From Food Waste to Functional Ingredient: Pomegranate Peel Targets Wine Applications

Pomegranate peel could find a higher-value role in beverage processing, with a new study examining the fruit by-product as a source of tannins for wine production.

The study evaluated a tannin-rich pomegranate peel extract (PPE) produced from a food-industry by-product. Pomegranate peel accounts for almost 40% of fruit weight and contains phenolic compounds, including hydrolysable tannins such as ellagitannins. The researchers describe its recovery as a circular-economy approach that could turn an agro-industrial by-product into a higher-value natural additive.

The researchers tested PPE during pre-fermentation of Sangiovese grapes, comparing it with commercial nutgall tannin, oak tannin and a no-tannin control. PPE-treated wines recorded the highest polyphenol content and showed enhanced antioxidant activity comparable to nutgall tannin.

The treatment also increased colour intensity and polymeric pigment concentration, with the researchers reporting improved long-term colour stability. Sensory evaluation found that bitterness was reduced and stabilised without affecting astringency or sourness.

For ASEAN manufacturers, the study offers a useful example of how fruit-processing residues can be investigated as sources of higher-value ingredients rather than treated solely as waste. Pomegranate juice processors could potentially explore similar valourisation pathways, while beverage producers can monitor emerging plant-derived processing aids.

However, the findings are specific to the Sangiovese wine-making conditions tested. Further work would be needed to assess commercial-scale production, economics, regulatory requirements and performance across other beverage systems. The paper does not establish commercial use in ASEAN, but it demonstrates a research pathway relevant to circular ingredient development.