Upcycling of Black Currant Pomace for the Production of a Fermented Beverage with Wolfiporia cocos

Summary

Researchers have developed an innovative way to turn black currant juice waste into a tasty new beverage using a special fungus. Instead of discarding the leftover pulp and skins from juice production, they fermented it with an edible fungus called Wolfiporia cocos to create a pleasant-tasting drink with honey, floral and berry flavors. This sustainable approach helps reduce food waste while creating a new product consumers might enjoy. Impacts on everyday life: – Provides a new sustainable beverage option for environmentally conscious consumers – Helps reduce food waste from juice production – Creates value from materials that would otherwise be discarded – Demonstrates how traditional waste products can be transformed into desirable foods – Shows potential for developing similar approaches with other fruit processing wastes

Background

Pomace, a side stream from black currant juice production, is typically discarded despite being rich in nutrients like protein, fiber, sugars, anthocyanins, polyphenols, and other secondary metabolites. This waste represents a potential resource that could be better utilized, especially given growing needs for sustainable food solutions. Fungi from Basidiomycota have extensive enzymatic capabilities to recycle complex nutrient mixtures, with Wolfiporia cocos showing particular promise as a biocatalyst for producing pleasant aroma compounds during fermentation.

Objective

To develop and optimize a process for producing a pleasant-tasting fermented beverage from black currant pomace using Wolfiporia cocos as the fermenting organism, including medium optimization, upscaling, and filtration steps. The study aimed to characterize the sensory properties and key flavor compounds of the final product.

Results

The fermented beverage was rated highly pleasant by sensory panels, with honey, floral and berry notes and a well-balanced sweet-sour taste. Key flavor compounds identified included linalool, geraniol, phenylacetic acid, methyl phenylacetate, eugenol, and 2-phenylethanol, all exceeding their odor thresholds. The final product contained 192 mg/L oxalic acid and 935 mg/L citric acid. Consumer acceptance was high, with an 8.0/10 rating for purchase intent.

Conclusion

The study successfully demonstrated a sustainable method to upcycle black currant pomace into a palatable fermented beverage using W. cocos. The process proved scalable and produced a unique, pleasant flavor profile. The approach shows promise for reducing waste while creating a potentially functional beverage, though further research on nutritional and health benefits is warranted.
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