Development of a sensitive monoclonal antibody-based enzyme-linked immunosorbent assay for the antimalaria active ingredient artemisinin in the Chinese herb Artemisia annua L.
Artemisinin is an endoperoxide sesquiterpene lactone isolated from the Chinese medicinal plant Artemisia annua L. It has been widely used in South-East Asia and Africa as an effective drug against sensitive and multidrug-resistant Plasmodium falciparum malaria. A monoclonal antibody (mAb), designated as 3H2, was generated with artesunate-bovine serum albumin conjugate as the immunogen. mAb 3H2 was used to develop a highly sensitive and specific indirect competitive enzyme-linked immunosorbent assay (icELISA) for artemisinin. The concentration of analyte producing 50% of inhibition (IC(50)) and the working range of the icELISA were 1.3 and 0.2-5.8 ng/mL, respectively. The mAb 3H2 recognized the artemisinin analogs artesunate, dihydroartemisinin, and artemether with cross-reactivity of 650%, 57%, and 3%, respectively, but negligibly recognized deoxyartemisinin and the artemisinin precursors arteannuin B and artemisinic acid. The average recoveries of artemisinin fortified in A. annua samples at concentrations from 156 to 5,000 microg/g determined by icELISA ranged from 91% to 98%. The icELISA was applied for the determination of artemisinin in different wild A. annua samples and the results were confirmed by high-performance liquid chromatography (HPLC) analysis. The correlation coefficient (R(2)) between the two assays was larger than 0.99, demonstrating a good agreement between the icELISA and HPLC results. This ELISA is suitable for quality assurance of A. annua L. materials.
He
Su-Ping
SP
College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China.
Tan
Gui-Yu
GY
Li
Gang
G
Tan
Wei-Ming
WM
Nan
Tie-Gui
TG
Wang
Bao-Min
BM
Li
Zhao-Hu
ZH
Li
Qing X
QX
D000911:Antibodies, Monoclonal / Q000276:immunology*; D019306:Artemisia / Q000737:chemistry*; D037621:Artemisinins / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods* / Q000592:standards; D007106:Immune Sera; D012680:Sensitivity and Specificity
D000911:Antibodies, Monoclonal; D037621:Artemisinins; D007106:Immune Sera; C031327:artemisinin