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Drying Techniques and Storage: Do They Affect the Nutritional Value of Bee-Collected Pollen?
Antonella Castagna1,2, Giovanni Benelli1, Giuseppe Conte1,2
1Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy.
Molecules (Basel, Switzerland)
|October 29, 2020
Summary
Different drying methods impact bee pollen
Area of Science:
- Food Science
- Nutritional Chemistry
- Agricultural Science
Background:
- Bee pollen is a nutrient-rich food source.
- Drying and storage can affect pollen's bioactive compounds.
- Understanding these effects is crucial for preserving pollen quality.
Purpose of the Study:
- To evaluate the impact of freeze-drying (FD), microwave-assisted drying (MWD), and hot air drying (HAD) on pollen.
- To assess the changes in polyphenols, flavonoids, and amino acids in chestnut, willow, and ivy pollen.
- To monitor chemical stability during six months of storage.
Main Methods:
- Three drying techniques (FD, MWD, HAD) were applied to chestnut, willow, and ivy pollen.
- Pollen samples were stored for three and six months.
- Chemical composition (polyphenols, flavonoids, amino acids) was analyzed using a multivariate approach.
Main Results:
- Chestnut pollen was richest in polyphenols, flavonoids, and rutin.
- Ivy pollen had the highest total and free amino acids, and proline.
- MWD best retained flavonoids in chestnut pollen; FD and MWD preserved flavonoids in ivy pollen.
- MWD maintained the highest flavonoid content in willow pollen after six months.
- FD and MWD effectively preserved amino acids during storage.
Conclusions:
- Drying and storage significantly affect bee pollen's chemical composition, with species-specific variations.
- MWD and FD are effective methods for preserving key bioactive compounds like flavonoids and amino acids in bee pollen.
- Optimal drying and storage strategies are essential for maintaining the nutritional quality of bee pollen for human consumption.
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