlights the practical applications of annatto seed extracts in food colouring, nutraceuticals and sustainable packaging.

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Extraction Techniques for Bioactive Compounds from Annatto Seeds publication trend

The graph below shows the total number of articles in extraction techniques for bioactive compounds from annatto seeds across all publications each year (not limited to Nature Index journals).

Technical terms

Supercritical fluid extraction: A technique using CO₂ above its critical point to extract bioactive compounds with adjustable solvating power, minimising organic solvents and thermal degradation.

Biphasic solvent system: A two-phase mixture (typically oil and water) to partition compounds by polarity, enabling simultaneous recovery of polar and non-polar constituents.

Ultrasound-assisted extraction: Use of acoustic cavitation to enhance mass transfer and reduce extraction time, often paired with green solvents.

Life cycle assessment (LCA): A method to evaluate environmental impacts of a process from raw material to end-of-life, guiding sustainable design.

Bixin and Norbixin: Lipophilic and hydrophilic carotenoid pigments, respectively, responsible for the characteristic red–orange colour and antioxidant activity of annatto extracts.

References

1. Obtaining Bixin- and Tocotrienol-Rich Extracts from Peruvian Annatto Seeds Using Supercritical CO2 Extraction: Experimental and Economic Evaluation. Foods (2024).
2. Oil/Water Biphasic Solvent System for the Eco-Extraction and Cosmetic Formulation of Bixa orellana L.. Plants (2024).
3. Potential for Sustainable Production of Natural Colorants in the Tropical Forest: A Biorefinery Case of Annatto Seeds. Sustainability (2023).
4. Ultrasound‐Assisted Extraction of Bioactive Compounds from Annatto Seeds, Evaluation of Their Antimicrobial and Antioxidant Activity, and Identification of Main Compounds by LC/ESI‐MS Analysis. International Journal of Food Science (2019).
5. Optimization of the Microwave-Assisted Extraction Process of Bioactive Compounds from Annatto Seeds (Bixa orellana L.). Antioxidants (2019).
6. Green Extraction of Annatto Seed Oily Extract and Its Use as a Pharmaceutical Material for the Production of Lipid Nanoparticles. Molecules (2022).
7. Promoting Circular Economy by Leveraging Annatto Byproducts from Bixa orellana L. into Sustainable Antioxidant Food Packaging. Foods (2025).