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Dynamic changes in flavonoid profiles and their bioactive properties during rice yellowing
Jinguang Liu1, Caiyun Tang1, Yanan Qv1
1College of Food Science and Engineering, Shandong Agricultural University, Tai'an 271018, China.
Food Chemistry
|July 21, 2025
Summary
Rice yellowing under heat stress increases beneficial flavonoids, enhancing antioxidant and antibacterial properties. This study optimizes extraction and identifies key compounds, revealing potential applications for yellowed rice.
Area of Science:
- Agricultural Science
- Biochemistry
- Food Science
Background:
- Rice yellowing under heat stress is traditionally linked to quality degradation.
- This yellowing phenomenon is associated with significant flavonoid accumulation.
Purpose of the Study:
- To optimize flavonoid extraction from yellowed rice.
- To analyze the dynamics of flavonoid accumulation during rice yellowing.
- To investigate the bioactivities and chemical profiles of flavonoids in yellowed rice.
Main Methods:
- Optimized ultrasound-assisted extraction for flavonoids.
- Analyzed total flavonoid content and bioactivities (antioxidant, antibacterial, hypoglycemic).
- Utilized metabolomics to identify and quantify major flavonoid subclasses and specific compounds.
Main Results:
- Optimized extraction yielded increased total flavonoids with yellowing.
- Flavonoids correlated with enhanced antioxidant, antibacterial (E. coli, S. aureus), and hypoglycemic activities.
- Metabolomics revealed distinct flavonoid subclass patterns (flavones, flavonols, isoflavones, anthocyanidins) in different rice varieties (Mudanjiang japonica, Xiangwanxian indica).
- Specific compounds like luteolin and pelargonidin were identified as key drivers of yellowing in Mudanjiang japonica.
- Xiangwanxian indica showed yellowing driven by qualitative flavonoid changes.
Conclusions:
- Rice yellowing under heat stress is a complex process involving significant flavonoid accumulation.
- The identified flavonoids possess notable bioactivities, suggesting potential applications for yellowed rice.
- Understanding cultivar-specific flavonoid dynamics provides insights into rice quality and stress response mechanisms.
Keywords:
Antibacterial activityDynamic changesFlavonoidsFlavonoids-targeted metabolomicsHypoglycemic activityRice yellowingMore Related Videos
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