Abstract:Using citrus peel as raw material，single factor and orthogonal tests were carried out to optimize citrus peel flavonoids extraction conditions of lime water extraction method.Flavonoid extraction rate and pectin content of flavonoid extract were compared among lime water，NaOH and ethanol extraction method.The results of single factor- and orthogonal test showed that：using saturated lime water diluted four times as solvent，liquid-powder ratio 30 mL/g，90 ℃ water bath processing for 2 h，flavonoids extraction rate was the highest，reached （5.15±0.03）mg/g.The results of comparison of different extraction methods showed that，flavonoids extraction rate of lime water-extraction was approximately equal to NaOH extraction，and higher than ethanol extraction；the pectin extraction of lime water-method was a little higher than ethanol extraction，but much lower than NaOH extraction.Therefore，the lime water extraction method could not only extract the citrus peel flavonoids effectively，but also reduce the extraction rate of pectin.