Macroporous Adsorption Techniques for Natural Product Purification

Macroporous adsorption techniques employ synthetic polymeric resins characterised by well defined pore structures to selectively capture, enrich and purify bioactive compounds from complex natural extracts. These resins combine high surface areas, adjustable pore diameters and diverse surface chemistries to exploit physical interactions—such as van der Waals forces and hydrogen bonding—and, in some cases, weak ionic interactions. In a typical workflow, crude plant or microbial extracts are passed through a packed column of macroporous resin under optimised pH, temperature and flow‐rate conditions. Target molecules adsorb onto the resin, while impurities pass through. Subsequent elution with an appropriate solvent regenerates the resin and yields a purified fraction. The methodology is scalable, cost‐effective and compatible with food‐grade or pharmaceutical‐grade processing. Recent advances have focused on fine‐tuning resin surface functionalities, integrating online monitoring of adsorption via spectroscopy and coupling adsorption with green extraction methods—such as ultrasound or microwave assistance—to improve yield, reduce solvent usage and preserve labile compounds. Applications span from enrichment of flavonoids, anthocyanins and polyphenols to purification of terpenoids, alkaloids and glycosides, with demonstrated benefits in nutraceutical, cosmetic and pharmaceutical development.

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Macroporous Adsorption Techniques for Natural Product Purification publication trend

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Technical terms

Macroporous resin: A cross-linked polymeric adsorbent with pore diameters typically between 50 nm and 200 nm, designed to capture molecules via non-specific physical interactions.

Adsorption isotherm: A curve describing the equilibrium relationship between solute concentration in the liquid phase and the amount adsorbed on the resin at constant temperature.

Pseudo-second-order kinetics: A kinetic model assuming that the rate of adsorption is proportional to the square of the number of unoccupied sites, often indicative of chemisorption or multilayer adsorption.

Dynamic adsorption: Continuous‐flow adsorption in a packed‐bed column, enabling scale-up and real-time control of residence time and breakthrough.

Desorption: The process of eluting or releasing adsorbed target compounds from the resin, typically by changing solvent polarity, pH or ionic strength.

References

1. Adsorption and Desorption Properties of Total Flavonoids from Oil Palm (Elaeis guineensis Jacq.) Mature Leaf on Macroporous Adsorption Resins. Molecules (2020).
2. Enrichment in Antioxidant Flavonoids of Stamen Extracts from Nymphaea lotus L. Using Ultrasonic-Assisted Extraction and Macroporous Resin Adsorption. Antioxidants (2020).
3. Efficient purification of flavonoids from bamboo shoot residues of Phyllostachys edulis by macroporous resin and their hypoglycemic activity. Food Chemistry X (2022).
4. Purification and antioxidant properties of triterpenic acids from blackened jujube (Ziziphus jujuba Mill.) by macroporous resins. Food Science & Nutrition (2021).