Bee Pollen Quality: Botanical Source, Antioxidants, and Safety for Apitherapy

Jim Crocker
18th September, 2025

Bee Pollen Quality: Botanical Source, Antioxidants, and Safety for Apitherapy

Scanning Electron Microscopy (SEM) micrographs of BP samples.

Image adapted from: Rezazadeh et al. / CC BY (Source)

Key Findings

  • Iranian bee pollen samples, collected from six provinces, were primarily monofloral, originating from 23 different plant families
  • Higher levels of total phenolic content, linked to antioxidant properties, were found in samples rich in pollen from the Asteraceae, Brassicaceae, Rosaceae, and Caryophyllaceae families
  • The average microbial count met hygiene standards for human consumption, indicating good quality and safety of most samples analyzed
Bee pollen, a substance collected by honeybees from flowering plants, has long been valued for its potential health benefits. However, the composition and quality of bee pollen can vary significantly depending on its botanical source and geographical origin. A recent study conducted by researchers at Shahid Beheshti University and PMAS-Arid Agriculture University[1] aimed to characterize bee pollen samples from Iran, with the ultimate goal of establishing standardization guidelines for this product. The research team analyzed 38 bee pollen samples collected from apiaries across six Iranian provinces between January and September 2022. A key aspect of the study was identifying the plants from which the pollen originated. This was achieved using Scanning Electron Microscopy (SEM), a technique that allows for detailed visualization of pollen grain morphology, enabling botanists to classify the pollen based on its physical characteristics. The majority of samples were found to be monofloral – meaning they primarily originated from a single plant species – representing 23 different plant families. Beyond identifying the source plants, the researchers assessed the total phenolic content (TPC) of each sample. Phenolic compounds are naturally occurring plant chemicals with antioxidant properties, often linked to various health benefits. The TPC was measured using the Folin-Ciocalteu method, a standard laboratory procedure for quantifying these compounds. The study found an average TPC of 18.48 mg of gallic acid equivalents per gram (GAE/g) in methanol extracts of the bee pollen. Importantly, the study revealed a correlation between the abundance of specific plant families and the TPC levels. Samples with higher proportions of pollen from the Asteraceae, Brassicaceae, Rosaceae, and Caryophyllaceae families exhibited increased phenolic content, with Brassicaceae showing the most significant positive influence. This suggests that the botanical origin of bee pollen is a major determinant of its antioxidant capacity. The researchers also examined the microbial content of the samples, specifically the number of aerobic mesophiles – bacteria that thrive at moderate temperatures. This assessment was conducted using Plate Count Agar (PCA) to ensure the pollen met hygiene standards for human consumption, with a mean value of 23,668.12 colony-forming units per gram (CFU/g). These findings build upon previous research highlighting the medicinal properties of pollen from specific plant sources. For example, studies have demonstrated the antioxidant and DNA damage inhibition capabilities of chestnut bee pollen[2], and the anti-inflammatory effects of pine pollen[3]. The Iranian study expands on this knowledge by showing that these beneficial properties can be linked to the prevalence of certain plant families within the bee pollen itself. Furthermore, the study echoes the importance of identifying botanical origin, as shown in earlier work using neural networks to predict honey origin based on physical and chemical parameters[4]. While[4] focused on honey, the principle of linking chemical composition to plant source remains relevant, and SEM provides a direct method for achieving this with bee pollen. The water extract from Greek pollen, identified as having high proteasome activity and antioxidant properties, also contained flavonoids[5], which further supports the notion that specific plant compounds contribute to the observed biological effects. The research from Shahid Beheshti University and PMAS-Arid Agriculture University represents a crucial first step towards standardizing Iranian bee pollen, providing a foundation for quality control and ensuring consumers receive a product with consistent and predictable health benefits. The direct relationship between plant family abundance and total phenolic content will be valuable for future investigations into the therapeutic potential of Iranian bee pollen.

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References

Main Study

1) Evaluation of bee pollen by characterizing its botanical origin, total phenolic content, and microbial load for the formulation of apitherapy products

Published 17th September, 2025

https://doi.org/10.1371/journal.pone.0327480

Related Studies

2) The antioxidant properties of the chestnut bee pollen extract and its preventive action against oxidatively induced damage in DNA bases.

https://doi.org/10.1111/jfbc.12888

3) Antioxidant and antiinflammatory activity of pine pollen extract in vitro.

https://doi.org/10.1002/ptr.2525

4) Neural networks applied to discriminate botanical origin of honeys.

https://doi.org/10.1016/j.foodchem.2014.11.121

5) Chemical analysis of Greek pollen - Antioxidant, antimicrobial and proteasome activation properties.

https://doi.org/10.1186/1752-153X-5-33


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