Faba bean (Vicia faba L.) is an important economic crop rich in (poly)phenols. This study investigated the impact of fermentation on content, composition, biological activities, intestinal flora modulation ability of (poly)phenol-enriched extract from faba bean. The free (poly)phenols content reached a peak of 60.69 mg GAE/100 g DW on day 30. Specific biological activities of free polyphenols of faba bean paste fermented for 30 days (FP-30) were enhanced compared to that without fermentation (FP-0). DPPH and hydroxyl radical scavenging rates of FP-30 were 68.42% and 45.81%. Xanthine oxidase and α-glucosidase inhibition rates as well as cholesterol adsorption rate of FP-30 were 88.30%, 48.96%, 34.87%, respectively. Moreover, FP-0 and FP-30 increased intestinal flora diversity in mice, and FP-30 effectively improved the abundance of beneficial bacteria including Lachnospiraceae and Butyrivibrio sp. These findings provided a reference for the further applications of faba bean (poly)phenols and for optimizing the fermentation process.
Ensuring freshness in perishable foods like meat and seafood is vital for food safety. This study developed a biodegradable colorimetric film from chitosan-polyvinyl alcohol (Cs/PVA) infused with roselle anthocyanin extract (CPAR) to monitor spoilage. Among variants, CPAR-5 (5 mL extract) showed the highest pH sensitivity (ΔE = 44.69, S% = 42%) and rapid response to ammonia vapor. Characterization via UV-Vis, FTIR, and FESEM confirmed effective pigment integration and film structure. Applied to chicken, shrimp, and tilapia, CPAR-5 visually tracked spoilage in real time under ambient and cold storage, correlating with critical pH thresholds (≥6.8 for chicken, ≥7.4 for shrimp, ≥7.0 for fish). A visual card reader was developed for semi-quantitative freshness evaluation, demonstrating that CPAR-5 is a highly sensitive, robust, user-friendly, and environmentally sustainable smart indicator with strong potential for practical food safety monitoring and reduce food waste.
To systematically explore how processing regulates the volatile metabolites and flavor of Hawk Tea (Litsea coreana), this study used non-targeted volatilomics, HS-SPME-GC-MS, and multivariate analysis (including K-means clustering) to analyze four samples with varying fermentation degrees (non-fermented green, slightly fermented white, semi-fermented oolong, deeply fermented black). A total of 379 volatile metabolites were identified, with terpenoids (28.0%) and esters (18.5%) forming the "floral-fruity" aroma foundation. K-means clustering (k = 6) grouped differential volatiles into fermentation-responsive subgroups. Fermentation reduced terpenoids/aldehydes (grassy aroma) and increased esters/heterocyclic compounds (sweet/caramel aroma); semi- and deeply fermented samples had 3.4- and 2.9-fold higher total volatiles than non-fermented ones. The rOAV ≥1 identified 90 key aroma compounds (10 core compounds). Sensory evaluation showed fermentation darkened soup color (yellow-green→orange-red), shifted aroma (camphor→fruity→sweet), and reduced astringency. KEGG analysis enriched aroma-related pathways (e.g., phenylpropanoid biosynthesis). The "processing-volatile-flavor" model provides a basis for standardizing Hawk Tea processing and improving quality.

