Optimization of extraction technology of two immune active proteins from Astragalus membranaceus var. mongholicus / 中草药

ABSTRACT

Objective: To optimize the extraction technology of immune active glycoproteins AmPR10-16kD and HQGP-2 from Astragalus membranaceus var. mongholicus (AMM). Methods: The optimized extraction temperature conditions were investigated by circular dichroism of water-soluble protein involving in AmPR10-16kD and HQGP-2 with secondary structure from AMM. The optimized extraction technology was investigated using single factor test and orthogonal test with gray value of water-soluble protein AmPR10-16kD and HQGP-2 as the index which was determined by Image of gel graphical analysis software. In this study, the effects of temperature, solid-liquid ratio, time, solvent, granularity, and times on gray value were investigated, for which the inhibitory effect of water-soluble protein was determined as an evidence by CCK-8 method, and the content of water-soluble protein is determined as an evidence by BCA method. Results: The optimized extraction technique for proteins AmPR10-16kD and HQGP-2 in AMM was established, that was 5.0 g powder of AMM over the No.4 sieve, olvent Tris-HCl, solid-liquid ratio 116 and 60 min for extraction at the temperature of 40 ℃ and being mixed under 100 r/min. The water-soluble protein extract rate in the orthogonal test analysis was 65 mg/g, of which inhibitory effect was 90.90% at a concentration of 90 μg/mL. Conclusion: The optimal extraction conditions could accurately reflect the relative amounts of AmPR10-16kD and HQGP-2 maximum extraction rate, providing a stable, reasonable, and feasible extraction process for further study of the bioactive substance of AMM.