An innovative green extraction and re-use strategy to valorize food supplement by-products: Castanea sativa bud preparations as case study

What if the leftover plant waste from your supplements could become a treasure trove of bioactive compounds? A new study turns chestnut bud by-products into valuable extracts, offering a greener alternative to burning or composting.

In the quest for sustainability, a team of Italian researchers has found a clever way to repurpose the leftovers from producing Castanea sativa glyceric macerates—a pricey botanical preparation. These buds are harvested only briefly each year, making every bit count. The researchers used pulsed ultrasound-assisted extraction to pull out additional valuable compounds from the bud by-products. They employed UV-visible spectroscopy paired with chemometrics to quickly pinpoint the best extraction conditions: an 80% duty cycle, 15 minutes of extraction, and a solvent-to-solid ratio of 1/10. Then, using HPLC, they identified and quantified the main bioactive compounds in the most promising extract, comparing it to the commercial macerate. This innovative strategy not only avoids incineration or composting but also creates value-added products. While the study focuses on chestnut buds, the approach could be applied to other herbal preparations, turning waste into worth across the industry.

Key Points

• Pulsed ultrasound extraction valorizes chestnut bud by-products.
• UV-Vis and chemometrics optimize extraction conditions quickly.
• HPLC identifies bioactive compounds in the new extract.