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Comparison of phytochemical composition and anti-hyperglycemic activity of Liubao tea from different fermentation years
Using response surface methodologies, two Liubao tea (LBT) extracts, LBT-5 and LBT-7, were optimized for different fermentation durations. Phytochemical composition analysis assessed the chemical composition and distribution of tea pigments. Their inhibitory effects on glucose-metabolic enzymes were analysed. Furthermore, an insulin-resistant (IR) cell model was constructed to study their regulation of glucose metabolism and underlying mechanism. LBT-7, aged longer, exhibited higher polyphenols and pigments. Assessments on glucose-metabolic enzymes and IR regulation confirmed LBT’s capability to enhance glucose consumption, modulate cytokines and activate the IRS-PI3K-Akt-GLUT4 pathway. Notably, LBT-7 demonstrated a stronger effect due to its higher tea pigment
Keywords
Anti-hyperglycemic activity, enzyme inhibition, Liubao tea, phytochemical composition, PI3K-Akt pathway.
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