Objective:To screen the active fractions from purple sweet potatoes containing flavonoids with insulin resistance impro -ving ability.Methods:L6 cell model with insulin resistance was established .The extracting solutions with different polarity of purple sweet potato flavonoids were used to affect the model .The residual glucose concentration in insulin resistant L 6 cells was observed and compared before and after the intervention .Results:The residual glucose concentration of total flavonoids extracting solution , butanol extracting solution at middle and high dose , and chloroform extracting solution at all doses of purple sweet potato were lower than that of IR group (P<0.05).Conclusion:The total flavonoids extract, chloroform extracting solution and butanol extracting solution of purple sweet potato can improve insulin resistance in L 6 cells.

Objective:To investigate the effects of purple sweet potato flavonoids (PSPF)in the extracts with different polarity on the insulin resistant HepG2 (IR-HepG2) cells.Methods: PSPF in the extracts with different polarity was used to intervene the IR-HepG2 model, and the remaining glucose concentration in the IR-HepG2 group and PSPF intervention groups was compared .Results:The remaining glucose concentration in PSPF intervention group , PSPF with chloroform as the extracting solvent at high , medium and low dose of PSPF , and PSPF with butanol as the extracting solvent at high and medium dose of PSPF was obviously lower than that in the IR-HepG2 group(P<0.05).Conclusion:PSPF, the chloroform extract of PSPF and the butanol extract of PSPF can enhance the consumption of glucose in IR-HepG2 cells.