ABSTRACT
Objective: To explore the optimal separation of polypeptides from Periplaneta americana by selecting appropriate macroporous resins and optimizing purification technology. Methods: Taking the index component test and inhibition experiment of tumor cells in vitro method as indexes, macroporous resins type was chosen and single factor test was adopted to evaluate some factors affecting separating technology. The elution position was analyzed by Automatic amino acid analyzer. Results: Macroporous resin HP20 had the best separating efficiency and the best purification conditions were as follows: the content in P. americana liquid 0.3 g/mL equivalent to raw material, the volume of drug 2 BV, the adsorption rate 2 BV/h, the volume of 70% ethanol as eluant 2 BV with elution rate of 2 BV/h. The recovery rate of polypeptides of elution position could reach 88.53% and the bound amino acids (polypeptides) was 55.64%. Conclusion: This technology is reasonable and feasible and has good separation effect, which could be used for enrichment and purification of antineoplastic compounds from P. americana.
ABSTRACT
OBJECTIVE: To screen the best macroporous adsorptive resin for separation and purification of flower Elaeagnus angustifolia flavonoids and to establish the purification process parameters. METHODS: Using macroporous adsorption resin adsorption rate and desorption rate as the indexes, the best resin was screened out for enriching flower Elaeagnus angustifolia flavonoids. The optimal process conditions were investigated through single factor test. RESULTS: DA201 resin showed good adsorption and separation property for Elaeagnus angustifolia flavonoids. The detailed process conditions were as follows: the ratio of diameter to height of resin column was 1:8, sample loading rate was 0.5 mL·min-1, sample concentration was 20 mg·mL-1, pH was adjusted to 4, with elution rate of 0.5 mL·min-1, the largest sample load was 4.5 BV, eluent concentration was 80% and the dosage was 12 BV. CONCLUSION: DA201 type resin, showed good purification effect for flavonoids Elaeagnus angustifolia in the defined process conditions with a yield of 85.23%. The purity of total flavonoids achieved 14.95%, which was 3 times of that by coarse extraction (4.901%). Copyright 2012 by the Chinese Pharmaceutical Association.