Kombucha fortified with Cascade hops (Humulus lupulus L.): enhanced antioxidative and sensory properties.

IF 3.9 3区 生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Applied Microbiology and Biotechnology Pub Date : 2025-01-27 DOI:10.1007/s00253-024-13401-1
Maciej Ditrych, Jakub Jędrasik, Kamil Królak, Nadia Guzińska, Katarzyna Pielech-Przybylska, Sylwia Ścieszka, Mogens Larsen Andersen, Edyta Kordialik-Bogacka
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Abstract

In recent years, there has been a surge in the production of kombucha-a functional beverage obtained via microbial fermentation of tea. However, fresh, unpasteurized kombucha is sensitive to quality deterioration as a result of, among other factors, oxidation. The addition of hops seems to be promising, due to their antioxidative properties, which may improve the stability of kombucha. However, aiming at retaining the highest antioxidative properties of kombucha, it remains unclear at which stage of the production process hops should be added. The study investigated the effect of hop supplementation during kombucha production on the basic physicochemical, antioxidative, and sensory properties of kombucha. Cascade hops in the concentrations 0.5 and 2 g/L were added at the onset of tea infusion and to the fresh, unpasteurized kombucha. The addition of hops (particularly at the pre-fermentation stage of production) led to a significant decrease in radical formation in the produced kombucha measured by electron spin resonance spectroscopy (ESR), which correlated with the higher DPPH antiradical activity and the elevated bitter α-acid content. From the sensory perspective, the post-fermentation addition of hops to kombucha resulted in a significantly higher rating of the overall quality. This enhancement was directly associated with heightened bitterness, increased presence of fruity and citrusy aromas, and a simultaneous reduction in the intensities of acetic and tea-related attributes. The data presented in this study are relevant for kombucha producers, who want to deliver a sensory-novel product in combination with an improved oxidative stability. KEY POINTS: • Hop addition in kombucha production improves the antioxidative activity of the beverage. • Hop α-acids display higher antioxidative properties in kombucha than polyphenols. • Oxidative stability of kombucha fortified with hops depends on the timing of hops addition. • Hop addition enriches the taste and aroma attributes of kombucha.

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来源期刊
Applied Microbiology and Biotechnology
Applied Microbiology and Biotechnology 工程技术-生物工程与应用微生物
CiteScore
10.00
自引率
4.00%
发文量
535
审稿时长
2 months
期刊介绍: Applied Microbiology and Biotechnology focusses on prokaryotic or eukaryotic cells, relevant enzymes and proteins; applied genetics and molecular biotechnology; genomics and proteomics; applied microbial and cell physiology; environmental biotechnology; process and products and more. The journal welcomes full-length papers and mini-reviews of new and emerging products, processes and technologies.
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