Kombucha is a functional beverage produced through the fermentation of
Camellia sinensis by a symbiotic culture of bacteria and yeast (SCOBY). Incorporating cashew (
Anacardium occidentale L.) and Cajá (
Spondias mombin L.) pulps represents a value-addition strategy to mitigate the post-harvest perishability
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Kombucha is a functional beverage produced through the fermentation of
Camellia sinensis by a symbiotic culture of bacteria and yeast (SCOBY). Incorporating cashew (
Anacardium occidentale L.) and Cajá (
Spondias mombin L.) pulps represents a value-addition strategy to mitigate the post-harvest perishability of native Cerrado fruits. This study evaluated physicochemical kinetics, 21-day refrigerated shelf life, consumer acceptance, and biological effects in
Caenorhabditis elegans of flavored kombuchas. During a 9-day primary fermentation, the pH decreased to 2.95 while total acidity reached 5.38%. Following flavoring (10%
v/v pulp/juice), cashew kombucha exhibited the highest total phenolic content (4.19 mg GAE/mL) and ferric reducing power (FRAP), whereas Cajá kombucha showed superior DPPH scavenging activity (1236 µM TroloxE/mL). Refrigerated storage (4 °C) maintained high counts of viable microorganisms (>10
5 CFU/mL), though active residual fermentation induced ongoing sugar cleavage and a transient yeast proliferation peak on day 7 (8.15 log CFU/mL in Cajá kombucha). Toxicity assays using
C. elegans revealed the initial mortality (31.5–62.5%); however, adjusting the pH to near-neutrality restored high organism viability (<10% mortality), confirming that mortality was acidity-driven. In pH-adjusted media, cashew kombucha promoted a modest extension of nematode lifespan, whereas Cajá kombucha reduced lipid accumulation. Sensory testing revealed moderate consumer acceptance, with cashew kombucha achieving a higher Acceptance Index (72.92%) than Cajá (67.26%). Overall, fruit supplementation enriches the bioactive potential of green tea kombucha, provided that post-fermentation acidity is appropriately managed.
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