The property of extraction solution is an important factor influencing the extraction efficiency. In the present work

the effect of the property of solution on extraction of GA was studied

which including the concentration of ethanol

ammonia and cation (M+)

pH of extraction solution

different kinds of organic solvent etc. The results show that 50%-60%(v/v) ethanol can reach high percentage extraction of GA. If 1% (v/v) ammonia solution was added into 60%(v/v) ethanol

the percentage extraction can be increased from 2.0% to 2.31%. Without ammonia

50mmol/L [M+] (M+ = K+

NH4+) was added into 60%(v/v) ethanol

percentage extraction of GA can reach about 2.26%. If pH of solution (60% ethanol) was adjust to pH=4.0

it can reach high percentage extraction. If pH of solution (60% ethanol + 50mmol [M+]

pH=6.1) was adjust tO PH=4.0

especially M+ is K+ or NH4+

it can reach almost same extraction efficiency as that of 1% ammonia solution + 60% ethanol

and the operation environment can be greatly improved.