Geniposide, Geniposide, the main active component in extracts of Gardenia jasminoides ELLIS., is one of the main components of Huanglian-Jiedu-Tang (HJT). This study aimed to validate an indirect competitive enzyme-linked immunosorbent assay (icELISA) based on monoclonal antibodies (mAb) against geniposide (anti-geniposide mAb), which was developed by our lab, and apply the assay to study the pharmacokinetics of geniposide in HJT in mice. Blood samples were drawn from mice at predetermined time points after oral administration of HJT in three dosages. A linear correlation was obtained for geniposide concentrations in the range from 1.17 to 37.50 µg/mL. The intra-day and inter-day precision values of the icELISA method were well within the recommended range (≤10%). The recovery rates ranged from 99.74 to 102.40%. Stability studies showed that geniposide sample solutions were intact for 12 h. The T max and mean residence time (MRT) of geniposide of the three groups were consistent with previous data. The results suggest that a reliable and effective method was established and could be applied to the study of the pharmacokinetics of geniposide in HJT.Key words geniposide; monoclonal antibody; pharmacokinetics; indirect competitive enzyme-linked immunosorbent assay; Huanglian-Jiedu-Tang; mouse Hanglian-Jiedu-Tang (HJT) is a famous traditional Chinese medicine (TCM) compound first described during the Tang Dynasty (Wai-Tai-Mi-Yao). HJT is composed of 4 Chinese herbs: Rhizoma Coptidis (Coptis chinensis FRANCH.), Radix Scutellariae (Scutellaria baicalensis GEORGI.), Cortex phellodendri (Phellodendron amurense RUPRECHT.) and Fructus Gardeniae (Gardenia jasminoides ELLIS.).1) In modern medicine, HJT is used to treat cardiovascular and cerebrovascular diseases, such as cerebral ischemia.2) Numerous recent studies have described several pharmacological characteristics of HJT, including antioxidant, [3][4][5] anti-inflammatory, 6,7) and neuroprotective activities. 8,9) Geniposide, an iridoid glycoside, is the major medical component of the Fructus Gardeniae 10) (Fig. 1). Geniposide can cross the blood-brain barrier, [11][12][13] which makes it a promising therapeutics for brain diseases. Geniposide can inhibit damage due to ischemia and limit memory impairment through its antioxidant 14) and antiinflammatory 15,16) activities. Therefore, geniposide is also one of the main components of HJT.Despite of the efficacy in indications has been proved by clinic; there are still adverse effect reports of geniposide.
17)Therefore, the effective measures for trace detecting are needed in the pharmacology studies of geniposide.Monoclonal antibodies (mAb) are immunoglobulins with high specificity and biological activity, 18) which have been extensively applied in prevention, diagnosis and treatment of diseases, detection of residues of pesticides and chloramphenicol in food samples, 19) and veterinary medicine development. The indirect competitive ELISA (icELISA), an immunological assay based on mAb, was reported to provide a valuable t...